php gif裁剪

<?php
function cropGif($inputFile, $outputFile, $x, $y, $width, $height) {
    $gif = imagecreatefromgif($inputFile);
    if ($gif === false) {
        die('无法读取GIF文件');
    }

    $croppedGif = imagecreatetruecolor($width, $height);
    imagecopyresampled($croppedGif, $gif, 0, 0, $x, $y, $width, $height, $width, $height);

    // 保存调色板和透明度信息
    $palette = imagecolortransparent($gif);
    if ($palette !== -1) {
        imagecolortransparent($croppedGif, $palette);
    }

    imagegif($croppedGif, $outputFile);
    imagedestroy($gif);
    imagedestroy($croppedGif);
}

// 示例调用
cropGif('input.gif', 'output.gif', 10, 10, 100, 100);
?>