<?php
/**
* 图片缩放函数（可设置高度固定，宽度固定或者最大宽高，支持gif/jpg/png三种类型）
* @param string $source_path 源图片
* @param int $target_width 目标宽度
* @param int $target_height 目标高度
* @param string $fixed_orig 锁定宽高（可选参数 width、height或者空值）
* @return string
*/
function myImageResize($source_path, $target_width = 200, $target_height = 200, $fixed_orig = ''){
$source_info = getimagesize($source_path);
$source_width = $source_info[0];
$source_height = $source_info[1];
$source_mime = $source_info['mime'];
$ratio_orig = $source_width / $source_height;
//$fixed_orig随便填写,将强制按照填写的大小存储
if ($fixed_orig == 'width'){
//宽度固定
$target_height = $target_width / $ratio_orig;
} elseif ($fixed_orig == 'height'){
//高度固定
$target_width = $target_height * $ratio_orig;
} elseif ($fixed_orig === '') {
//最大宽或最大高
if ($target_width / $target_height > $ratio_orig){
$target_width = $target_height * $ratio_orig;
}else{
$target_height = $target_width / $ratio_orig;
}
}
switch ($source_mime){
case 'image/gif':
$source_image = imagecreatefromgif($source_path);
break;
case 'image/jpeg':
$source_image = imagecreatefromjpeg($source_path);
break;
case 'image/png':
$source_image = imagecreatefrompng($source_path);
break;
default:
return false;
break;
}
$target_image = imagecreatetruecolor($target_width, $target_height);
imagecopyresampled($target_image, $source_image, 0, 0, 0, 0, $target_width, $target_height, $source_width, $source_height);
$imgArr = explode('.', $source_path);
$target_path = $imgArr[0] . '_new.' . $imgArr[1];
imagejpeg($target_image, $target_path, 100);
imagedestroy($target_image);
imagedestroy($source_image);
}
$filename= '1.jpg';
myImageResize($filename, 200, 200, 'free'); //宽高200
?>
