Is it possible to call multiple PHP scripts in parallel from a single PHP script?

To call multiple PHP scripts in parallel from a single PHP script, you can use PHP's `curl_multi_init()` function to send multiple HTTP requests concurrently. This allows you to execute multiple scripts simultaneously and handle their responses asynchronously. 

<?php
// List of URLs to call in parallel
$urls = [
    'http://example.com/script1.php',
    'http://example.com/script2.php',
    'http://example.com/script3.php',
];

// Initialize curl multi handle
$mh = curl_multi_init();

// Create individual curl handles for each URL
$ch = [];
foreach ($urls as $url) {
    $ch[$url] = curl_init($url);
    curl_setopt($ch[$url], CURLOPT_RETURNTRANSFER, true);
    curl_multi_add_handle($mh, $ch[$url]);
}

// Execute multiple requests in parallel
$active = null;
do {
    $mrc = curl_multi_exec($mh, $active);
} while ($mrc == CURLM_CALL_MULTI_PERFORM);

while ($active && $mrc == CURLM_OK) {
    if (curl_multi_select($mh) != -1) {
        do {
            $mrc = curl_multi_exec($mh, $active);
        } while ($mrc == CURLM_CALL_MULTI_PERFORM);
    }
}

// Retrieve and handle responses
foreach ($urls as $url) {
    $response = curl_multi_getcontent($ch[$url]);
    // Handle response for each script
    echo $response;
    curl_multi_remove_handle($mh, $ch[$url]);
    curl_close($ch[$url]);
}

// Close the multi handle
curl_multi_close($mh);
?>

Keywords

concurrent programming multi-threading parallel processing exec function asynchronous calls

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