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PHP支持多種格式圖片上傳(支持jpg、png、gif)

更新時(shí)間：2011年11月03日 19:10:43 作者：

簡(jiǎn)單地寫了一個(gè)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(kuò)充。不是面向?qū)ο蟮模谶@里簡(jiǎn)單記錄下，以便以后取用

此處一次支持上傳2個(gè)圖片，上傳后生成原圖和質(zhì)量較差的圖，原圖用于保存質(zhì)量高的圖片，質(zhì)量差的圖用于網(wǎng)頁(yè)顯示。
PHP Code

 
<?php 
include_once(&quot;db.php&quot;); 
include_once(&quot;dbinfo.php&quot;); 
$connector = new nmdb($host, $username, $password); 
$connector -> select_db($database); 
$work_group = check_input($_POST&#91;&#039;work_group&#039;&#93;); 
$name = check_input($_POST&#91;&#039;name&#039;&#93;); 
$tel = check_input($_POST&#91;&#039;tel&#039;&#93;); 
$id_card = check_input($_POST&#91;&#039;id_card&#039;&#93;); 
$work_name = check_input($_POST&#91;&#039;work_name&#039;&#93;); 
$place = check_input($_POST&#91;&#039;place&#039;&#93;); 
$work1 = check_input($_POST&#91;&#039;work1&#039;&#93;); 
date_default_timezone_set(&#039;PRC&#039;); 
$date = date(&quot;Y-m-d H:i:s&quot;); 
$quality = 100; 
$quality2 = 70; 
$quality_png = 9; 
$quality2_png = 7; 
if(isset($_FILES&#91;&#039;work1&#039;&#93;) &amp;&amp; $_FILES&#91;&#039;work1&#039;&#93;&#91;&#039;error&#039;&#93;==0) 
{ 
$size = getimagesize($_FILES&#91;&#039;work1&#039;&#93;&#91;&#039;tmp_name&#039;&#93;); 
$original = $_FILES&#91;&#039;work1&#039;&#93;&#91;&#039;tmp_name&#039;&#93;; 
$type = $_FILES&#91;&#039;work1&#039;&#93;&#91;&#039;type&#039;&#93;; 
//echo $type; 
$target_name = date(&#039;YmdHis&#039;).&#039;_&#039;.preg_replace(&#039;`&#91;^a-z0-9-_.&#93;`i&#039;,&#039;&#039;,$_FILES&#91;&#039;work1&#039;&#93;&#91;&#039;name&#039;&#93;); 
$work1 = $target_name; 
$target = dirname(__FILE__).&#039;/uploads/&#039;.$target_name; 
switch($type) 
{ 
case &quot;image/jpeg&quot;: 
$resultImage = imagecreatefromjpeg($original); 
imagejpeg($resultImage, $target, $quality); 
break; 
case &quot;image/png&quot;: 
$resultImage = imagecreatefrompng($original); 
imagepng($resultImage, $target, $quality_png); 
break; 
case &quot;image/gif&quot;: 
$resultImage = imagecreatefromgif($original); 
imagegif($resultImage, $target, $quality); 
break; 
default : 
die(&quot;不支持此文件類型&quot;); 
exit; 
} 
$work1_small = $target_name; 
$target = dirname(__FILE__).&#039;/uploads/small/&#039;.$target_name; 
switch($type) 
{ 
case &quot;image/jpeg&quot;: 
$resultImage = imagecreatefromjpeg($original); 
imagejpeg($resultImage, $target, $quality2); 
break; 
case &quot;image/png&quot;: 
$resultImage = imagecreatefrompng($original); 
imagepng($resultImage, $target, $quality2_png); 
break; 
case &quot;image/gif&quot;: 
$resultImage = imagecreatefromgif($original); 
imagegif($resultImage, $target, $quality2); 
break; 
default : 
die(&quot;不支持此文件類型&quot;); 
exit; 
} 
} 
if(isset($_FILES&#91;&#039;work2&#039;&#93;) &amp;&amp; $_FILES&#91;&#039;work2&#039;&#93;&#91;&#039;error&#039;&#93;==0) 
