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  1. <?php
  2. /**
  3.  *  Уменьшение изображений до заданного размера.
  4.  */
  5.  
  6. class ImageResampler {
  7.    public function createThumbnail ($image_file, $tn_file, $max_width, $max_height = 0, $what2do = 'TN', $output_format = '') {
  8.  
  9.        if (!file_exists ($image_file)) return;
  10.        if (!$tn_file) return;
  11.  
  12.        $image_file_ext = ''; if (strrpos ($image_file, '.')) $image_file_ext = substr ($image_file, strrpos ($image_file, '.'));
  13.        $tn_file_ext = ''; if (strrpos ($tn_file, '.')) $tn_file_ext = substr ($tn_file, strrpos ($tn_file, '.'));
  14.  
  15.        $img_picture = '';
  16.        if ($image_file_ext == '.jpg') $img_picture = imageCreateFromJPEG ($image_file);
  17.        if ($image_file_ext == '.png') $img_picture = imageCreateFromPNG ($image_file);
  18.        if ($image_file_ext == '.gif') $img_picture = imageCreateFromGIF ($image_file);
  19.        if (!$img_picture) return;
  20.  
  21.        $size = getImageSize ($image_file);
  22.        if (!is_array ($size)) return;
  23.  
  24.        $width = $size[0]; if (!$width) return;
  25.        $height = $size[1]; if (!$height) return;
  26.  
  27.        /* * */
  28.  
  29.        if (!$max_height) $max_height = $max_width * 1024;
  30.  
  31.        $required_width = $width;
  32.        $required_height = $height;
  33.  
  34.        for ($zoom = 0; $zoom <= 1000; $zoom ++) {
  35.             if ($required_width <= $max_width &&
  36.                 $required_height <= $max_height) break;
  37.  
  38.             if ($zoom == 0) {
  39.                 $required_width = (int) ($width / 3 * 2);
  40.                 $required_height = (int) ($height / 3 * 2);
  41.             } else {
  42.                 $required_width = (int) ($width / $zoom);
  43.                 $required_height = (int) ($height / $zoom);
  44.             }
  45.        }
  46.        unset ($zoom);
  47.  
  48.        if ($what2do == 'IMG' && $required_width == $width) return;
  49.  
  50.        $img_resampled = imageCreateTrueColor ($required_width, $required_height);
  51.        imageCopyResampled ($img_resampled, $img_picture, 0, 0, 0, 0, $required_width, $required_height, $width, $height);
  52.  
  53.        if (file_exists ($tn_file)) unlink ($tn_file);
  54.  
  55.        if ($output_format && $output_format == 'PNG') {
  56.            $tn_file = strreplace ($tn_file, $tn_file_ext, '.png');
  57.  
  58.            imagePNG ($img_resampled, $tn_file);
  59.        } else {
  60.            $quality = 1;
  61.            if ($what2do == 'TN') $quality = 75;
  62.            if ($what2do == 'IMG') $quality = 95;
  63.  
  64.            $tn_file = strreplace ($tn_file, $tn_file_ext, '.jpg');
  65.  
  66.            imageJPEG ($img_resampled, $tn_file, $quality);
  67.        }
  68.  
  69.        /* * */
  70.  
  71.        imageDestroy ($img_resampled); unset ($img_resampled);
  72.        imageDestroy ($img_picture); unset ($img_picture);
  73.    }
  74. }
  75. ?>
Success #stdin #stdout 0s 82880KB
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https://ideone.com/NuOA7T
language:
PHP (php 7.3.5)
created:
6 years ago
visibility:
public

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