php-bulk-resize-image.php

<?php
/**
 * Bulk Image Resizer for PHP & MySQL Applications
 * Automatically detects Imagick or GD.
 *
 * @package codetot-optimization
 * @author codetot, khoipro, gemini
 * @since 0.0.1
 *
 * Usage: copy to your project, and run 'php php-bulk-resize-image.php'
 * 
 */

// --- CONFIGURATION ---
$config = [
    'source_dir'   => __DIR__ . '/uploads/gallery', // Change to your image folder
    'target_width' => 600,                         // Mobile width
    'suffix'       => '-mobile',                   // Suffix for new files
    'quality'      => 75,                          // 0-100 (75 is best for web)
    'batch_limit'  => 500,                         // Set limit if running via browser
];

// --- SERVER TWEAKS ---
ini_set('memory_limit', '512M');
set_time_limit(0); // Unlimited execution time for CLI

// --- INITIALIZATION ---
$is_cli = (php_sapi_name() === 'cli');
$has_imagick = extension_loaded('imagick');
$has_gd = extension_loaded('gd');

echo $is_cli ? "Starting Bulk Resize...\n" : "<h3>Starting Bulk Resize</h3>";

if (!$has_imagick && !$has_gd) {
    die("Error: Neither Imagick nor GD library is installed.");
}

echo "Using Library: " . ($has_imagick ? "Imagick (High Speed)" : "GD (Standard)") . ($is_cli ? "\n" : "<br>");

// --- THE PROCESSING LOOP ---
try {
    $directory = new RecursiveDirectoryIterator($config['source_dir']);
    $iterator = new RecursiveIteratorIterator($directory);
    $processed_count = 0;
    $skipped_count = 0;

    foreach ($iterator as $file) {
        if ($file->isDir()) continue;

        $path = $file->getPathname();
        $ext = strtolower($file->getExtension());

        // 1. Filter: Only process JPG/PNG
        if (!in_array($ext, ['jpg', 'jpeg', 'png'])) continue;

        // 2. Filter: Skip if file is already a mobile version
        if (strpos($path, $config['suffix']) !== false) continue;

        $outputPath = $file->getPath() . '/' . $file->getBasename('.' . $ext) . $config['suffix'] . '.' . $ext;

        // 3. Filter: Skip if mobile version already exists (Resume capability)
        if (file_exists($outputPath)) {
            $skipped_count++;
            continue;
        }

        // --- RESIZE EXECUTION ---
        if ($has_imagick) {
            processWithImagick($path, $outputPath, $config);
        } else {
            processWithGD($path, $outputPath, $config, $ext);
        }

        $processed_count++;
        
        // Progress Feedback
        if ($processed_count % 50 === 0) {
            echo "Processed: $processed_count files..." . ($is_cli ? "\n" : "<br>");
            // Flush buffer for web view
            if (!$is_cli) { @ob_flush(); flush(); }
        }
    }

    echo ($is_cli ? "\nCOMPLETED!" : "<h3>COMPLETED!</h3>");
    echo "New Images Created: $processed_count" . ($is_cli ? "\n" : "<br>");
    echo "Already Existed (Skipped): $skipped_count" . ($is_cli ? "\n" : "<br>");

} catch (Exception $e) {
    die("Fatal Error: " . $e->getMessage());
}

// --- HELPER FUNCTIONS ---

function processWithImagick($input, $output, $config) {
    $img = new Imagick($input);
    // Lanczos is a high-quality filter for downscaling
    $img->resizeImage($config['target_width'], 0, Imagick::FILTER_LANCZOS, 1);
    $img->stripImage(); // Removes EXIF data for smaller file size
    $img->setImageCompressionQuality($config['quality']);
    $img->writeImage($output);
    $img->clear();
    $img->destroy();
}

function processWithGD($input, $output, $config, $ext) {
    if ($ext === 'png') {
        $src = @imagecreatefrompng($input);
    } else {
        $src = @imagecreatefromjpeg($input);
    }

    if (!$src) return;

    $oldW = imagesx($src);
    $oldH = imagesy($src);
    
    if ($oldW <= $config['target_width']) {
        imagedestroy($src);
        return;
    }

    $newH = floor($oldH * ($config['target_width'] / $oldW));
    $tmp = imagecreatetruecolor($config['target_width'], $newH);

    // Transparency for PNG
    if ($ext === 'png') {
        imagealphablending($tmp, false);
        imagesavealpha($tmp, true);
    }

    imagecopyresampled($tmp, $src, 0, 0, 0, 0, $config['target_width'], $newH, $oldW, $oldH);

    if ($ext === 'png') {
        imagepng($tmp, $output, 7); // 0-9 scale
    } else {
        imagejpeg($tmp, $output, $config['quality']);
    }

    imagedestroy($src);
    imagedestroy($tmp);
}