Question

How to specify optional parameter values in PHP

Answer 1

// PHP does not support named parameters for functions. 
// However, you can use an array as argument for the function.

function default_values($arguments) {
    $defaults = array(
        'firstName' => 'Ally',
        'lastName' => 'Gator',
    );

    $arguments = array_merge($defaults, $arguments);

    echo $arguments['firstName'] . ' ' . $arguments['lastName'] . "\n";
}


default_values(array('lastName' => 'River'));
default_values(array('firstName' => 'July'));
default_values(array());


/*
run:

Ally River
July Gator
Ally Gator

*/

 

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Answer 2

// PHP does not support named parameters for functions. 
// However, you can use an array as argument for the function.

function default_values($arguments, $age) {
    $defaults = array(
        'firstName' => 'Ally',
        'lastName' => 'Gator',
    );

    $arguments = array_merge($defaults, $arguments);

    echo $arguments['firstName'] . ' ' . $arguments['lastName'] . ' ' . $age . "\n";
}


default_values(array('lastName' => 'River'), 40);
default_values(array('firstName' => 'July'), 50);
default_values(array(), 60);


/*
run:

Ally River 40
July Gator 50
Ally Gator 60

*/

 

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