/**
* *
*等比縮放
* @param unknown_type srcImage源圖片路徑∗@paramunknowntypetoFile 目標圖片路徑
* @param unknown_type maxWidth最大寬∗@paramunknowntypemaxHeight 最大高
* @param unknown_type imgQuality圖片質量∗@returnunknown∗/functionresize(srcImage,toFile,maxWidth = 100,maxHeight=100,imgQuality=100)
{

list($width, $height, $type, $attr) = getimagesize($srcImage); 
if($width < $maxWidth  || $height < $maxHeight) return ; 
switch ($type) { 
case 1: $img = imagecreatefromgif($srcImage); break; 
case 2: $img = imagecreatefromjpeg($srcImage); break; 
case 3: $img = imagecreatefrompng($srcImage); break; 
} 
$scale = min($maxWidth/$width, $maxHeight/$height); //求出綻放比例 

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; 
 

}