PHP支持多种格式图片上传(支持jpg、png、gif)

发布时间：2020-12-13 06:01:10 所属栏目：PHP教程来源：网络整理

导读：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 div class="codetitle" a style="CURSOR: pointer" data="5932" class="copybut" id="copybut5932" onclick="doCopy('code5932')" 代

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
<div class="codetitle"><a style="CURSOR: pointer" data="5932" class="copybut" id="copybut5932" onclick="doCopy('code5932')"> 代码如下:<div class="codebody" id="code5932">
<?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;
$targetname = date('YmdHis').''.pregreplace('`[^a-z0-9-.]i','',$_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($resultImage,$quality_png); break; case "image/gif": $resultImage = imagecreatefromgif($original); imagegif($resultImage,$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($resultImage,$quality2); break; case "image/png": $resultImage = imagecreatefrompng($original); imagepng($resultImage,$quality2_png); break; case "image/gif": $resultImage = imagecreatefromgif($original); imagegif($resultImage,$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($resultImage,$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($resultImage,$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)
{
$sql2="insert into photo(work_group,'$work2','$work2_small','$date')";
$result2 = $connector -> query($sql2) or die(mysql_error());
}
$connector -> close($connector);
$page="../upload.php";
echo "";
?>

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()。

（编辑：李大同）

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