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Upload File : current_dir [ Writeable ] document_root [ Writeable ]

<?php
/**
 * Dynamic Favicon Generator
 * Serves a favicon from assets/images/og-image.png
 * This prevents 404 errors and redirects
 */

// Check if GD library is available
if (!extension_loaded('gd')) {
    // Fallback: serve a simple 1x1 transparent PNG
    header('Content-Type: image/png');
    header('Cache-Control: public, max-age=31536000, immutable');
    echo base64_decode('iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+M9QDwADhgGAWjR9awAAAABJRU5ErkJggg==');
    exit;
}

// Source image path
$source_image = __DIR__ . '/assets/images/og-image.png';

// Check if source exists
if (!file_exists($source_image)) {
    // Fallback: serve a simple 1x1 transparent PNG
    header('Content-Type: image/png');
    header('Cache-Control: public, max-age=31536000, immutable');
    echo base64_decode('iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+M9QDwADhgGAWjR9awAAAABJRU5ErkJggg==');
    exit;
}

// Load source image
$source = @imagecreatefrompng($source_image);
if (!$source) {
    header('Content-Type: image/png');
    header('Cache-Control: public, max-age=31536000, immutable');
    echo base64_decode('iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+M9QDwADhgGAWjR9awAAAABJRU5ErkJggg==');
    exit;
}

// Create 32x32 favicon
$size = 32;
$favicon = imagecreatetruecolor($size, $size);

// Enable alpha blending
imagealphablending($favicon, false);
imagesavealpha($favicon, true);

// Fill with transparent background
$transparent = imagecolorallocatealpha($favicon, 0, 0, 0, 127);
imagefill($favicon, 0, 0, $transparent);

// Resize source image to favicon size
imagealphablending($favicon, true);
imagecopyresampled($favicon, $source, 0, 0, 0, 0, $size, $size, imagesx($source), imagesy($source));

// Set headers for caching
header('Content-Type: image/png');
header('Cache-Control: public, max-age=31536000, immutable');
header('Last-Modified: ' . gmdate('D, d M Y H:i:s', filemtime($source_image)) . ' GMT');
header('ETag: "' . md5_file($source_image) . '"');

// Output the favicon
imagepng($favicon);

// Clean up
imagedestroy($source);
imagedestroy($favicon);