1.2.757. Nested Loops

Nested loops happens when a loop (while, do..while, for, foreach), is used inside another loop.

Such structure tends to require a lot of processing, as the size of both loops have to be multiplied to estimate the actual payload. They should be avoided as much as possible. This may no be always possible, though.

Nested loops are worth a check for performances reasons, as they will process a lot of times the same instructions.

<?php

// Nested loops
foreach($array as $a) {
    foreach ($letters as $b) {
        // This is performed count($array) * count($letters) times.
        doSomething();
    }
}

?>

1.2.757.1. Specs

Short name	Structures/NestedLoops
Rulesets	All, Appinfo, CE, Performances
Exakat since	0.8.4
PHP Version	All
Severity	Minor
Time To Fix	Slow (1 hour)
Precision	Very high
Features	nesting
Available in	Entreprise Edition, Community Edition, Exakat Cloud