php打造缩略图图片

php制作缩略图图片

<?phpif (! isset ( $_POST ["submit"] )) {	echo "<?xml version=\"1.0\" encoding=\"UTF-8\"";} else {	if (isset ( $_FILES ["file"] ) || $_POST ["file"] != "") {		function resizeimage($file, $rate = .5) {			$size = getimagesize ( $file );			switch ($size [2]) {				case 1 :					$img = imagecreatefromgif ( $file );					break;				case 2 :					$img = imagecreatefromjpeg ( $file );					break;				case 3 :					$img = imagecreatefrompng ( $file );					break;			}			$srcw = imagesx ( $img );			$srch = imagesy ( $img );			$detw = floor ( $srcw * $rate );			$deth = floor ( $srch * $rate );			$im = imagecreatetruecolor ( $detw, $deth );			$black = imagecolorallocate ( $im, 255, 255, 255 );			imagefilledrectangle ( $im, 0, 0, $detw, $deth, $black );			imagecopyresized ( $im, $img, 0, 0, 0, 0, $detw, $deth, $srcw, $srch );			header ( 'Content-type:image/png' );			imagepng ( $im );			imagedestroy ( $im );			imagedestroy ( $img );		}		resizeimage ( $_FILES ["file"] ["tmp_name"] );	}}?><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Insert title here</title><style type="text/css">td {	margin: 0;}</style><script type="text/javascript">function submit(){	obj=document.form1.submit();	return obj;}</script>

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