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curl_multi_add_handle

(PHP 5, PHP 7)

curl_multi_add_handleAdd a normal cURL handle to a cURL multi handle

Description

int curl_multi_add_handle ( resource $mh , resource $ch )

Adds the ch handle to the multi handle mh

Parameters

mh

A cURL multi handle returned by curl_multi_init().

ch

A cURL handle returned by curl_init().

Return Values

Returns 0 on success, or one of the CURLM_XXX errors code.

Examples

Example #1 curl_multi_add_handle() example

This example will create two cURL handles, add them to a multi handle, and process them asynchronously.

<?php
// create both cURL resources
$ch1 curl_init();
$ch2 curl_init();

// set URL and other appropriate options
curl_setopt($ch1CURLOPT_URL"http://www.example.com/");
curl_setopt($ch1CURLOPT_HEADER0);
curl_setopt($ch2CURLOPT_URL"http://www.php.net/");
curl_setopt($ch2CURLOPT_HEADER0);

//create the multiple cURL handle
$mh curl_multi_init();

//add the two handles
curl_multi_add_handle($mh,$ch1);
curl_multi_add_handle($mh,$ch2);

$running=null;
//execute the handles
do {
    
curl_multi_exec($mh,$running);
} while(
$running 0);

//close all the handles
curl_multi_remove_handle($mh$ch1);
curl_multi_remove_handle($mh$ch2);
curl_multi_close($mh);
?>

See Also

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User Contributed Notes 3 notes

up
3
3315954155 at libero dot it
4 months ago
Sometime with arrays and loops (i.e. for or do while or foreach) curl_multi_init  loses some hits, to work around this problem  it is necessary to divide the loop into two parts: the start with key number zero and than, all the rest. In this way the curl_multi_init doesn't lose any hits. I did a lot of test and it seems to work well enough.
<?php

function set_option($x, $y){
curl_setopt($x, CURLOPT_URL$y);
curl_setopt($x, CURLOPT_HEADER, 0);
curl_setopt($x, CURLOPT_FOLLOWLOCATION, TRUE);
curl_setopt($x, CURLOPT_RETURNTRANSFER, TRUE);
curl_setopt($x, CURLOPT_ENCODING, "gzip,deflate");
}

$nodes = array('http://php.net/manual/it/function.curl-multi-add-handle.php',
'http://php.net/manual/en/function.curl-multi-init.php',
'http://php.net/manual/en/function.curl-multi-setopt.php'
);

$node_count = count($nodes);

$curl_arr = array();
$master = curl_multi_init();
/*
now I put the first part of the array with the start key number zero, add all    
options and add the curl_multi_add_handle;                                              
it is necessary to detach this first part to avoid to lose some handles and than running
the loop with the start key number one.                                                 
In this way the curl_multi_init doesn't lose anything and seems to be very stable.      
*/  
   
$curl_arr[0] = curl_init($nodes[0]);
   
set_option($curl_arr[0], $nodes[0]);
   
curl_multi_add_handle($master, $curl_arr[0]);
   

/* 
now the loop can start with key number one                             
*/
$i = 1;
do {
    if (
$i!==0){

   
$curl_arr[$i] = curl_init($nodes[$i]);
   
set_option($curl_arr[$i], $nodes[$i]);
   
curl_multi_add_handle($master, $curl_arr[$i]);
    }
$i++;   
}while(
$i < $node_count);

$running = NULL;
do {
   
curl_multi_exec($master,$running);
} while(
$running);

$results = array();
$q = 0;
do{
$results[$q] = curl_multi_getcontent($curl_arr[$q]);
curl_multi_remove_handle($master, $curl_arr[$q]);
$q++;   
}while(
$q < $node_count);

foreach(
$results as $value){
echo
$value;
}

?>
up
6
Anonymous
5 years ago
The 'do' loop in this example will cycle indefinitely until all curl downloads complete, needlessly using CPU cycles.  A much better way is to block while dowloads are in progress.  Refer to the example code on the curl_multi_exec() page instead, which does this!
up
-1
kamsamlt888 at gmail dot com
8 months ago
$nodes = array('http://www.google.com', 'http://www.microsoft.com', 'http://yahoo.com');
$node_count = count($nodes);

$curl_arr = array();
$master = curl_multi_init();

for($i = 0; $i < $node_count; $i++)
{
    $url =$nodes[$i];
    $curl_arr[$i] = curl_init($url);
    curl_setopt($curl_arr[$i], CURLOPT_RETURNTRANSFER, true);
    curl_multi_add_handle($master, $curl_arr[$i]);
}

do {
    curl_multi_exec($master,$running);
} while($running > 0);

echo "results: ";
for($i = 0; $i < $node_count; $i++)
{
    $results = curl_multi_getcontent  ( $curl_arr[$i]  );
    echo( $i . "\n" . $results . "\n");
}
echo 'done';
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