What Are Internal Functions in PHP | PHP Tutorial | Learn PHP Programming | PHP for Beginners. In this PHP tutorial you will learn about “built-in functions/internal functions” which are ways for us to “do something/change” certain elements on our website. An example of an internal function, could be searching for a specific word or sentence inside a paragraph of text.
The following link is a list of built-in functions you can use: http://www.w3schools.com/php/php_ref_string.asp
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