PHP strtolower() Function

The PHP strtolower() function returns the string with all characters of the specified string in lowercase. Any symbol, space, special character or number in the string is ignored while applying this function. Only Alphabets are converted.

Note: Alphabet is determined by the current locale. For instance, in the default "C" locale characters such as umlaut-a (ä) will not be converted.

Note: This function is binary-safe.

Syntax

strtolower(string)

Parameters

string Required. Specify the string to convert

Return Value

Returns the lowercased version of the specified string.

Example:

The example below shows the usage of strtolower() function.

<?php
$MyString = "HeLLo John!";
$NewString = strtolower($MyString);

echo $MyString."\n";
echo $NewString."\n";
?>

The output of the above code will be:

HeLLo John!
hello john!

❮ PHP String Reference