PHP Uppercase & Lowercase

In this article, I will show you how to uppercase or lowercase a string in PHP. First of all, let’s see why is it required.

Why are PHP Uppercase & Lowercase functions required?

PHP uppercase or lowercase is required to achieve the following:

• To display data uniformly on webpage no matter how they are stored on back-end.
• To compare the string with another string in case of case insensitive scenario. Example: You have two strings, WEBOLUTE & Webolute. These 2 strings are same but they won’t match in mysql statement having LIKE attribute. To achieve this, you can lowercase both the strings and match them.

PHP Uppercase – strtoupper()

strtoupper( $str )

It converts all the characters of the string to upper-case.

Example:

<?php
    $str = "Programming is Interesting";
    $str = strtoupper($str);
    echo $str; // Output: PROGRAMMING IS INTERESTING
?>

PHP Lowercase – strtolower()

strtolower( $str )

It converts all the characters of the string to lower-case.

Example:

<?php
    $str = "Programming is Interesting";
    $str = strtolower($str);
    echo $str; // Output: programming is interesting
?>

Yes. It is as easy as it looks.