1.2.1117. Should Use array_filter()¶
Should use array_filter().
array_filter() is a native PHP function, that extract elements from an array, based on a custom call. Using array_filter() shortens your code, and allows for reusing the filtering logic across the application, instead of hard coding it every time. array_filter() is faster than foreach() (with or without the isset() test) with 3 elements or more, and it is significantly faster beyond 5 elements. Memory consumption is the same.
<?php
$a = range(0, 10); // integers from 0 to 10
// Extracts odd numbers
$odds = array_filter($a, function($x) { return $x % 2; });
$odds = array_filter($a, 'odd');
// Slow and cumbersome code for extracting odd numbers
$odds = array();
foreach($a as $v) {
if ($a % 2) { // same filter than the closure above, or the odd function below
$bColumn[] = $v;
}
}
function foo($x) {
return $x % 2;
}
?>
See also array_filter.
1.2.1117.1. Suggestions¶
Use array_filter()
1.2.1117.2. Specs¶
Short name |
Php/ShouldUseArrayFilter |
Rulesets |
|
Exakat since |
1.0.7 |
PHP Version |
All |
Severity |
Minor |
Time To Fix |
Slow (1 hour) |
Precision |
Very high |
Examples |
|
Available in |