1.2.1178. Substr() In Loops

Successive substr() calls may be replaced by a call to str_split().

It speeds up the processing, and allows the replacement of indefinite loops by a foreach() call.

This is a micro optimisation. It works better on longer strings.

<?php

    $bits = str_split($string, 5);
    foreach($bits as $bit) {
     foo($bit);
    }

    $i = 0;
    $s = strlen($string);
    while($i < $s) {
     // repeating calls to substr during the loop
     foo(substr($string, $i * 5, 5));
     $i += 5;
    }

?>

1.2.1178.1. Connex PHP features

• loop

1.2.1178.1.1. Suggestions

• Use str_split()

1.2.1178.1.2. Specs

Short name	Performances/SubstrInLoops
Rulesets	All, Changed Behavior, Performances
Exakat since	2.5.2
PHP Version	All
Severity	Minor
Time To Fix	Quick (30 mins)
Precision	Medium
Available in	Entreprise Edition, Exakat Cloud