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Filename : fix_images.php
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<?php
// Tukar semua attachment PNG-berat kepada JPEG sebenar + regenerate saiz. Run: wp eval-file fix_images.php
if (!defined('WP_CLI')) { echo "Run via wp eval-file\n"; return; }
require_once ABSPATH . 'wp-admin/includes/image.php';

$atts = get_posts(array('post_type'=>'attachment','numberposts'=>-1,'post_status'=>'any'));
$done = 0; $skip = 0; $fail = 0;
foreach ($atts as $att) {
  $file = get_attached_file($att->ID);
  if (!$file || !file_exists($file)) { $skip++; continue; }
  $info = @getimagesize($file);
  if (!$info) { $skip++; continue; }
  $isPng = ($info['mime'] === 'image/png');
  $big = filesize($file) > 400 * 1024;
  if (!$isPng && !$big) { $skip++; continue; }

  // padam saiz lama (png bersaiz)
  $meta = wp_get_attachment_metadata($att->ID);
  if (!empty($meta['sizes'])) {
    $dir = dirname($file);
    foreach ($meta['sizes'] as $s) { if (!empty($s['file'])) @unlink($dir . '/' . $s['file']); }
  }
  $im = @imagecreatefromstring(file_get_contents($file));
  if (!$im) { $fail++; continue; }
  $w = imagesx($im);
  if ($w > 1600) { $im2 = imagescale($im, 1600, -1); imagedestroy($im); $im = $im2; }
  imagejpeg($im, $file, 82);
  imagedestroy($im);
  wp_update_post(array('ID'=>$att->ID, 'post_mime_type'=>'image/jpeg'));
  $new = wp_generate_attachment_metadata($att->ID, $file);
  if ($new) wp_update_attachment_metadata($att->ID, $new);
  WP_CLI::log(basename($file) . ' -> ' . intval(filesize($file)/1024) . 'KB');
  $done++;
}
WP_CLI::success("Dioptimum: $done, skip: $skip, gagal: $fail");