<?php
// Simple substring search benchmark
// https://gist.github.com/anthonyaxenov/045dac59676826236319199df1597bb5

$string = str_repeat('1', 100);
$max = 5000;
$results = [
    'preg_match_all' => [
        'total' => 0,
        'avg' => 0
    ],
    'substr_count' => [
        'total' => 0,
        'avg' => 0
    ],
    'count_chars' => [
        'total' => 0,
        'avg' => 0
    ],
];

for ($i = 0; $i < $max; ++$i) {
    $start = microtime(true);
    preg_match_all('/1/', $string);
    $results['preg_match_all']['total'] += round((microtime(true) - $start), 8);
}
$results['preg_match_all']['avg'] = round($results['preg_match_all']['total'] / $max, 8);

for ($i = 0; $i < $max; ++$i) {
    $start = microtime(true);
    substr_count($string, '1');
    $results['substr_count']['total'] += round((microtime(true) - $start), 8);
}
$results['substr_count']['avg'] = round($results['substr_count']['total'] / $max, 8);

for ($i = 0; $i < $max; ++$i) {
    $start = microtime(true);
    count_chars($string, 1);
    $results['count_chars']['total'] += round((microtime(true) - $start), 8);
}
$results['count_chars']['avg'] = round($results['count_chars']['total'] / $max, 8);

print_r($results);