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   1  <?php
   2  
   3  /*
   4      This is Textpattern
   5  
   6      Copyright 2005 by Dean Allen
   7      www.textpattern.com
   8      All rights reserved
   9  
  10      Use of this software indicates acceptance of the Textpattern license agreement 
  11  
  12  $HeadURL: http://svn.textpattern.com/releases/4.0.6/source/textpattern/include/txp_image.php $
  13  $LastChangedRevision: 2668 $
  14  
  15  */
  16  
  17      if (!defined('txpinterface')) die('txpinterface is undefined.');
  18  
  19      global $extensions;
  20      $extensions = array(0,'.gif','.jpg','.png','.swf',0,0,0,0,0,0,0,0,'.swf');
  21      define("IMPATH",$path_to_site.DS.$img_dir.DS);
  22      include txpath.'/lib/class.thumb.php';
  23  
  24      if ($event == 'image') {    
  25          require_privs('image');        
  26  
  27          if(!$step or !in_array($step, array('image_list','image_edit','image_insert','image_delete','image_replace','image_save','thumbnail_insert','image_change_pageby','thumbnail_create','thumbnail_delete'
  28          ))){
  29              image_list();
  30          } else $step();
  31      }
  32  
  33  // -------------------------------------------------------------
  34  
  35  	function image_list($message = '')
  36      {
  37          global $txpcfg, $extensions, $img_dir, $file_max_upload_size;
  38  
  39          pagetop(gTxt('images'), $message);
  40  
  41          extract($txpcfg);
  42          extract(get_prefs());
  43  
  44          extract(gpsa(array('page', 'sort', 'dir', 'crit', 'search_method')));
  45  
  46          if (!is_dir(IMPATH) or !is_writeable(IMPATH))
  47          {
  48              echo graf(
  49                  gTxt('img_dir_not_writeable', array('{imgdir}' => IMPATH))
  50              ,' id="warning"');
  51          }
  52  
  53          else
  54          {
  55              echo upload_form(gTxt('upload_image'), 'upload', 'image_insert', 'image', '', $file_max_upload_size);
  56          }
  57  
  58          $dir = ($dir == 'asc') ? 'asc' : 'desc';
  59  
  60          switch ($sort)
  61          {
  62              case 'name':
  63                  $sort_sql = 'name '.$dir;
  64              break;
  65  
  66              case 'thumbnail':
  67                  $sort_sql = 'thumbnail '.$dir.', id asc';
  68              break;
  69  
  70              case 'category':
  71                  $sort_sql = 'category '.$dir.', id asc';
  72              break;
  73  
  74              case 'date':
  75                  $sort_sql = 'date '.$dir.', id asc';
  76              break;
  77  
  78              case 'author':
  79                  $sort_sql = 'author '.$dir.', id asc';
  80              break;
  81  
  82              default:
  83                  $sort = 'id';
  84                  $sort_sql = 'id '.$dir;
  85              break;
  86          }
  87  
  88          $switch_dir = ($dir == 'desc') ? 'asc' : 'desc';
  89  
  90          $criteria = 1;
  91  
  92          if ($search_method and $crit)
  93          {
  94              $crit_escaped = doSlash($crit);
  95  
  96              $critsql = array(
  97                  'id'             => "id = '$crit_escaped'",
  98                  'name'         => "name like '%$crit_escaped%'",
  99                  'category' => "category like '%$crit_escaped%'",
 100                  'author'     => "author like '%$crit_escaped%'"
 101              );
 102  
 103              if (array_key_exists($search_method, $critsql))
 104              {
 105                  $criteria = $critsql[$search_method];
 106                  $limit = 500;
 107              }
 108  
 109              else
 110              {
 111                  $search_method = '';
 112                  $crit = '';
 113              }
 114          }
 115  
 116          else
 117          {
 118              $search_method = '';
 119              $crit = '';
 120          }
 121          $total = safe_count('txp_image', "$criteria");
 122  
 123          if ($total < 1)
 124          {
 125              if ($criteria != 1)
 126              {
 127                  echo n.image_search_form($crit, $search_method).
