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$_FILES数组(HTTP文件上传变量)

PHP文件句柄如何知道一些基本信息，如文件名称、文件大小、文件类型以及已选择上传的文件的属性?让我们看看幕后发生了什么。

$_FILES是通过HTTP POST方法上传的二维关联全局项数组，它包含以下文件的属性:

Attribute	Description
[name]	Name of file which is uploading
[size]	Size of the file
[type]	Type of the file (like .pdf, .zip, .jpeg…..etc)
[tmp_name]	A temporary address where the file is located before processing the upload request
[error]	Types of error occurred when the file is uploading

现在看看这个数组是什么样的??

$_FILES[input-field-name][name]
$_FILES[input-field-name][tmp_name]
$_FILES[input-field-name][size]
$_FILES[input-field-name][type]
$_FILES[input-field-name][error]

让我们来看一些例子，在第一个例子中这个数组是如何工作的。

<?php

echo "<pre>";

print_r($_FILES);

echo "</pre>";

</form>

在上面的脚本中，在上传文件之前

一旦我们选择文件并上传，函数print_r将显示PHP超全局关联数组$_FILES的信息。

例2:添加html代码，后面跟着PHP脚本不同的文件。让我们制作一个用于上传文件的HTML表单 index.html

<!DOCTYPE html>

<html>

<head>

<title>GeeksForGeeks</title>

div

{

background: #4CB974;

text-align: center;

font-size: 20px;

padding: 30px;

color: #fff;

font-family: sans-serif;

}

</style>

</head>

<body>

<form action="file-upload-manager.php" method="post"

enctype="multipart/form-data" style="border: 1px solid #1f1f1f;

padding: 20px; position: absolute; top: 50%; left: 50%;

transform: translate(-50%, -50%);">

<!--multipart/form-data ensures that form

data is going to be encoded as MIME data-->

<h2>Upload File</h2>

<div> This Video is made for GFG</div>

</form>

</body>

</html>

现在，是时候编写一个能够处理文件上传系统的php脚本了。file-upload-manager.php

<?php

// Check if the form was submitted

if ($_SERVER["REQUEST_METHOD"] == "POST") {

// Check if file was uploaded without errors

if (isset($_FILES["photo"]) && $_FILES["photo"]["error"] == 0) {

$file_name = $_FILES["photo"]["name"];

$file_type = $_FILES["photo"]["type"];

$file_size = $_FILES["photo"]["size"];

$file_tmp_name = $_FILES["photo"]["tmp_name"];

$file_error = $_FILES["photo"]["error"];