利用PHP实现图片等比例放大和缩小的方法详解

PHP 2018-12-30

<div class="codetitle"><a style="CURSOR: pointer" data="97800" class="copybut" id="copybut97800" onclick="doCopy('code97800')"> 代码如下:

<div class="codebody" id="code97800">
function resizeimage($srcfile,$mySize){
$size=getimagesize($srcfile);
switch($size[2]){
case 1:
$img=imagecreatefromgif($srcfile);
break;
case 2:
$img=imagecreatefromjpeg($srcfile);
break;
case 3:
$img=imagecreatefrompng($srcfile);
break;
}

//源图片的宽度和高度

$oldImg['w']=imagesx($img);
$oldImg['h']=imagesy($img);
if ($oldImg['w']<=$mySize['w'] && $oldImg['h']<156){
$rate=1;
}elseif ($oldImg['w']>$mySize['w'] && $oldImg['h']<$mySize['h']){
$rate=$mySize['w']/$oldImg['w'];
}elseif ($oldImg['w']<$mySize['w'] && $oldImg['h']>$mySize['h']){
$rate=$mySize['h']/$oldImg['h'];
}elseif ($oldImg['w']>$mySize['w'] && $oldImg['h']>$mySize['h']){
$rate1=$mySize['w']/$oldImg['w'];
$rate2=$mySize['h']/$oldImg['h'];
if ($rate1>$rate2){$rate=$rate2;}else{$rate=$rate1;}
}
$newImg['w']=$oldImg['w']$rate;
$newImg['h']=$oldImg['h']$rate;
return "width=".$newImg['w']." height=".$newImg['h'];
}

应用实例

<div class="codetitle"><a style="CURSOR: pointer" data="89514" class="copybut" id="copybut89514" onclick="doCopy('code89514')"> 代码如下:

<div class="codebody" id="code89514">
$mySize=array('w'=>143,'h'=>156);
$imgSize=resizeimage("22.jpg",$mySize);
echo "<img src=\"22.jpg\"".resizeimage("22.jpg",$mySize)."/>";

图片图片图片等比例放大缩小缩小缩小

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