How can PHP scripts efficiently check the availability of domains listed in a database to minimize server workload?

To efficiently check the availability of domains listed in a database and minimize server workload, you can use a multi-curl approach in PHP. This involves sending multiple HTTP requests simultaneously to check the availability of domains in parallel, reducing the overall execution time. 

<?php

// Function to check domain availability using cURL
function checkDomainAvailability($domain)
{
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $domain);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    $response = curl_exec($ch);
    $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
    curl_close($ch);
    
    if ($httpCode == 200) {
        return true; // Domain is available
    } else {
        return false; // Domain is not available
    }
}

// Array of domains to check
$domains = array("https://example1.com", "https://example2.com", "https://example3.com");

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

// Loop through each domain and add it to multi-curl
foreach ($domains as $domain) {
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $domain);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_multi_add_handle($mh, $ch);
}

// Execute multi-curl requests
$running = null;
do {
    curl_multi_exec($mh, $running);
} while ($running > 0);

// Check the availability of each domain
foreach ($domains as $domain) {
    if (checkDomainAvailability($domain)) {
        echo $domain . " is available." . PHP_EOL;
    } else {
        echo $domain . " is not available." . PHP_EOL;
    }
}

// Close multi-curl
curl_multi_close($mh);

?>

Keywords

PHP database domain availability server workload efficiency

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