Kode String PHP

Berikut daftar kode manipulasi string pada bahasa pemrograman PHP:
<?php
echo strlen("Hello world!"); // outputs 12
echo str_word_count("Hello world!"); // outputs 2
echo strrev("Hello world!"); // outputs !dlrow olleH
echo strpos("Hello world!", "world"); // outputs 6
echo str_replace("world", "Dolly", "Hello world!"); // outputs Hello Dolly!
// case-sensitive constant name
define("GREETING", "Welcome to W3Schools.com!");
echo GREETING;
?>