在php中从中心自动裁剪图片

<?php
// 原始图片路径
$sourceImagePath = 'path/to/source/image.jpg';

// 目标尺寸
$targetWidth = 300;
$targetHeight = 200;

// 打开原始图片
$sourceImage = imagecreatefromjpeg($sourceImagePath);

// 获取原始图片的宽度和高度
$sourceWidth = imagesx($sourceImage);
$sourceHeight = imagesy($sourceImage);

// 计算裁剪后的宽度和高度
$scale = max($targetWidth / $sourceWidth, $targetHeight / $sourceHeight);
$cropWidth = $sourceWidth * $scale;
$cropHeight = $sourceHeight * $scale;

// 创建新的空白图片
$croppedImage = imagecreatetruecolor($targetWidth, $targetHeight);

// 缩放原始图片到新的空白图片
imagecopyresampled($croppedImage, $sourceImage, 0, 0, 0, 0, $cropWidth, $cropHeight, $sourceWidth, $sourceHeight);

// 计算裁剪的起始坐标
$cropX = ($cropWidth - $targetWidth) / 2;
$cropY = ($cropHeight - $targetHeight) / 2;

// 裁剪图片
$croppedImage = imagecrop($croppedImage, ['x' => $cropX, 'y' => $cropY, 'width' => $targetWidth, 'height' => $targetHeight]);

// 保存裁剪后的图片
imagejpeg($croppedImage, 'path/to/cropped/image.jpg');

// 释放内存
imagedestroy($sourceImage);
imagedestroy($croppedImage);
?>