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Benchmarking "(array) $var === $var" vs "is_array($var)" for speed
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<?php | |
/** | |
* @param array $functions An associative array of closures to benchmark | |
* @param int $iterations The number of iterations | |
*/ | |
function benchmark($functions, $iterations) | |
{ | |
foreach ($functions as $name => $function) { | |
$start = microtime(true); | |
for ($i = 0; $i < $iterations; $i++) { | |
call_user_func($function); | |
} | |
$delta = microtime(true) - $start; | |
echo "$name: " . $delta . "\n"; | |
} | |
} | |
$data = array( | |
'string', // Not an array | |
array(1, 2, 3), // Small array | |
array_fill(1, 10000, uniqid()) // Large-ish array | |
); | |
$functions = array( | |
'casting' => function () use ($data) { | |
foreach ($data as $d) { | |
$result = (array) $d === $d; | |
} | |
}, | |
'is_array' => function () use ($data) { | |
foreach ($data as $d) { | |
$result = is_array($d); | |
} | |
} | |
); | |
echo "Benchmarking \"(array) \$var === \$var\" vs \"is_array(\$var)\" ...\n"; | |
benchmark($functions, 10000); |
Using the same benchmark function, comparing count($array) == 0
vs empty($array)
(less is better)
count(): 4.2716100215912
empty(): 3.3020689487457
<?php
// ...
echo "\nBenchmarking \"count(\$var) == 0\" vs \"empty(\$var)\" ...\n";
$data = range(1, 1000000);
benchmark(array(
'count()' => function () use ($data) {
$result = count($data) == 0;
},
'empty()' => function () use ($data) {
$result = empty($data);
}
), 10000000);
in_array_keys($key, $array)
vs $array[$key]
(less is better)
in_array_keys(): 4.8499279022217
key check: 3.8257780075073
<?php
// ...
echo "\nBenchmarking \"array_key_exists(\$key, \$array)\" vs \"\$array[\$key]\" ...\n";
$data = array_fill_keys(range(1, 1000), uniqid());
benchmark(array(
'in_array_keys()' => function () use ($data) {
$result = array_key_exists(50, $data) ? : null;
},
'key check' => function () use ($data) {
$result = $data[50] ? : null;
}
), 10000000);
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Results on an iMac 2.7 GHz Intel Core i5 with 12GB RAM with PHP 5.4 (less is better)
casting: 6.4870979785919
is_array: 0.010051012039185