{ 
$size = getimagesize($_FILES&#91;&#039;work2&#039;&#93;&#91;&#039;tmp_name&#039;&#93;); 
$original = $_FILES&#91;&#039;work2&#039;&#93;&#91;&#039;tmp_name&#039;&#93;; 
$type = $_FILES&#91;&#039;work2&#039;&#93;&#91;&#039;type&#039;&#93;; 
$target_name = date(&#039;YmdHis&#039;).&#039;_&#039;.preg_replace(&#039;`&#91;^a-z0-9-_.&#93;`i&#039;,&#039;&#039;,$_FILES&#91;&#039;work2&#039;&#93;&#91;&#039;name&#039;&#93;); 
$work2 = $target_name; 
$target = dirname(__FILE__).&#039;/uploads/&#039;.$target_name; 
switch($type) 
{ 
case &quot;image/jpeg&quot;: 
$resultImage = imagecreatefromjpeg($original); 
imagejpeg($resultImage, $target, $quality); 
break; 
case &quot;image/png&quot;: 
$resultImage = imagecreatefrompng($original); 
imagepng($resultImage, $target, $quality_png); 
break; 
case &quot;image/gif&quot;: 
$resultImage = imagecreatefromgif($original); 
imagegif($resultImage, $target, $quality); 
break; 
default : 
die(&quot;不支持此文件類型&quot;); 
exit; 
} 
$work2_small = $target_name; 
$target = dirname(__FILE__).&#039;/uploads/small/&#039;.$target_name; 
switch($type) 
{ 
case &quot;image/jpeg&quot;: 
$resultImage = imagecreatefromjpeg($original); 
imagejpeg($resultImage, $target, $quality2); 
break; 
case &quot;image/png&quot;: 
$resultImage = imagecreatefrompng($original); 
imagepng($resultImage, $target, $quality2_png); 
break; 
case &quot;image/gif&quot;: 
$resultImage = imagecreatefromgif($original); 
imagegif($resultImage, $target, $quality2); 
break; 
default : 
die(&quot;不支持此文件類型&quot;); 
exit; 
} 
} 
$sql=&quot;insert into photo(work_group,name,tel,id_card,work_name,place,work,work_small,date) values(&#039;$work_group&#039;,&#039;$name&#039;,&#039;$tel&#039;,&#039;$id_card&#039;,&#039;$work_name&#039;,&#039;$place&#039;,&#039;$work1&#039;,&#039;$work1_small&#039;,&#039;$date&#039;)&quot;; 
//echo $sql; 
$result = $connector -> query($sql) or die(mysql_error()); 
if($work2 != &quot;&quot; &amp;&amp; $work2_small != null) 
{ 
$sql2=&quot;insert into photo(work_group,name,tel,id_card,work_name,place,work,work_small,date) values(&#039;$work_group&#039;,&#039;$name&#039;,&#039;$tel&#039;,&#039;$id_card&#039;,&#039;$work_name&#039;,&#039;$place&#039;,&#039;$work2&#039;,&#039;$work2_small&#039;,&#039;$date&#039;)&quot;; 
$result2 = $connector -> query($sql2) or die(mysql_error()); 
} 
$connector -> close($connector); 
$page=&quot;../upload.php&quot;; 
echo &quot;<script>alert(&#039;上傳成功！&#039;); window.location = &#92;&quot;&quot;.$page.&quot;&#92;&quot;;</script>&quot;; 
?> 

有些問題需要說明下：
JPEG圖像生成的圖像的質(zhì)量的是一個(gè)范圍從0（最低質(zhì)量，最小的文件大小）到100（最高質(zhì)量，最大文件大?。?。而ImagePNG生成圖像的質(zhì)量范圍從0到9的，傳入的這個(gè)范圍以外的參數(shù)則該函數(shù)不會(huì)工作。
判斷上傳文件的類型，$type = $_FILES['work1']['type'];。
創(chuàng)建各種格式的圖片可以使用這些函數(shù)：imagecreatefromjpeg()、imagecreatefrompng()、imagecreatefromgif()。

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