php 按比例裁剪图片

<?php
function cropImage($imagePath, $width, $height, $outputPath) {
    $image = imagecreatefromjpeg($imagePath);
    $originalWidth = imagesx($image);
    $originalHeight = imagesy($image);

    // 计算裁剪区域
    if ($originalWidth / $originalHeight > $width / $height) {
        $newWidth = $originalHeight * $width / $height;
        $x = ($originalWidth - $newWidth) / 2;
        $y = 0;
    } else {
        $newHeight = $originalWidth * $height / $width;
        $x = 0;
        $y = ($originalHeight - $newHeight) / 2;
    }

    // 创建新的图像资源
    $croppedImage = imagecreatetruecolor($width, $height);
    imagecopyresampled($croppedImage, $image, 0, 0, $x, $y, $width, $height, $newWidth, $newHeight);

    // 保存裁剪后的图片
    imagejpeg($croppedImage, $outputPath);
    imagedestroy($image);
    imagedestroy($croppedImage);
}

// 使用示例
$imagePath = 'path/to/your/image.jpg';
$outputPath = 'path/to/output/cropped_image.jpg';
$width = 300;
$height = 200;

cropImage($imagePath, $width, $height, $outputPath);
?>