 128                      n.graf(gTxt('no_results_found'), ' style="text-align: center;"');
 129              }
 130  
 131              else
 132              {
 133                  echo n.graf(gTxt('no_images_recorded'), ' style="text-align: center;"');
 134              }
 135  
 136              return;
 137          }
 138  
 139          $limit = max(@$image_list_pageby, 15);
 140  
 141          list($page, $offset, $numPages) = pager($total, $limit, $page);
 142  
 143          echo image_search_form($crit, $search_method);
 144  
 145          $rs = safe_rows_start('*, unix_timestamp(date) as uDate', 'txp_image',
 146              "$criteria order by $sort_sql limit $offset, $limit
 147          ");
 148  
 149          if ($rs)
 150          {
 151              echo n.n.startTable('list').
 152                  n.tr(
 153                      column_head('ID', 'id', 'image', true, $switch_dir, $crit, $search_method, ('id' == $sort) ? $dir : '').
 154                      hCell().
 155                      column_head('date', 'date', 'image', true, $switch_dir, $crit, $search_method, ('date' == $sort) ? $dir : '').
 156                      column_head('name', 'name', 'image', true, $switch_dir, $crit, $search_method, ('name' == $sort) ? $dir : '').
 157                      column_head('thumbnail', 'thumbnail', 'image', true, $switch_dir, $crit, $search_method, ('thumbnail' == $sort) ? $dir : '').
 158                      hCell(gTxt('tags')).
 159                      column_head('image_category', 'category', 'image', true, $switch_dir, $crit, $search_method, ('category' == $sort) ? $dir : '').
 160                      column_head('author', 'author', 'image', true, $switch_dir, $crit, $search_method, ('author' == $sort) ? $dir : '').
 161                      hCell()
 162                  );
 163  
 164              while ($a = nextRow($rs))
 165              {
 166                  extract($a);
 167  
 168                  $edit_url = '?event=image'.a.'step=image_edit'.a.'id='.$id.a.'sort='.$sort.
 169                      a.'dir='.$dir.a.'page='.$page.a.'search_method='.$search_method.a.'crit='.$crit;
 170  
 171                  $name = empty($name) ? gTxt('unnamed') : htmlspecialchars($name);
 172  
 173                  if ($thumbnail) {
 174                      if ($ext != '.swf') {
 175                          $thumbnail = '<img src="'.hu.$img_dir.'/'.$id.'t'.$ext.'" alt="" />';
 176                      } else {
 177                          $thumbnail = '';
 178                      }
 179                  } else {
 180                      $thumbnail = gTxt('no');
 181                  }
 182  
 183                  if ($ext != '.swf') {
 184                      $tag_url = '?event=tag'.a.'tag_name=image'.a.'id='.$id.a.'ext='.$ext.a.'w='.$w.a.'h='.$h.a.'alt='.urlencode($alt).a.'caption='.urlencode($caption);
 185                      $tagbuilder = '<ul>'.
 186                              '<li><a target="_blank" href="'.$tag_url.a.'type=textile" onclick="popWin(this.href); return false;">Textile</a></li>'.
 187                              '<li><a target="_blank" href="'.$tag_url.a.'type=textpattern" onclick="popWin(this.href); return false;">Textpattern</a></li>'.
 188                              '<li><a target="_blank" href="'.$tag_url.a.'type=xhtml" onclick="popWin(this.href); return false;">XHTML</a></li>'.
 189                              '</ul>';
 190                  } else {
 191                      $tagbuilder = sp;
 192                  }
 193  
 194                  $category = ($category) ? '<span title="'.htmlspecialchars(fetch_category_title($category, 'image')).'">'.$category.'</span>' : '';
 195  
 196                  echo n.n.tr(
 197  
 198                      n.td($id, 20).
 199  
 200                      td(
 201                          n.'<ul>'.
 202                          n.t.'<li>'.href(gTxt('edit'), $edit_url).'</li>'.
 203                          n.t.'<li><a href="'.hu.$img_dir.'/'.$id.$ext.'">'.gTxt('view').'</a></li>'.
 204                          n.'</ul>'
 205                      , 35).
 206  
 207                      td(
 208                          gTime($uDate)
 209                      , 75).
 210  
 211                      td(
 212                          href($name, $edit_url)
 213                      , 75).
 214  
 215                      td(
 216                          href($thumbnail, $edit_url)
 217                      , 80).
 218  
 219                      td($tagbuilder, 85).
 220                      td($category, 75).
 221  
 222                      td(
 223                          '<span title="'.htmlspecialchars(get_author_name($author)).'">'.htmlspecialchars($author).'</span>'
 224                      , 75).
 225  
 226                      td(
 227                          dLink('image', 'image_delete', 'id', $id, '', '', '', false, array($page, $sort, $dir, $crit, $search_method))
 228                      , 10)
 229                  );
 230              }
 231  
 232              echo endTable().
