Description:
------------
Hi.


I have a question - is it the expected behaviour that lines like

strtolower($str);

Do not equals to

$str = strtolower($str);

?

The second line is correct and works fine, but first - is not. No errors produced, but also it just does not work :) $str most likely is being lowercased, but string $str stay untouched. The same is with other functions like

wordwrap($text, 20, "<br />\n");

Do not equals to

$newtext = wordwrap($text, 20, "<br />\n");



In all cases i expect, that action will be performed and string changes. However it does not happen.


Thanks in advance.

Test script:
---------------
<?php
$str = "Mary Had A Little Lamb and She LOVED It So";
$str = strtolower($str);
echo $str . PHP_EOL; // Prints mary had a little lamb and she loved it so
echo 'It works fine (all symbols are in lowercase)' . PHP_EOL;
?>
<?php
$str2 = "Mary Had A Little Lamb and She LOVED It So";
strtolower($str2);
echo $str2 . PHP_EOL; // Prints Mary Had A Little Lamb and She LOVED It So
echo 'It does not work (string is the same)' . PHP_EOL;
?>