php 图片裁剪（保存图片和不保存图片）

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我是靠谱客的博主阔达画板，最近开发中收集的这篇文章主要介绍php 图片裁剪（保存图片和不保存图片），觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

案例一：

<?php
$src_path = 'https://guwanc.oss-cn-shanghai.aliyuncs.com/video/output/outimgs/2018/09/19/153734256819844_00001.jpg';
//创建源图的实例
$src = imagecreatefromstring(file_get_contents($src_path));

//list($src_w, $src_h) = getimagesize($src_img);  // 获取原图尺寸
$info = getimagesize($src_path);
//var_dump($info);exit;

//裁剪开区域左上角的点的坐标
$x = 1;
$y = 400;
//裁剪区域的宽和高
$width = 1100;
$height = 600;
//最终保存成图片的宽和高，和源要等比例，否则会变形
$final_width = 680;
$final_height = round($final_width * $height / $width);

//将裁剪区域复制到新图片上，并根据源和目标的宽高进行缩放或者拉升
$new_image = imagecreatetruecolor($final_width, $final_height);
imagecopyresampled($new_image, $src, 0, 0, $x, $y, $final_width, $final_height, $width, $height);

$ext = pathinfo($src_path, PATHINFO_EXTENSION);
$rand_name = md5(mt_rand() . time()) . "." . $ext;

//输出图片
/*header('Content-Type: image/jpeg');*/   //有头直接渲染图片;无头保存图片
imagejpeg($new_image,$rand_name);
imagedestroy($src);
imagedestroy($new_image);

案例二：

<?php
//剪裁图片
//1,打开图像
//2，创建一个空白的图像
$name="https://guwanc.oss-cn-shanghai.aliyuncs.com/video/output/outimgs/2018/09/19/153734256819844_00001.jpg";

cut($name,0,0,500,500);  //$x1,$x2 起点坐标；$y1,$y2 终点坐标；
function cut($name,$x1,$y1,$x2,$y2)
{
    function getinfo($name)
    {
        //getimagesize($dname)函数可以动态的获取图片类型，大小，宽度和高度等
        $info = getimagesize($name);
        $width = $info[0];
        $height = $info[1];
        $mime = $info['mime'];

        switch ($mime) {
            case 'image/jpeg':
                $res = imagecreatefromjpeg($name);
                break;
            case 'image/gif':
                $res = imagecreatefromgif($name);
                break;
            case 'image/png':
                $res = imagecreatefrompng($name);
                break;
            case 'image/wbmp':
                $res = imagecreatefromwbmp($name);
                break;
        }
        return array('width' => $width, 'height' => $height, 'res' => $res);
    }

    $info = getinfo($name);

    $img = imagecreatetruecolor(($x2 - $x1), ($y2 - $y1));
    imagecopymerge($img, $info['res'], 0, 0, $x1, $y1, ($x2 - $x1), ($y2 - $y1), 100);
    // header("content-type:image/png");    //有头直接渲染图片;无头保存图片
    // imagepng($img);
    $ext = pathinfo($name, PATHINFO_EXTENSION);
    $rand_name = md5(mt_rand() . time()) . "." . $ext;

    switch ($ext) {
        case 'jpg':
        case 'jpeg':
        case 'jpe':
            imagejpeg($img, $rand_name);
            break;
        case 'png':
            imagepng($img, $rand_name);
            break;
        case 'gif':
            imagegif($img, $rand_name);
            break;
        case 'bmp':
        case 'wbmp':
            imagewbmp($img, $rand_name);
            break;
    }
    //销毁资源
    imagedestroy($info['res']);
    imagedestroy($img);
}