String builder optimization (ARCH7071)

Key php.performance.string-builder-optimization · Severity info · Category performance

Retired

This rule has been retired and is no longer checked: the collector does not run it and no new finding carries this code. The page is kept for reference and for findings recorded before it was retired.

Chaining many parts with . in a single expression is hard to read and inefficient. Use a format string or implode() instead.

Incorrect

<?php
$line = $id . ' - ' . $name . ' (' . $age . ') ' . $city . ', ' . $country;
echo $line;

Correct

<?php
$line = sprintf('%d - %s (%d) %s, %s', $id, $name, $age, $city, $country);
echo $line;

Fix

Build multi-part strings with sprintf() or implode() in a single expression.