is_array($value) vs (array) $value === $value (PHP 5.4.28)

arraycasttest

Lee@maverick ~$ php --version
PHP 5.4.28 (cli) (built: May  8 2014 10:11:53)
Copyright (c) 1997-2014 The PHP Group
Zend Engine v2.4.0, Copyright (c) 1998-2014 Zend Technologies
    with Xdebug v2.2.5, Copyright (c) 2002-2014, by Derick Rethans
Lee@maverick ~$ php arraycasttest.php
--------------------------------------------------
Testing null over 100,000 iterations:

is_array($value)              81.238031387329 ms
(array) $value === $value     20.181179046631 ms
--------------------------------------------------
Testing empty string over 100,000 iterations:

is_array($value)              80.595016479492 ms
(array) $value === $value     26.714086532593 ms
--------------------------------------------------
Testing string value over 100,000 iterations:

is_array($value)              80.502033233643 ms
(array) $value === $value     27.262926101685 ms
--------------------------------------------------
Testing empty array over 100,000 iterations:

is_array($value)              86.398124694824 ms
(array) $value === $value     21.799802780151 ms
--------------------------------------------------
Testing small array(5) over 100,000 iterations:

is_array($value)              84.192991256714 ms
(array) $value === $value     44.742107391357 ms
--------------------------------------------------
Testing med array(20) over 100,000 iterations:

is_array($value)              84.508895874023 ms
(array) $value === $value     106.16588592529 ms
--------------------------------------------------
Testing big array(100) over 100,000 iterations:

is_array($value)              90.351104736328 ms
(array) $value === $value     428.85708808899 ms
--------------------------------------------------
Testing huge array(1000) over 100,000 iterations:

is_array($value)              85.494041442871 ms
(array) $value === $value     4064.0630722046 ms

--------------------------------------------------
          average (ms)        total (ms)
--------------------------------------------------
is_array  84.160029888153     673.28023910522
cast      592.47326850891     4739.7861480713

arraycasttest.php

<?php

$iterations = 100000;

$values = [
    'null'             => null,
    'empty string'     => '',
    'string value'     => 'string',
    'empty array'      => [],
    'small array(5)'   => array_fill(0, 5, 'foo'),
    'med array(20)'    => array_fill(0, 20, 'foo'),
    'big array(100)'   => array_fill(0, 100, 'foo'),
    'huge array(1000)' => array_fill(0, 1000, 'foo'),
];

$totals = [
    'is_array' => 0,
    'cast'     => 0,
];

foreach ($values as $name => $value) {
    echo str_repeat('-', 50)."\n";

    echo "Testing {$name} over ".number_format($iterations)." iterations:\n\n";
    

    // -- is_array() ----------------------------------------------------------

    $start = microtime(true);

    for ($i = 0; $i < $iterations; $i++) {
    	$b = is_array($value);
    }

    $end = microtime(true);

    $duration = ($end - $start) * 1000;

    $totals['is_array'] += $duration;

    echo str_pad('is_array($value)', 30)."{$duration} ms\n";


    // -- (array) $value === $value -------------------------------------------

    $start = microtime(true);

    for ($i = 0; $i < $iterations; $i++) {
    	$b = (array) $value === $value;
    }

    $end = microtime(true);

    $duration = ($end - $start) * 1000;

    $totals['cast'] += $duration;

    echo str_pad('(array) $value === $value', 30)."{$duration} ms\n";
}

echo "\n".str_repeat('-', 50)."\n";
echo str_pad('', 10);
echo str_pad('average (ms)', 20);
echo str_pad('total (ms)', 20)."\n";
echo str_repeat('-', 50)."\n";

foreach ($totals as $name => $total) {
    echo str_pad($name, 10);
    echo str_pad($total/count($values), 20);
    echo str_pad($total, 20)."\n";
}

echo "\n";