PHP batch compression of images in the server

Copy and paste this entire paragraph to execute.

cat > /www/wwwroot/blog2.1.4s5.cn/compress.php << 'EOF'
<?php
/**
 * WebP 图片批量压缩脚本
 */

// ---- 加大内存 ----
ini_set('memory_limit', '512M');
set_time_limit(0);

$dir     = '/www/wwwroot/blog2.1.4s5.cn/wp-content/uploads/titlepic';
$backup  = '/www/wwwroot/blog2.1.4s5.cn/wp-content/uploads/titlepic_bak';
$quality = 80;
$maxW    = 1000;

if (!function_exists('imagecreatefromwebp')) {
    die("❌ 当前 PHP 没有 WebP 支持\n");
}

if (!is_dir($dir)) die("❌ 目录不存在：$dir\n");

// ---- 备份 ----
if (!is_dir($backup)) {
    echo " 备份原图到 $backup ...\n";
    exec("cp -r " . escapeshellarg($dir) . " " . escapeshellarg($backup));
    echo "✅ 备份完成\n\n";
}

$files = glob($dir . '/*.webp');
$total = count($files);

echo " 开始压缩（质量 " . $quality . "，最大宽度 " . $maxW . "px），共 " . $total . " 张\n\n";

$ok = 0;
$skip = 0;
$before = 0;
$after = 0;

foreach ($files as $i => $file) {
    $size1 = filesize($file);
    $before += $size1;

    $img = @imagecreatefromwebp($file);
    if (!$img) {
        $skip++;
        $after += $size1;
        continue;
    }

    $w = imagesx($img);
    $h = imagesy($img);

    // 缩放
    if ($w > $maxW) {
        $newW = $maxW;
        $newH = (int)round($h * ($maxW / $w));
        $newImg = imagecreatetruecolor($newW, $newH);
        imagealphablending($newImg, false);
        imagesavealpha($newImg, true);
        imagecopyresampled($newImg, $img, 0, 0, 0, 0, $newW, $newH, $w, $h);
        imagedestroy($img);
        $img = $newImg;
    }

    // 保存
    $tmpFile = $file . '.tmp';
    $saved = imagewebp($img, $tmpFile, $quality);
    imagedestroy($img);

    if (!$saved || !file_exists($tmpFile)) {
        $skip++;
        $after += $size1;
        @unlink($tmpFile);
        continue;
    }

    $size2 = filesize($tmpFile);

    if ($size2 < $size1) {
        rename($tmpFile, $file);
        $ok++;
        $after += $size2;

        if ($ok % 20 === 0) {
            echo "  已压缩 " . $ok . " 张...\n";
        }
    } else {
        @unlink($tmpFile);
        $skip++;
        $after += $size1;
    }

    // 强制释放
    gc_collect_cycles();
}

echo "\n";
echo "============================================\n";
echo "✅ 处理完成\n";
echo "============================================\n";
echo "总计：    " . $total . " 张\n";
echo "已压缩：  " . $ok . " 张\n";
echo "跳过：    " . $skip . " 张\n";
echo "\n";
echo "压缩前：  " . round($before / 1024 / 1024, 1) . " MB\n";
echo "压缩后：  " . round($after / 1024 / 1024, 1) . " MB\n";

if ($before > $after) {
    $saved = $before - $after;
    $pct = round($saved * 100 / $before, 1);
    echo "节省：    " . round($saved / 1024 / 1024, 1) . " MB（约 " . $pct . "%）\n";
}

echo "\n 原图备份：" . $backup . "\n";
echo " 满意后可删：rm -rf " . $backup . "\n";
EOF

php /www/wwwroot/blog2.1.4s5.cn/compress.php

Expected Output

 开始压缩（质量 80，最大宽度 1000px），共 202 张

  已压缩 20 张...
  已压缩 40 张...
  ...

============================================
✅ 处理完成
============================================
总计：    202 张
已压缩：  202 张
跳过：    0 张

压缩前：  111 MB
压缩后：  12 MB
节省：    99 MB（约 89%）

Check individual effect

ls -lh /www/wwwroot/blog2.1.4s5.cn/wp-content/uploads/titlepic/166.webp