<?php
require ("string.class.php");
$s = new String("Hello World !");
echo $s;
echo "<br>";
echo $s->toUpper();
echo "<br>";
echo $s->toLower();
echo "<br>";
echo $s->substr(0, 5)->length();
echo "<br>";
$h = new String("hello");
if ($s->substr(0, 5)->toLower() == $h) {
echo "it's hello";
}
echo "<br>";
if ($h->not("world")) {
echo "it's not world!";
}
echo "<br>";
$x = $s->concat(" yes ", $h);
echo $x;
echo "<br>";
echo ($x->toLower()->eq("hello world ! yes hello") ? "it's full lower!" : "not full lower");
?>
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