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PHP has function system to make function work in php

Function is something like that you need to capitalize word all time in a program,so you don't want to write same code for capitalize word,if there any system you just call this and give input text for capitalize word

So your work will less than before

By function,you can do it

As which function comes from php,you can not change them is called built in function

Lets look an example of builtin function

<?php
echo ucfirst("tree")
?>

output:

Tree

So,here you see that first character of word is now capital letter,we use ucfirst function and this function task is to capitalize first character of word

This function comes from php,you don't have to create this,there are a lot of function from php,this type of function called builtin function

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