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PHP: strlen - Manual
PHP strlen() Function - W3Schools
PHP strlen(): Get the Length of a String in Bytes Examples
PHP: strlen - Manual - php.sh
strlen - Calcule la taille d'une chaîne - Le PHP Facile
PHP | String Functions | strlen() | Codecademy
PHP strlen() function explained with code examples | sebhastian
PHP’s strlen () Function: Measuring String Lengths
Fonction strlen() de PHP - oujood.com
PHP strlen() function - w3resource