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php method type hinting

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

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what is type-hinting in php

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

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php method type hinting

what is type-hinting in php

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