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为什么getimagesize()函数对于传递的不同参数[来自$\u文件超全局数组的索引]表现不同?

getimagesize superglobals image-uploading file-upload php

-1

PHPFan · 技术社区 · 7 年前

在获得用户上传到服务器的图像大小之前,我还有一个用PHP编写的不完整代码。

HTML表单代码:

<!DOCTYPE html>
<html>
<body>

<form action="upload.php" method="post" enctype="multipart/form-data">
    Select image to upload:
    <input type="file" name="fileToUpload" id="fileToUpload">
    <input type="submit" value="Upload Image" name="submit">
</form>

</body>
</html>

<?php
$target_dir = "C:/xampp/htdocs/php_playground/uploads/";
$target_file = $target_dir . basename($_FILES["fileToUpload"]["name"]);
$uploadOk = 1;
$imageFileType = pathinfo($target_file,PATHINFO_EXTENSION);
// Check if image file is a actual image or fake image
if(isset($_POST["submit"])) {
    $check = getimagesize($_FILES["fileToUpload"]["tmp_name"]);
    echo "Check Value with tmp_name parameter : \n";
    echo "<pre>";
    print_r($check); 
    echo "</pre>";
    die;
}
?>

PHP代码1的输出如下:

Check Value with tmp_name parameter :

Array
(
    [0] => 1536
    [1] => 2048
    [2] => 2
    [3] => width="1536" height="2048"
    [bits] => 8
    [channels] => 3
    [mime] => image/jpeg
)

PHP代码2:

 <?php
    $target_dir = "C:/xampp/htdocs/php_playground/uploads/";
    $target_file = $target_dir . basename($_FILES["fileToUpload"]["name"]);
    $uploadOk = 1;
    $imageFileType = pathinfo($target_file,PATHINFO_EXTENSION);
    // Check if image file is a actual image or fake image
    if(isset($_POST["submit"])) {
        $check = getimagesize($_FILES["fileToUpload"]["name"]);
        echo "Check Value with name parameter : \n";
        echo "<pre>";
        print_r($check); 
        echo "</pre>";
        die;
    }
    ?>

PHP代码2的输出如下:

:getimagesize(demo\u image.jpg):无法打开流:中没有此类文件或目录 C: \xampp\htdocs\php\u playfield\uploads\upload。php 8.

使用名称参数检查值:

getimagesize() $_FILES 大堆

请在这方面指导我。