String Functions

PHP strtolower() Function

Topic: PHP String ReferencePrev|Next


The strtolower() function converts a string to lowercase.

The following table summarizes the technical details of this function.

Return Value: Returns the modified string.
Version: PHP 4+


The basic syntax of the strtolower() function is given with:


The following example shows the strtolower() function in action.

// Sample string
$str = "Hello WORLD!";

// Making the string lowercase
echo strtolower($str);

Here's a list of the functions related to strtolower() function:

  • lcfirst() – Converts the first character of a string to lowercase.
  • ucfirst() – Converts the first character of a string to uppercase.
  • ucwords() – Converts the first character of each word in a string to uppercase.
  • strtoupper() – Converts a string to uppercase.


The strtolower() function accepts the following parameters.

Parameter Description
string Required. Specifies the string to work on.
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