PHP implements the function of uploading files through CURL

This article mainly introduces the function of uploading files through CURL in PHP, and analyzes the related attribute settings and usage skills of PHP using curl file upload operation in the form of examples. Friends in need can refer to the following

The examples of this article are described Use PHP to implement the function of uploading files through CURL. Share it with everyone for your reference. The details are as follows:

PHP uses CURL to upload files. Just send a POST request. Set a certain field in the request to the full path of the file that needs to be uploaded, and start with "@ ", and then use CURL to send the variable to the server in POST mode. The corresponding uploaded file information can be obtained from the super global variable $_FILES on the server side.

Below we use an example to show this process.

Assume that there is a text file log.txt locally, its path is "/www/test/log.txt", and the content is as follows:

this is a file for test
hello PythonTab!

In order to upload this file to the server-side script http://www.php.cn/article.html, we wrote a local script named curl_file.php with the following content:

## The logic of #

<?php
$url = "http://www.php.cn/article.html";
$post_data = array(
"foo" => "bar",
//要上传的本地文件地址
"upload" = > "@/www/test/log.txt"
);
$ch = curl_init();
curl_setopt($ch , CURLOPT_URL , $url);
curl_setopt($ch , CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch , CURLOPT_POST, 1);
curl_setopt($ch , CURLOPT_POSTFIELDS, $post_data);
$output = curl_exec($ch);
curl_close($ch);
echo $output;
?>

$post_data, where upload points to the file that needs to be sent. It should be noted here that when we used POST before, we sent a string, and then used file_get_contents("php//input") on the server side to get the string. The usage here is different. In fact, POST You can also send key-value pairs like GET. There is a super global variable $_POST on the server side that can obtain the value of the corresponding POST data just like $_GET. It should be noted that the variable for uploading files does not exist in $_POST, but in $_FILES.

<?php
echo var_export($_FILES,true);
echo file_get_contents($_FILES[&#39;upload&#39;][&#39;tmp_name&#39;]);
copy($_FILES[&#39;upload&#39;][&#39;tmp_name&#39;], "./log_copy.txt");
?>

var_export to output the $_FILES variable to standard output, and then uses file_get_contents to read $_FILES['upload'][ 'tmp_name'] and output the contents of the file to standard output, and then copy the file named $_FILES['upload']['tmp_name'] to log_copy.txt in the current directory. in the file. The standard output of the script is as follows:

array(
'upload' =>
array(
'name' => 'log.txt',
'type' => 'application/octet-stream',
'tmp_name' => '/tmp/phpLUB59F',
'error' => 0,
'size' => 36,
)
)
this is a file for test
hello PythonTab!

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