 233  
 234              nav_form('image', $page, $numPages, $sort, $dir, $crit, $search_method).
 235  
 236              pageby_form('image', $image_list_pageby);
 237          }
 238      }
 239  
 240  // -------------------------------------------------------------
 241  
 242  	function image_search_form($crit, $method)
 243      {
 244          $methods =    array(
 245              'id'       => gTxt('ID'),
 246              'name'     => gTxt('name'),
 247              'category' => gTxt('image_category'),
 248              'author'     => gTxt('author')
 249          );
 250  
 251          return search_form('image', 'image_list', $crit, $methods, $method, 'name');
 252      }
 253  
 254  // -------------------------------------------------------------
 255  	function image_edit($message='',$id='') 
 256      {
 257          if (!$id) $id = gps('id');
 258          $id = assert_int($id);
 259          global $txpcfg,$img_dir,$file_max_upload_size;
 260  
 261          pagetop(gTxt('edit_image'),$message);
 262  
 263          extract(gpsa(array('page', 'sort', 'dir', 'crit', 'search_method')));
 264  
 265          $categories = getTree("root", "image");
 266          
 267          $rs = safe_row("*", "txp_image", "id = $id");
 268  
 269          if ($rs) {
 270              extract($rs);
 271  
 272              if ($ext != '.swf') {
 273                  $img = '<img src="'.hu.$img_dir.'/'.$id.$ext.'" height="'.$h.'" width="'.$w.'" alt="" title="'.$id.$ext.' ('.$w.' &#215; '.$h.')" />';
 274              } else {
 275                  $img = '';
 276              }
 277  
 278              if ($thumbnail and ($ext != '.swf')) {
 279                  $thumb = '<img src="'.hu.$img_dir.'/'.$id.'t'.$ext.'" alt="" />';
 280              } else {
 281                  $thumb = '';
 282              }
 283  
 284              echo startTable('list'),
 285              tr(
 286                  td(
 287                      $img.br.
 288                      upload_form(gTxt('replace_image'), 'replace_image_form', 'image_replace', 'image', $id, $file_max_upload_size, 'image-replace', '')
 289                  )
 290              ),
 291              tr(
 292                  td(
 293                      join('',
 294                          array(
 295                              ($thumbnail)
 296                              ?     startTable('image-thumbnail').
 297                                      tr(
 298                                          td($thumb).
 299                                          td(dLink('image','thumbnail_delete','id',$id))
 300                                      ).
 301                                  endTable().br
 302                              :     '',
 303                              upload_form(gTxt('upload_thumbnail'),'upload_thumbnail',
 304                                  'thumbnail_insert','image',$id,$file_max_upload_size, 'upload-thumbnail', '')
 305                          )
 306                      )
 307                  )
 308              ),
 309  
 310              (check_gd($ext))
 311              ?    thumb_ui( $id )
 312              :    '',
 313  
 314              tr(
 315                  td(
 316                      form(
 317                          graf('<label for="image-name">'.gTxt('image_name').'</label>'.br.
 318                              fInput('text', 'name', $name, 'edit', '', '', '', '', 'image-name')).
 319  
 320                          graf('<label for="image-category">'.gTxt('image_category').'</label>'.br.
 321                              treeSelectInput('category', $categories, $category, 'image-category')).
 322  
 323                          graf('<label for="alt-text">'.gTxt('alt_text').'</label>'.br.
 324                              fInput('text', 'alt', $alt, 'edit', '', '', 50, '', 'alt-text')).
 325  
 326                          graf('<label for="caption">'.gTxt('caption').'</label>'.br.
 327                              text_area('caption', '100', '400', $caption, 'caption')).
 328  
 329                          n.graf(fInput('submit', '', gTxt('save'), 'publish')).
 330                          n.hInput('id', $id).
 331                          n.eInput('image').
 332                          n.sInput('image_save').
 333  
 334                          n.hInput('sort', $sort).
 335                          n.hInput('dir', $dir).
 336                          n.hInput('page', $page).
 337                          n.hInput('search_method', $search_method).
