What is the strtolower method in PHP?

The strtolower method can convert all the alphabetical characters of the string to lowercase characters and returns the modified string as a new string.

Syntax

strtolower(string $string): string

Returns

This method returns a new string. The string passed as the argument remained unchanged.

Code

<?php 
    $str = "TEST_123";
    $str_lower = strtolower($str);
    echo "The lowercase value of ". $str. " is ". $str_lower. "\n";
    $str = "EDUcativE";
    $str_lower = strtolower($str);
    echo "The lowercase value of ". $str. " is ". $str_lower. "\n";
?>

Explanation

In the code above, we have used the strtolower method and converted the strings TEST_123 and EDUcativE to lowercase strings. The strtolower will convert.

Output

"TEST_123" to "test_123"
"EDUcativE" to "educative"

Refer here for more details.

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