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  1. <?php
  2.  
  3. class ImageResampler {
  4.    function createThumbnail ($image_file, $tn_file, $max_width, $max_height = 0, $what2do = 'TN', $output_format = '') {
  5.  
  6.        if (!file_exists ($image_file)) return;
  7.        if (!$tn_file) return;
  8.  
  9.        $image_file_ext = ''; if (strrpos ($image_file, '.')) $image_file_ext = substr ($image_file, strrpos ($image_file, '.'));
  10.        $tn_file_ext = ''; if (strrpos ($tn_file, '.')) $tn_file_ext = substr ($tn_file, strrpos ($tn_file, '.'));
  11.  
  12.        $img_picture = '';
  13.        if ($image_file_ext == '.jpg') $img_picture = imageCreateFromJPEG ($image_file);
  14.        if ($image_file_ext == '.png') $img_picture = imageCreateFromPNG ($image_file);
  15.        if ($image_file_ext == '.gif') $img_picture = imageCreateFromGIF ($image_file);
  16.        if (!$img_picture) return;
  17.  
  18.        $size = getImageSize ($image_file);
  19.        if (!is_array ($size)) return;
  20.  
  21.        $width = $size[0]; if (!$width) return;
  22.        $height = $size[1]; if (!$height) return;
  23.  
  24.        /* * */
  25.  
  26.        if (!$max_height) $max_height = $max_width * 1024;
  27.  
  28.        $required_width = $width;
  29.        $required_height = $height;
  30.  
  31.        for ($zoom = 0; $zoom <= 1000; $zoom ++) {
  32.             if ($required_width <= $max_width &&
  33.                 $required_height <= $max_height) break;
  34.  
  35.             if ($zoom == 0) {
  36.                 $required_width = (int) ($width / 3 * 2);
  37.                 $required_height = (int) ($height / 3 * 2);
  38.             } else {
  39.                 $required_width = (int) ($width / $zoom);
  40.                 $required_height = (int) ($height / $zoom);
  41.             }
  42.        }
  43.        unset ($zoom);
  44.  
  45.        if ($what2do == 'IMG' && $required_width == $width) return;
  46.  
  47.        $img_resampled = imageCreateTrueColor ($required_width, $required_height);
  48.        imageCopyResampled ($img_resampled, $img_picture, 0, 0, 0, 0, $required_width, $required_height, $width, $height);
  49.  
  50.        if (file_exists ($tn_file)) unlink ($tn_file);
  51.  
  52.        if ($output_format && $output_format == 'PNG') {
  53.            $tn_file = strreplace ($tn_file, $tn_file_ext, '.png');
  54.  
  55.            imagePNG ($img_resampled, $tn_file);
  56.        } else {
  57.            $quality = 1;
  58.            if ($what2do == 'TN') $quality = 75;
  59.            if ($what2do == 'IMG') $quality = 95;
  60.  
  61.            $tn_file = strreplace ($tn_file, $tn_file_ext, '.jpg');
  62.  
  63.            imageJPEG ($img_resampled, $tn_file, $quality);
  64.        }
  65.  
  66.        /* * */
  67.  
  68.        imageDestroy ($img_resampled); unset ($img_resampled);
  69.        imageDestroy ($img_picture); unset ($img_picture);
  70.    }
  71. }
Success #stdin #stdout 0.02s 52472KB
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https://ideone.com/VzO614
language:
PHP (php 7.3.5)
created:
8 years ago
visibility:
public

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