 338                          n.hInput('crit', $crit)
 339                      )
 340                  )
 341              ),
 342              endTable();
 343          }
 344      }
 345  
 346  // -------------------------------------------------------------
 347  
 348  	function image_insert()
 349      {
 350          global $txpcfg, $extensions, $txp_user;
 351  
 352          extract($txpcfg);
 353  
 354          $meta = gpsa(array('caption', 'alt', 'category'));
 355  
 356          $img_result = image_data($_FILES['thefile'], $meta);
 357  
 358          if (is_array($img_result))
 359          {
 360              list($message, $id) = $img_result;
 361  
 362              return image_edit($message, $id);
 363          }
 364  
 365          else
 366          {
 367              return image_list($img_result);
 368          }
 369      }
 370  
 371  // -------------------------------------------------------------
 372  	function image_replace() 
 373      {    
 374          global $txpcfg,$extensions,$txp_user;
 375          extract($txpcfg);
 376              
 377          $id = assert_int(gps('id'));
 378          $rs = safe_row("*", "txp_image", "id = $id");
 379          
 380          if ($rs) {
 381              $meta = array('category' => $rs['category'], 'caption' => $rs['caption'], 'alt' => $rs['alt']);
 382          } else {
 383              $meta = '';
 384          } 
 385          
 386          $img_result = image_data($_FILES['thefile'], $meta, $id);
 387          
 388          if(is_array($img_result))
 389          {
 390              list($message, $id) = $img_result;
 391              return image_edit($message, $id);
 392          }else{
 393              return image_list($img_result);
 394          }
 395      }
 396  
 397  // -------------------------------------------------------------
 398  	function thumbnail_insert() 
 399      {
 400          global $txpcfg,$extensions,$txp_user,$img_dir,$path_to_site;
 401          extract($txpcfg);
 402          $id = assert_int(gps('id'));
 403          
 404          $file = $_FILES['thefile']['tmp_name'];
 405          $name = $_FILES['thefile']['name'];
 406  
 407          $file = get_uploaded_file($file);
 408          
 409          list(,,$extension) = getimagesize($file);
 410      
 411          if (($file !== false) && @$extensions[$extension]) {
 412              $ext = $extensions[$extension];
 413  
 414                  $newpath = IMPATH.$id.'t'.$ext;
 415              
 416              if(shift_uploaded_file($file, $newpath) == false) {
 417                  image_list($newpath.sp.gTxt('upload_dir_perms'));
 418              } else {
 419                  chmod($newpath,0644);
 420                  safe_update("txp_image", "thumbnail = 1", "id = $id");
 421  
 422                  $message = gTxt('image_uploaded', array('{name}' => $name));
 423                  update_lastmod();
 424  
 425                  image_edit($message, $id);
 426              }
 427          } else {
 428              if ($file === false)
 429                  image_list(upload_get_errormsg($_FILES['thefile']['error']));
 430              else
 431                  image_list(gTxt('only_graphic_files_allowed'));
 432          }
 433      }
 434  
 435  
 436  // -------------------------------------------------------------
 437  	function image_save() 
 438      {
 439          extract(doSlash(gpsa(array('id','name','category','caption','alt'))));
 440          $id = assert_int($id);
 441          
 442          safe_update(
 443              "txp_image",
 444              "name     = '$name',
 445              category = '$category',
 446              alt      = '$alt',
 447              caption  = '$caption'",
 448              "id = $id"
 449          );
 450  
 451          $message = gTxt('image_updated', array('{name}' => $name));
 452          update_lastmod();
 453  
 454          image_list($message);
 455      }
 456  
 457  // -------------------------------------------------------------
 458  
 459  	function image_delete() {
 460          global $txpcfg;
 461  
 462          extract($txpcfg);
 463  
 464          $id = assert_int(ps('id'));
 465  
 466          $rs = safe_row('*', 'txp_image', "id = $id");
 467  
 468          if ($rs) {
 469              extract($rs);
 470  
 471              $rsd = safe_delete('txp_image', "id = $id");
 472  
 473              $ul = false;
 474  
 475              if (is_file(IMPATH.$id.$ext)) {
 476                  $ul = unlink(IMPATH.$id.$ext);
 477              }
 478  
 479              if (is_file(IMPATH.$id.'t'.$ext)) {
 480                  $ult = unlink(IMPATH.$id.'t'.$ext);
 481              }
 482  
 483              if ($rsd && $ul) {
 484                  update_lastmod();
 485  
 486                  image_list(gTxt('image_deleted', array('{name}' => $name)));
 487              } else {
 488                  image_list(gTxt('image_delete_failed', array('{name}' => $name)));
 489              }
 490          } else {
 491              image_list();
 492          }
 493      }
 494  
 495  // -------------------------------------------------------------
 496  	function image_change_pageby()
 497      {
 498          event_change_pageby('image');
 499          image_list();
 500      }
 501  
 502  // -------------------------------------------------------------
 503  	function thumb_ui($id)
 504      {        
 505          global $prefs, $sort, $dir, $page, $search_method, $crit;
 506          extract($prefs);
 507          return
 508          tr(
 509              td(
 510                  form(
 511                      graf(gTxt('create_thumbnail')) .
