利用PHP实现图片等比例放大和缩小
时间：2021-07-01 10:21:17
帮助过：17人阅读
- function resizeimage($srcfile,$mySize){
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- $size=getimagesize($srcfile);
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- switch($size[2]){
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- case 1:
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- $img=imagecreatefromgif($srcfile);
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- break;
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- case 2:
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- $img=imagecreatefromjpeg($srcfile);
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- break;
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- case 3:
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- $img=imagecreatefrompng($srcfile);
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- break;
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- }
- //源图片的宽度和高度
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- $oldImg['w']=imagesx($img);
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- $oldImg['h']=imagesy($img);
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- if ($oldImg['w']<=$mySize['w'] && $oldImg['h']<156){
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- $rate=1;
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- }elseif ($oldImg['w']>$mySize['w'] && $oldImg['h']<$mySize['h']){
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- $rate=$mySize['w']/$oldImg['w'];
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- }elseif ($oldImg['w']<$mySize['w'] && $oldImg['h']>$mySize['h']){
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- $rate=$mySize['h']/$oldImg['h'];
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- }elseif ($oldImg['w']>$mySize['w'] && $oldImg['h']>$mySize['h']){
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- $rate1=$mySize['w']/$oldImg['w'];
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- $rate2=$mySize['h']/$oldImg['h'];
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- if ($rate1>$rate2){$rate=$rate2;}else{$rate=$rate1;}
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- }
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- $newImg['w']=$oldImg['w']*$rate;
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- $newImg['h']=$oldImg['h']*$rate;
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- return "width=".$newImg['w']." height=".$newImg['h'];
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- }
应用实例 - $mySize=array('w'=>143,'h'=>156);
- $imgSize=resizeimage("22.jpg",$mySize);
- echo "
![](\"22.jpg\"".resizeimage("22.jpg",$mySize)."/) ";
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大和, 等比例, PHP
