Online PHP editor | output for M08qg

@ 2020-07-29T14:31:07Z

<?php

function benchmark(string $name, callable $callback) {
    $string = ')(8234@#$ABCFG3478&* hello';

    $time = microtime(true);
    
    for ($i = 0; $i < 500_000; ++$i) {
        $callback($string);
    }
    
    $time = microtime(true) - $time;
    
    echo number_format($time, 6), 's: ', $name, ' (result: ', $callback($string), ")\n";
}

benchmark('preg', function (string $string) {
    $firstLetter = null;
    
    if (preg_match('/[a-z0-9]/i', $string, $match)) {
        $firstLetter = $match[0];
    }

    return $firstLetter;
});

benchmark('ctype_alnum', function (string $string) {
    $length = strlen($string);
    $firstLetter = null;
    
    for ($i = 0; $i < $length; ++$i) {
        if (ctype_alnum($string[$i])) {
            $firstLetter = $string[$i];
            break;
        }
    }
    
    return $firstLetter;
});

benchmark('strcspn', function (string $string) {
    return $string[strcspn($string, "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789")] ?? null;
});

Output for 7.4.8: 0.109207s: preg (result: 8) 0.097710s: ctype_alnum (result: 8) 0.171330s: strcspn (result: 8)
Output for 7.4.7: 0.112319s: preg (result: 8) 0.095006s: ctype_alnum (result: 8) 0.176000s: strcspn (result: 8)
Output for 7.4.6: 0.113054s: preg (result: 8) 0.096397s: ctype_alnum (result: 8) 0.175261s: strcspn (result: 8)
Output for 7.4.5: 0.110904s: preg (result: 8) 0.100424s: ctype_alnum (result: 8) 0.175249s: strcspn (result: 8)
Output for 7.4.4: 0.127381s: preg (result: 8) 0.098528s: ctype_alnum (result: 8) 0.168418s: strcspn (result: 8)
Output for 7.4.3: 0.108616s: preg (result: 8) 0.092715s: ctype_alnum (result: 8) 0.171960s: strcspn (result: 8)
Output for 7.4.2: 0.121002s: preg (result: 8) 0.118969s: ctype_alnum (result: 8) 0.209604s: strcspn (result: 8)
Output for 7.4.1: 0.117536s: preg (result: 8) 0.097046s: ctype_alnum (result: 8) 0.167549s: strcspn (result: 8)
Output for 7.4.0: 0.107974s: preg (result: 8) 0.094272s: ctype_alnum (result: 8) 0.174642s: strcspn (result: 8)
Output for 7.2.0 - 7.2.32, 7.3.0 - 7.3.20: Parse error: syntax error, unexpected '_000' (T_STRING), expecting ';' in /in/M08qg on line 8
Process exited with code 255.

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