PHP strlen() Function

Return the length of the string "Hello":

<?php
echo strlen("Hello");
?>

Definition and Usage

The strlen() function returns the length of a string.

strlen(string)

Parameter	Description
string	Required. Specifies the string to check

Return Value:	Returns the length of a string (in bytes) on success, and 0 if the string is empty
PHP Version:	4+

Return the length of the string "Hello World":

<?php
echo strlen("Hello world!");
?>