php - A script to rewrite all images that are a certain width in a different size? -


i using gd library php.

basically, i've made design change , need resize whole bunch of images width.

ie 876px wide needs 828px.

is there way loop through jpg files in directory, check width dimension, , if equal x grab existing file name, rescale down same name?

just need use imagecopyresampled() in loop.

$path = "/my/path/to/jpgs"; $targetwidth = 876; $newwidth = 828; $imagequality = 95;  if (is_dir($path)) {     $dhandle = opendir($path);     if ($dhandle) {         while (($cfilename = readdir($dhandle)) !== false) {             if (!preg_match("/\.jpg$/", $cfilename)) {                 continue;             }              $cimagepath = $path . $cfilename;             list ($cwidth, $cheight) = getimagesize($cimagepath);              if ($cwidth == $targetwidth) {                 $cimage = imagecreatefromjpeg($cimagepath);                 if ($cimage === false) {                     echo "error reading: " . $cimagepath . "\n";                     continue;                 }                  $cnewheight = round($cheight * ($newwidth / $cwidth));                  $cnewimage = imagecreatetruecolor($newwidth, $cnewheight);                 imagecopyresampled($cnewimage, $cimage, 0, 0, 0, 0, $newwidth, $cnewheight, $cwidth, $cheight);                  if (imagejpeg($cnewimage, $cimagepath, $imagequality) === false) {                     echo "error writing: " . $cimagepath . "\n";                     continue;                 }             }         }          closedir($dhandle);     } }

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