PHP strtoupper() and strtolower() string functions

Manipulating text or string data is such a common task that most all programming languages provide built-in functions for this specific purpose. PHP is no different in that regard. The language comes chock-full of different string manipulating functions. If you need string data in all capitalized or upper-cased letters, you can use strtoupper(). What about all lower-case strings? The strtolower() function takes of that. In this post, we visit some rudimentary examples and gain a feel for how these 2 functions operate.

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Below are some example uses of strtoupper() and strtolower(). Experiment with them on your particular string data to know for sure how they behave…

Lower-case, single word

$first_name = ‘josh’;
echo ‘strtoupper(): ‘.strtoupper($first_name);
echo ‘strtolower(): ‘.strtolower($first_name);
strtoupper(): JOSH
strtolower(): josh

All upper-case, single word