简明现代魔法 -> PHP服务器脚本 -> PHP支持多种格式图片上传

PHP支持多种格式图片上传

2010-12-20

简单地写了一个PHP的图片上传,可以支持jpg、png、gif等格式的图片,如果你想支持更多的格式,比如bmp,可以自己扩充。不是面向对象的,在这里简单记录下,以便以后取用。

此处一次支持上传2个图片,上传后生成原图和质量较差的图,原图用于保存质量高的图片,质量差的图用于网页显示。

PHP Code

<?php
include_once("db.php");
include_once("dbinfo.php");

$connector = new nmdb($host, $username, $password);
$connector -> select_db($database);

$work_group = check_input($_POST['work_group']);
$name = check_input($_POST['name']);
$tel = check_input($_POST['tel']);
$id_card = check_input($_POST['id_card']);
$work_name = check_input($_POST['work_name']);
$place = check_input($_POST['place']);
$work1 = check_input($_POST['work1']);

date_default_timezone_set('PRC');
$date = date("Y-m-d H:i:s");

$quality = 100;
$quality2 = 70;

$quality_png = 9;
$quality2_png = 7;

if(isset($_FILES['work1']) && $_FILES['work1']['error']==0)
{
	$size = getimagesize($_FILES['work1']['tmp_name']);
	$original = $_FILES['work1']['tmp_name'];
	$type = $_FILES['work1']['type'];
	//echo $type;
	$target_name = date('YmdHis').'_'.preg_replace('`[^a-z0-9-_.]`i','',$_FILES['work1']['name']);
	$work1 = $target_name;
	$target = dirname(__FILE__).'/uploads/'.$target_name;
	
	switch($type)
	{
		case "image/jpeg":
		$resultImage = imagecreatefromjpeg($original);
		imagejpeg($resultImage, $target, $quality); 
		break;
		
		case "image/png":
		$resultImage = imagecreatefrompng($original);
		imagepng($resultImage, $target, $quality_png);
		break;
		
		case "image/gif":
		$resultImage = imagecreatefromgif($original);
		imagegif($resultImage, $target, $quality);
		break;
		
		default :
		die("不支持此文件类型");
        exit;
	}
	
	$work1_small = $target_name;
	$target = dirname(__FILE__).'/uploads/small/'.$target_name;
	
	switch($type)
	{
		case "image/jpeg":
		$resultImage = imagecreatefromjpeg($original);
		imagejpeg($resultImage, $target, $quality2); 
		break;
		
		case "image/png":
		$resultImage = imagecreatefrompng($original);
		imagepng($resultImage, $target, $quality2_png);
		break;
		
		case "image/gif":
		$resultImage = imagecreatefromgif($original);
		imagegif($resultImage, $target, $quality2);
		break;
		
		default :
		die("不支持此文件类型");
        exit;
	}
}

if(isset($_FILES['work2']) && $_FILES['work2']['error']==0)
{
	$size = getimagesize($_FILES['work2']['tmp_name']);
	$original = $_FILES['work2']['tmp_name'];
	$type = $_FILES['work2']['type'];
	$target_name = date('YmdHis').'_'.preg_replace('`[^a-z0-9-_.]`i','',$_FILES['work2']['name']);
	$work2 = $target_name;
	$target = dirname(__FILE__).'/uploads/'.$target_name;
	
	switch($type)
	{
		case "image/jpeg":
		$resultImage = imagecreatefromjpeg($original);
		imagejpeg($resultImage, $target, $quality); 
		break;
		
		case "image/png":
		$resultImage = imagecreatefrompng($original);
		imagepng($resultImage, $target, $quality_png);
		break;
		
		case "image/gif":
		$resultImage = imagecreatefromgif($original);
		imagegif($resultImage, $target, $quality);
		break;
		
		default :
		die("不支持此文件类型");
        exit;
	}
	
	$work2_small = $target_name;
	$target = dirname(__FILE__).'/uploads/small/'.$target_name;
	
	switch($type)
	{
		case "image/jpeg":
		$resultImage = imagecreatefromjpeg($original);
		imagejpeg($resultImage, $target, $quality2); 
		break;
		
		case "image/png":
		$resultImage = imagecreatefrompng($original);
		imagepng($resultImage, $target, $quality2_png);
		break;
		
		case "image/gif":
		$resultImage = imagecreatefromgif($original);
		imagegif($resultImage, $target, $quality2);
		break;
		
		default :
		die("不支持此文件类型");
        exit;
	}
}

$sql="insert into photo(work_group,name,tel,id_card,work_name,place,work,work_small,date)   values('$work_group','$name','$tel','$id_card','$work_name','$place','$work1','$work1_small','$date')";
//echo $sql;
$result = $connector -> query($sql) or die(mysql_error());

if($work2 != "" && $work2_small != null)
{
	$sql2="insert into photo(work_group,name,tel,id_card,work_name,place,work,work_small,date)   			values('$work_group','$name','$tel','$id_card','$work_name','$place','$work2','$work2_small','$date')";
	
	$result2 = $connector -> query($sql2) or die(mysql_error());
}

$connector -> close($connector);

$page="../upload.php";
echo "<script>alert('上传成功!'); window.location = \"".$page."\";</script>";
?>

有些问题需要说明下:

JPEG图像生成的图像的质量的是一个范围从0(最低质量,最小的文件大小)到100(最高质量,最大文件大小)。而ImagePNG生成图像的质量范围从0到9的,传入的这个范围以外的参数则该函数不会工作。

判断上传文件的类型,$type = $_FILES['work1']['type'];。

创建各种格式的图片可以使用这些函数:imagecreatefromjpeg()、imagecreatefrompng()、imagecreatefromgif()。

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