 512                      startTable('','left','',1) .
 513                          tr(
 514                              fLabelCell(gTxt('thumb_width'), '', 'width') . 
 515                              fInputCell('width', @$thumb_w, 1, 4, '', 'width').
 516  
 517                              fLabelCell(gTxt('thumb_height'), '', 'height') . 
 518                              fInputCell('height', @$thumb_h, 1, 4, '', 'height').
 519  
 520                              fLabelCell(gTxt('keep_square_pixels'), '', 'crop') . 
 521                              tda(checkbox('crop', 1, @$thumb_crop, '', 'crop'), ' class="noline"').
 522  
 523                              tda(
 524                                  fInput('submit', '', gTxt('Create'), 'smallerbox')
 525                              , ' class="noline"')
 526                          ).
 527  
 528                          n.hInput('id', $id).
 529                          n.eInput('image').
 530                          n.sInput('thumbnail_create').
 531  
 532                          n.hInput('sort', $sort).
 533                          n.hInput('dir', $dir).
 534                          n.hInput('page', $page).
 535                          n.hInput('search_method', $search_method).
 536                          n.hInput('crit', $crit).
 537  
 538                      endTable()
 539                  )
 540              )
 541          );
 542      }
 543  
 544  // -------------------------------------------------------------
 545  
 546  	function thumbnail_create()
 547      {
 548          extract(doSlash(gpsa(array('id', 'width', 'height'))));
 549  
 550          // better checking of thumbnail dimensions
 551          // don't try and use zeros
 552  
 553          $width = (int) $width;
 554          $height = (int) $height;
 555  
 556          if ($width == 0 && $height == 0) {
 557              image_edit(messenger('invalid_width_or_height', "($width)/($height)", ''), $id);
 558              return;
 559          } else {
 560              if ($width == 0) {
 561                  $width = '';
 562              }
 563  
 564              if ($height == 0) {
 565                  $height = '';
 566              }
 567          }
 568  
 569          $crop = gps('crop');
 570  
 571          $t = new txp_thumb( $id );
 572          $t->crop = ($crop == '1');
 573          $t->hint = '0';
 574  
 575          $t->width = $width;
 576          $t->height = $height;
 577  
 578          if ($t->write())
 579          {
 580              global $prefs;
 581  
 582              $prefs['thumb_w'] = $width;
 583              $prefs['thumb_h'] = $height;
 584              $prefs['thumb_crop'] = $crop;
 585  
 586              // hidden prefs
 587              set_pref('thumb_w', $width, 'image',    2);
 588              set_pref('thumb_h', $height, 'image',     2);
 589              set_pref('thumb_crop', $crop, 'image',    2);
 590  
 591              $message = gTxt('thumbnail_saved', array('{id}' => $id));
 592              update_lastmod();
 593  
 594              image_edit($message, $id);
 595          }
 596  
 597          else
 598          {
 599              $message = gTxt('thumbnail_not_saved', array('{id}' => $id));
 600  
 601              image_edit($message, $id);
 602          }
 603      }
 604  
 605  // -------------------------------------------------------------
 606  	function thumbnail_delete() 
 607      {
 608          $id = assert_int(gps('id'));
 609          $t = new txp_thumb($id);
 610          if ($t->delete()) {
 611              image_edit(gTxt('thumbnail_deleted'),$id);
 612          } else {
 613              image_edit(gTxt('thumbnail_delete_failed'),$id);
 614          }
 615      }
 616  
 617  // -------------------------------------------------------------
 618  // Refactoring attempt, allowing other - plugin - functions to
 619  // upload images without the need for writting duplicated code.
