today i received a question from a user, the questions was:

can you show me how i can make all the letters in a sentence or words into small letter, by small letters i mean into lower case instead of capitalized or uppercase.

answer: to make all the content in s string to small case, simply use the strtolower() functiong:

example:
<?php
$foo= "This IS UPPER and lower is LOWER";
echo strtolower($foo);
?>


the output will be like this:
this is upper and lower is lower