php 图片剪切

 1 <?php
 2 
 3 /**
 4  * 图像裁剪
 5  * @param $source_path 原图路径
 6  * @param $target_width 需要裁剪的宽
 7  * @param $target_height 需要裁剪的高
 8  * @return bool
 9  */
10 function imagecropper($source_path, $target_width, $target_height)
11 {
12     $source_info   = getimagesize($source_path);
13     $source_width  = $source_info[0];
14     $source_height = $source_info[1];
15     $source_mime   = $source_info['mime'];
16     $source_ratio  = $source_height / $source_width;
17     $target_ratio  = $target_height / $target_width;
18 
19     // 源图过高
20     if ($source_ratio > $target_ratio) {
21         $cropped_width  = $source_width;
22         $cropped_height = $source_width * $target_ratio;
23         $source_x       = 0;
24         $source_y       = ($source_height - $cropped_height) / 2;
25     } // 源图过宽
26     elseif ($source_ratio < $target_ratio) {
27         $cropped_width  = $source_height / $target_ratio;
28         $cropped_height = $source_height;
29         $source_x       = ($source_width - $cropped_width) / 2;
30         $source_y       = 0;
31     } // 源图适中
32     else {
33         $cropped_width  = $source_width;
34         $cropped_height = $source_height;
35         $source_x       = 0;
36         $source_y       = 0;
37     }
38     $funcList = array(
39         'image/gif'  => array(
40             'create' => 'imagecreatefromgif',
41             'make'   => 'imagegif',
42             'mime'   => '.gif',
43         ),
44         'image/jpeg' => array(
45             'create' => 'imagecreatefromjpeg',
46             'make'   => 'imagejpeg',
47             'mime'   => '.jpg',
48         ),
49         'image/png'  => array(
50             'create' => 'imagecreatefrompng',
51             'make'   => 'imagepng',
52             'mime'   => '.png',
53         ),
54     );
55     if (isset($funcList[$source_mime])) {
56         $curFunc = $funcList[$source_mime];
57     } else {
58         return FALSE;
59     }
60     $source_image = $curFunc['create']($source_path);
61 
62     $target_image  = imagecreatetruecolor($target_width, $target_height);
63     $cropped_image = imagecreatetruecolor($cropped_width, $cropped_height);
64 
65     // 裁剪
66     imagecopy($cropped_image, $source_image, 0, 0, $source_x, $source_y, $cropped_width, $cropped_height);
67     // 缩放
68     imagecopyresampled($target_image, $cropped_image, 0, 0, 0, 0, $target_width, $target_height, $cropped_width, $cropped_height);
69 
70     //保存图片到本地(两者选一)
71     $randNumber = mt_rand(00000, 99999) . mt_rand(000, 999);
72     //$fileName   = substr(md5($randNumber), 8, 16) . ".png";
73     $fileName = time() . '_' . substr(md5($randNumber), 8, 16) . $curFunc['mime'];
74     //imagepng($target_image, './' . $fileName);
75     //imagepng($target_image, './' . $fileName);
76     //$imgFunc2($target_image, './' . $fileName);
77     $curFunc['make']($target_image, './' . $fileName);
78     imagedestroy($target_image);
79 
80     //直接在浏览器输出图片(两者选一)
81     /*header('Content-Type: image/jpeg');
82     imagepng($target_image);
83     imagedestroy($target_image);
84     imagejpeg($target_image);
85     imagedestroy($source_image);
86     imagedestroy($target_image);
87     imagedestroy($cropped_image);*/
88 }
89 
90 //调用
91 //imagecropper('./img033.jpg',300,300);
92 imagecropper('./4.jpg', 140, 140);
93 //imagecropper('./img033.jpg',55,55);
94 ?>

<?php

/**
* 图像裁剪
* @param $source_path 原图路径
* @param $target_width 需要裁剪的宽
* @param $target_height 需要裁剪的高
* @return bool
*/
function imagecropper($source_path, $target_width, $target_height)
{
$source_info = getimagesize($source_path);
$source_width = $source_info[0];
$source_height = $source_info[1];
$source_mime = $source_info['mime'];
$source_ratio = $source_height / $source_width;
$target_ratio = $target_height / $target_width;

// 源图过高
if ($source_ratio > $target_ratio) {
$cropped_width = $source_width;
$cropped_height = $source_width * $target_ratio;
$source_x = 0;
$source_y = ($source_height - $cropped_height) / 2;
} // 源图过宽
elseif ($source_ratio < $target_ratio) {
$cropped_width = $source_height / $target_ratio;
$cropped_height = $source_height;
$source_x = ($source_width - $cropped_width) / 2;
$source_y = 0;
} // 源图适中
else {
$cropped_width = $source_width;
$cropped_height = $source_height;
$source_x = 0;
$source_y = 0;
}
$funcList = array(
'image/gif' => array(
'create' => 'imagecreatefromgif',
'make' => 'imagegif',
'mime' => '.gif',
),
'image/jpeg' => array(
'create' => 'imagecreatefromjpeg',
'make' => 'imagejpeg',
'mime' => '.jpg',
),
'image/png' => array(
'create' => 'imagecreatefrompng',
'make' => 'imagepng',
'mime' => '.png',
),
);
if (isset($funcList[$source_mime])) {
$curFunc = $funcList[$source_mime];
} else {
return FALSE;
}
$source_image = $curFunc['create']($source_path);

$target_image = imagecreatetruecolor($target_width, $target_height);
$cropped_image = imagecreatetruecolor($cropped_width, $cropped_height);

// 裁剪
imagecopy($cropped_image, $source_image, 0, 0, $source_x, $source_y, $cropped_width, $cropped_height);
// 缩放
imagecopyresampled($target_image, $cropped_image, 0, 0, 0, 0, $target_width, $target_height, $cropped_width, $cropped_height);

//保存图片到本地(两者选一)
$randNumber = mt_rand(00000, 99999) . mt_rand(000, 999);
//$fileName = substr(md5($randNumber), 8, 16) . ".png";
$fileName = time() . '_' . substr(md5($randNumber), 8, 16) . $curFunc['mime'];
//imagepng($target_image, './' . $fileName);
//imagepng($target_image, './' . $fileName);
//$imgFunc2($target_image, './' . $fileName);
$curFunc['make']($target_image, './' . $fileName);
imagedestroy($target_image);

//直接在浏览器输出图片(两者选一)
/*header('Content-Type: image/jpeg');
imagepng($target_image);
imagedestroy($target_image);
imagejpeg($target_image);
imagedestroy($source_image);
imagedestroy($target_image);
imagedestroy($cropped_image);*/
}

//调用
//imagecropper('./img033.jpg',300,300);
imagecropper('./4.jpg', 140, 140);
//imagecropper('./img033.jpg',55,55);
?>