PHP支持多种格式图片上传(支持jpg、png、gif)

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
复制代码 代码如下:
<?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;不支持此文件类型&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, $quality2);
break;
default :
die(&quot;不支持此文件类型&quot;);
exit;
}
}
if(isset($_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;不支持此文件类型&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;不支持此文件类型&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);
$page=&quot;../upload.php&quot;;
echo &quot;<script>alert(&#039;上传成功！&#039;); window.location = &#92;&quot;&quot;.$page.&quot;&#92;&quot;;</script>&quot;;
?>

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()。