 620  
 621  	function image_data($file , $meta = '', $id = '', $uploaded = true)
 622      {
 623          global $txpcfg, $extensions, $txp_user, $prefs, $file_max_upload_size;
 624  
 625          extract($txpcfg);
 626  
 627          $name = $file['name'];
 628          $error = $file['error'];
 629          $file = $file['tmp_name'];
 630  
 631          if ($uploaded)
 632          {
 633              $file = get_uploaded_file($file);
 634  
 635              if ($file_max_upload_size < filesize($file))
 636              {
 637                  unlink($file);
 638  
 639                  return upload_get_errormsg(UPLOAD_ERR_FORM_SIZE);
 640              }
 641          }
 642  
 643          list($w, $h, $extension) = getimagesize($file);
 644  
 645          if (($file !== false) && @$extensions[$extension])
 646          {
 647              $ext = $extensions[$extension];
 648  
 649              $name = doSlash(substr($name, 0, strrpos($name, '.')).$ext);
 650  
 651              if ($meta == false)
 652              {
 653                  $meta = array('category' => '', 'caption' => '', 'alt' => '');
 654              }
 655  
 656              extract(doSlash($meta));
 657  
 658              $q ="
 659                  name = '$name',
 660                  ext = '$ext',
 661                  w = $w,
 662                  h = $h,
 663                  alt = '$alt',
 664                  caption = '$caption',
 665                  category = '$category',
 666                  date = now(),
 667                  author = '$txp_user'
 668              ";
 669  
 670              if (empty($id))
 671              {
 672                  $rs = safe_insert('txp_image', $q);
 673  
 674                  $id = $GLOBALS['ID'] = mysql_insert_id();
 675              }
 676  
 677              else
 678              {
 679                  $id = assert_int($id);
 680  
 681                  $rs = safe_update('txp_image', $q, "id = $id");
 682              }
 683  
 684              if (!$rs)
 685              {
 686                  return gTxt('image_save_error');
 687              }
 688  
 689              else
 690              {
 691                  $newpath = IMPATH.$id.$ext;
 692  
 693                  if (shift_uploaded_file($file, $newpath) == false)
 694                  {
 695                      $id = assert_int($id);
 696  
 697                      safe_delete('txp_image', "id = $id");
 698  
 699                      safe_alter('txp_image', "auto_increment = $id");
 700  
 701                      if (isset($GLOBALS['ID']))
 702                      {
 703                          unset( $GLOBALS['ID']);
 704                      }
 705  
 706                      return $newpath.sp.gTxt('upload_dir_perms');
 707                  }
 708  
 709                  else
 710                  {
 711                      @chmod($newpath, 0644);
 712  
 713                      // GD is supported
 714                      if (check_gd($ext))
 715                      {
 716                          // Auto-generate a thumbnail using the last settings
 717                          if (isset($prefs['thumb_w'], $prefs['thumb_h'], $prefs['thumb_crop']))
 718                          {
 719                              $width  = intval($prefs['thumb_w']);
 720                              $height = intval($prefs['thumb_h']);
 721  
 722                              if ($width > 0 or $height > 0)
 723                              {
 724                                  $t = new txp_thumb( $id );
 725  
 726                                  $t->crop = ($prefs['thumb_crop'] == '1');
 727                                  $t->hint = '0';
 728                                  $t->width = $width;
 729                                  $t->height = $height;
 730  
 731                                  $t->write();
 732                              }
 733                          }
 734                      }
 735  
 736                      $message = gTxt('image_uploaded', array('{name}' => $name));
 737                      update_lastmod();
 738  
 739                      return array($message, $id);
 740                  }
 741              }
 742          }
 743  
 744          else
 745          {
 746              if ($file === false)
 747              {
 748                  return upload_get_errormsg($error);
 749              }
 750  
 751              else
 752              {
 753                  return gTxt('only_graphic_files_allowed');
 754              }
 755          }
 756      }
 757  
 758  // -------------------------------------------------------------
 759  // check GD info
 760  
 761  	function check_gd($image_type) {
 762          // GD is installed
 763          if (function_exists('gd_info')) {
 764              $gd_info = gd_info();
 765  
 766              switch ($image_type) {
 767                  // check gif support
 768                  case '.gif':
 769                      return ($gd_info['GIF Create Support'] == 1) ? true : false;
 770                  break;
 771  
 772                  // check png support
 773                  case '.png':
 774                      return ($gd_info['PNG Support'] == 1) ? true : false;
 775                  break;
 776  
 777                  // check jpg support
 778                  case '.jpg':
 779                      return ($gd_info['JPG Support'] == 1) ? true : false;
 780                  break;
 781  
 782                  // unsupported format
 783                  default:
 784                      return false;
 785                  break;
 786              }
 787          } else { // GD isn't installed
 788              return false;
 789          }
 790      }
 791  
 792  ?>