PHP多種圖片格式的簡單上傳

簡單地寫了一個PHP的圖片上傳，可以支持jpg、png、gif等格式的圖片，如果你想支持更多的格式，比如bmp，可以自己擴充。不是面向對象的，在這裡簡單記錄下，以便以後取用。

此處一次支持上傳2個圖片，上傳後生成原圖和質量較差的圖，原圖用於保存質量高的圖片，質量差的圖用於網頁顯示。

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("不支持此文件類型");
        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("不支持此文件類型");
        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("不支持此文件類型");
        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("不支持此文件類型");
        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);
$page="../upload.php";
echo "<script>alert('上傳成功！'); window.location = "".$page."";</script>";
?>

有些問題需要說明下：

JPEG圖像生成的圖像的質量的是一個范圍從0（最低質量，最小的文件大小）到100（最高質量，最大文件大小）。而ImagePNG生成圖像的質量范圍從0到9的，傳入的這個范圍以外的參數則該函數不會工作。

判斷上傳文件的類型，$type = $_FILES['work1']['type'];。

創建各種格式的圖片可以使用這些函數：imagecreatefromjpeg()、imagecreatefrompng()、imagecreatefromgif()。