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php制作缩略图图片

 2011/12/21 9:08:41  ErnestChen  http://ernestchen.iteye.com  我要评论(0)
  • 摘要:<?phpif(!isset($_POST["submit"])){echo"<?xmlversion=\"1.0\"encoding=\"UTF-8\"";}else{if(isset($_FILES["file"])||$_POST["file"]!=""){functionresizeimage($file,$rate=.5){$size=getimagesize($file);switch($size[2]){case1:$img=imagecreatefromgif
  • 标签:PHP 图片
<?php
if (! 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"] );
	}
}
?>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<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>
</head>
<body>
<form name="form1" method="post" enctype="multipart/form-data"
	action="<?php
	echo $_SERVER ["PHP_SELF"]?>">
<table cellpadding="0" cellspacing="0" border="0"
	bordercolordark="#ffffff" bordercolorlight="#0000ff">
	<tr>
		<td><label>FileUpload : </label></td>
		<td><input type="file" name="file"></input></td>
		<td><input type="submit" name="submit" value="Submit"></input></td>
	</tr>
</table>
</form>
</body>
</html>
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