PHP压缩裁剪图片实例

/**
* @param $srcImage 原图片路径
* @param $toFile   裁剪后图片路径
* @param int $maxWidth   裁剪最大的宽度
* @param int $maxHeight  裁剪后最大的高度
* @param int $imgQuality 图片的质量
* @return bool|string|void
*/
function resize($srcImage,$toFile,$maxWidth = 640,$maxHeight = 480,$imgQuality=100)
{
list($width, $height, $type, $attr) = getimagesize($srcImage);
if($width < $maxWidth  || $height < $maxHeight) return ;
switch ($type) {//判断图片类别
case 1: $img = imagecreatefromgif($srcImage); break;
case 2: $img = imagecreatefromjpeg($srcImage); break;
case 3: $img = imagecreatefrompng($srcImage); break;
}
$scale = min($maxWidth/$width, $maxHeight/$height);
if($scale < 1) {
$newWidth = floor($scale*$width);
$newHeight = floor($scale*$height);
$newImg = imagecreatetruecolor($newWidth, $newHeight);
imagecopyresampled($newImg, $img, 0, 0, 0, 0, $newWidth, $newHeight, $width, $height);
$newName = "";
$toFile = preg_replace("/(.gif|.jpg|.jpeg|.png)/i","",$toFile);
switch($type) {
case 1: if(imagegif($newImg, "$toFile$newName.gif", $imgQuality))
return "$newName.gif"; break;
case 2: if(imagejpeg($newImg, "$toFile$newName.jpg", $imgQuality))
return "$newName.jpg"; break;
case 3: if(imagepng($newImg, "$toFile$newName.png", $imgQuality))
return "$newName.png"; break;
default: if(imagejpeg($newImg, "$toFile$newName.jpg", $imgQuality))
return "$newName.jpg"; break;
}
imagedestroy($newImg);
}
imagedestroy($img);
return false;
}