用PHP写的一个压缩图片的函数,可批量压缩

将如下代码放到PHP文件里，定义好图片目录，运行PHP文件即可

$ddd='dirname';//定义要压缩的文件夹目录
echo edir($ddd);
function edir($ddir){
$dir=opendir($ddir);
if($dir){
while($file=readdir($dir)){
if($file!='.'&&$file!='..'&& !is_dir($dir.'/'.$file))$zarr[]=$file;}
}
foreach ($zarr as $v){
getThumb($ddir.'/'.$v,400,400);
}
}
function resizeImage($im, $dest, $maxwidth, $maxheight) {
$img = getimagesize($im);
switch ($img[2]) {
case 1:
$im = @imagecreatefromgif($im);
break;
case 2:
$im = @imagecreatefromjpeg($im);
break;
case 3:
$im = @imagecreatefrompng($im);
break;
}

$pic_width = imagesx($im);
$pic_height = imagesy($im);
$resizewidth_tag = false;
$resizeheight_tag = false;
if (($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, 0, 0, 0, 0, $newwidth, $newheight, $pic_width, $pic_height);
} else {
$newim = imagecreate($newwidth, $newheight);
imagecopyresized($newim, $im, 0, 0, 0, 0, $newwidth, $newheight, $pic_width, $pic_height);
}

imagejpeg($newim, $dest);
imagedestroy($newim);
} else {
imagejpeg($im, $dest);
}
}
/**
* 图片压缩处理
* @param string $sFile 源图片路径
* @param int $iWidth 自定义图片宽度
* @param int $iHeight 自定义图片高度
* @return string 压缩后的图片路径
*/

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