what is type hinting in php

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1<?php	// use type hinting to specify the expected data type of an argument
2function startParty(array $guests, array $food = null) {
3    // party stuff...
4}
5$guests = array("Susan Foreman", "Sarah Jane Smith");
6startParty($guests, null);
7?>

1Apparently 'type hinting' in PHP can be defined as
2follows: "Type hinting" forces you to only pass objects 
3of a particular type. This prevents you from 
4passing incompatible values, and creates a standard 
5if you're working with a team

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