1.2.71. Avoid array_unique()¶
The native function array_unique() is much slower than using other alternatives, such as array_count_values(), array_flip()/array_keys(), or even a foreach() loops.
<?php
// using array_unique()
$uniques = array_unique($someValues);
// When values are strings or integers
$uniques = array_keys(array_count_values($someValues));
$uniques = array_flip(array_flip($someValues))
//even some loops are faster.
$uniques = [];
foreach($someValues as $s) {
if (!in_array($uniques, $s)) {
$uniques[] $s;
}
}
?>
See also array_unique..
1.2.71.1. Suggestions¶
Upgrade to PHP 7.2
Use an alternative way to make values unique in an array, using array_count_values(), for example.
1.2.71.2. Specs¶
Short name |
Structures/NoArrayUnique |
Rulesets |
|
Exakat since |
0.8.4 |
PHP Version |
With PHP 7.2 and older |
Severity |
Minor |
Time To Fix |
Quick (30 mins) |
Precision |
Very high |
Features |
array |
Available in |