(PHP 4 >= 4.3.0, PHP 5, PHP 7, PHP 8)
mb_strtolower — Make a string lowercase
$string, ?string $encoding = null): string
Returns string
with all alphabetic characters converted to lowercase.
stringThe string being lowercased.
encodingThe encoding
parameter is the character encoding. If it is omitted or null, the internal character
encoding value will be used.
string with all alphabetic characters converted to lowercase.
Example #1 mb_strtolower() example
<?php
$str = "Mary Had A Little Lamb and She LOVED It So";
$str = mb_strtolower($str);
echo $str; // Prints mary had a little lamb and she loved it so
?>
Example #2 mb_strtolower() example with non-Latin UTF-8 text
<?php
$str = "Τάχιστη αλώπηξ βαφής ψημένη γη, δρασκελίζει υπέρ νωθρού κυνός";
$str = mb_strtolower($str, 'UTF-8');
echo $str; // Prints τάχιστη αλώπηξ βαφής ψημένη γη, δρασκελίζει υπέρ νωθρού κυνός
?>
By contrast to strtolower(), 'alphabetic' is determined by the Unicode character properties. Thus the behaviour of this function is not affected by locale settings and it can convert any characters that have 'alphabetic' property, such as a-umlaut (ä).
For more information about the Unicode properties, please see » http://www.unicode.org/reports/tr21/.