bwg

<?php

$iterations = 100000;

$value = [
    'one'   => 1, 
    'two'   => 2, 
    'three' => 3,
];

bwg

<?php

$iterations = 100000;

class zero {

    public static function one() {
        static $empties = [];

        $empty = &$empties[static::class];

bwg

PHP Version 5.4.30

-------------------------------------------------------
Testing 10 item array over 100,000 iterations:

isset                                   18.280982971191
array_key_exists                        96.060037612915
^E_NOTICE                               71.103811264038
-------------------------------------------------------
Testing 100 item array over 100,000 iterations:

bwg

PHP Version 5.4.30

--------------------------------------------------
Testing 0 char string over 100,000 iterations:

md5                           113.2709980011 ms
sha1                          117.16985702515 ms
crc32                         78.847885131836 ms
--------------------------------------------------
Testing 1 char string over 100,000 iterations:

bwg

PHP Version 5.4.29

--------------------------------------------------
Testing large_array over 100,000 iterations:

pass_by_ref                   95.081090927124 ms
pass_by_val                   86.126089096069 ms
--------------------------------------------------
Testing small_array over 100,000 iterations:

bwg

PHP Version 5.4.30

--------------------------------------------------
Testing 10 item array over 1,000 iterations:

serialize           2.1979808807373 ms
json_encode         1.3420581817627 ms
var_export          1.9409656524658 ms
msgpack_pack        1.5850067138672 ms
--------------------------------------------------

bwg

PHP Version 5.4.30

-------------------------------------------------------
Testing 10 item array over 1,000 iterations:

array_diff_key                          1.2109279632568
loop/unset                              0.87404251098633
-------------------------------------------------------
Testing 100 item array over 1,000 iterations:

bwg

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

bwg

PHP Version 5.6.11

--------------------------------------------------
Testing null over 100,000 iterations:

control                            16.100883483887
!$value                            22.799968719482
isset($value)                      21.697998046875
null !== $value                    22.647142410278
!empty($value)                     22.5830078125

bwg

<?php

abstract class Base {
    protected $name = 'Base';
}

class Foo extends Base {
    // defining $name here will properly fatal on access violation
    // protected $name = 'Foo';