php创建sprite

$srcdir='./image/';
$prefix="pic11_";
$dst="image";
$imagedir=scandir($srcdir);
array_shift($imagedir);
array_shift($imagedir);
$width=0;
$height=0;
foreach ($imagedir as $key => $value) {
$picinfo=getimagesize($srcdir.$value);
$width=$picinfo[0]+$width;
if ($height<$picinfo[1]) {
$height=$picinfo[1];
}
}
$image=imagecreatetruecolor($width,$height);
imagesavealpha($image,true);
$color=imagecolorallocatealpha($image,127) ;
imagefill($image,$color);
$width=0;
$height=0;
$css="";
foreach ($imagedir as $key => $value) {
$picinfo=getimagesize($srcdir.$value);
$im=imagecreatefrompng($srcdir.$value); //创建image
imagecopymerge($image,$im,$width,$picinfo[0],$picinfo[1],100);
$picname=pathinfo($srcdir.$value);
$css=".".$prefix.$picname['filename']."{height:".$picinfo[0]."px;width:".$picinfo[1]."px;background-position: -".$width."px 0px;}".$css;
$width=$width+$picinfo[0];
imagedestroy($im); //销毁image
}
$css=$css."[class*=".$prefix."]{background-image:url('image.png');}}";
$css=$css.".".$prefix."{background-image:url('image.png');}";//兼容ie 系列
file_put_contents("./".$dst.'.css',$css);
imagepng($image,"./".$dst.'.png');
imagedestroy($image);
?>