CODEWITHSUNDEEP
phpcurllong-polling
user1032531
user1032531

Reputation: 26281

When should curl_close() be used?

The below script will operate indefinitely and will be initiated by using php myscript.php.

http://example.com/longpolling.php will only respond if it has something to communicate to php myscript.php, and the below curl request will timeout before longpolling.php will reach its time limitation.

Should I close and reopen the curl connection each loop, or keep it open indefinitely.

<?php
// php myscript.php
$options=[
    CURLOPT_URL=>'http://example.com/longpolling.php',
    CURLOPT_RETURNTRANSFER=>true,
    CURLOPT_CONNECTTIMEOUT => 300,
    CURLOPT_TIMEOUT=> 300
];
$ch      = curl_init();
curl_setopt_array( $ch, $options );
while (true) {
    $rsp = curl_exec( $ch );
    // Do something
    //curl_close( $ch );    //should I close and reopen?
}

Upvotes: 11

Views: 8563

Answers (2)

Alex Blex
Alex Blex

Reputation: 37018

You are missing the exit condition. Assuming it's a response from the remote script, the your code should be:

<?php
// php myscript.php
$options=[
    CURLOPT_URL=>'http://example.com/longpolling.php',
    CURLOPT_RETURNTRANSFER=>true,
    CURLOPT_CONNECTTIMEOUT => 300,
    CURLOPT_TIMEOUT=> 300
];
$ch      = curl_init();
curl_setopt_array( $ch, $options );
$rsp = false;
while (!$rsp) {
    $rsp = curl_exec( $ch );
} 
curl_close( $ch );   
// Do something

Upvotes: 0

secelite
secelite

Reputation: 1373

If the URLs are on the same server reusing the handle will lead to an increase in performance. cURL will reuse the same TCP connection for each HTTP request to the server.

Here is also a nice benchmark for this issue.

Upvotes: 7

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