test_explode_substr.php

<?php

// Made this on production grade server (PHP FPM 7.2 & 7.4) and local PHP CLI 7.4
// Solution 2 > Solution 1
// Local cli 7.4 : Did solution1 in 7.2129311561584 seconds. Did solution2 in 4.0765311717987 seconds.
// Server 7.2 FPM : Did solution1 in 9.0072309970856 seconds. Did solution2 in 4.500275850296 seconds.
// Server 7.4 FPM : Did solution1 in 8.1211979389191 seconds. Did solution2 in 4.0727269649506 seconds.

// example code
function microtime_float()
{
    list($usec, $sec) = explode(" ", microtime());
    return ((float)$usec + (float)$sec);
}

function solution1($text)
{
    for($i = 0; $i < 10000; $i++)
        list($username, $domain) = explode('@', $text);
}

function solution2($text)
{
    for($i = 0; $i < 10000; $i++) {
        $domain = substr($text, strpos($text, '@') +1 );
    }
}

$time_start = microtime_float();

for($i = 0; $i < 10000; $i++) {
    $text = "jeanmich".$i."@gmail".$i.".com";
    solution1($text);
}
$time_end = microtime_float();
$time = $time_end - $time_start;

echo "Did solution1 in $time seconds.\n";

$time_start = microtime_float();

for($i = 0; $i < 10000; $i++) {
    $text = "johndoe".$i."@domain".$i.".com";
    solution2($text);
}                                                                                                                                                                           $time_end = microtime_float();
$time = $time_end - $time_start;

echo "Did solution2 in $time seconds.\n";