PHP多种图片格式的简单上传

前言

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。

代码

<?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>";
?> 

说明

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