<?php
//ucfirst - pierwsza litera wielka
$foo = 'hello world!';
$foo = ucfirst($foo); // Hello world!
//mb_strtolowe - wielkie litery na male
$str = "Mary Had A Little Lamb";
$str = mb_strtolower($str); // mary had a little lamb
//mb_strtoupper - male litery na wielkie
$str = "Mary Had A Little Lamb";
$str = mb_strtolower($str); // MARY HAD A LITTLE LAMB
//str_replace - zamienia wszystkie znaki, ktore wystapily w pierwszym parametrze, na znaki w drugim parametrze
$str = "Znak +";
$str = str_replace('+','plusa', $str); // Znak plusa
?>
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