基于PHP实现等比压缩图片大小


            废话不多说了，直接给大家贴php等比压缩图片大小的相关代码了，具体代码如下所示：





<?php

$im = imagecreatefromjpeg('D:\phpplace\.jpeg');

resizeImage($im,,,'xinde','.jpg');

function resizeImage($im,$maxwidth,$maxheight,$name,$filetype)

{

$pic_width = imagesx($im);

$pic_height = imagesy($im);

echo "start-----------------" ;

if(($maxwidth && $pic_width > $maxwidth) && ($maxheight && $pic_height > $maxheight))

{

if($maxwidth && $pic_width>$maxwidth)

{

$widthratio = $maxwidth/$pic_width;

$resizewidth_tag = true;

}

if($maxheight && $pic_height>$maxheight)

{

$heightratio = $maxheight/$pic_height;

$resizeheight_tag = true;

}

if($resizewidth_tag && $resizeheight_tag)

{

if($widthratio<$heightratio)

$ratio = $widthratio;

else

$ratio = $heightratio;

}

if($resizewidth_tag && !$resizeheight_tag)

$ratio = $widthratio;

if($resizeheight_tag && !$resizewidth_tag)

$ratio = $heightratio;

$newwidth = $pic_width * $ratio;

$newheight = $pic_height * $ratio;

if(function_exists("imagecopyresampled"))

{

$newim = imagecreatetruecolor($newwidth,$newheight);

imagecopyresampled($newim,$im,,,,,$newwidth,$newheight,$pic_width,$pic_height);

}

else

{

$newim = imagecreate($newwidth,$newheight);

imagecopyresized($newim,$im,,,,,$newwidth,$newheight,$pic_width,$pic_height);

}

$name = $name.$filetype;

imagejpeg($newim,$name);

imagedestroy($newim);

}

else

{

$name = $name.$filetype;

imagejpeg($im,$name);

} 

} 



以上代码内容是小编给大家介绍的基于PHP实现等比压缩图片大小的相关内容，代码简单易懂，哪里写的不好，欢迎各位大侠多多提出宝贵意见，小编非常乐意。