Using Optional Parameters : Parameters « Functions « PHP






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Using Optional Parameters

 
<?php
$access = array('a', 'c', 'h', 'r', 'r');
$admin = array('e', 'q');

function check_access($username, $adminonly = false) {
    global $access, $admin;

    if (in_array($username, $admin)) {
        return true;
    }

    if (!($adminonly) && in_array($username, $access)) {
        return true;
    }

    return false;
}

echo check_access('r') ? 'is' : 'is NOT' ," allowed.</p>";
echo check_access('q') ? 'is' : 'is NOT' ," allowed.</p>";

echo check_access('r', true) ? 'is' : 'is NOT' ," an admin.</p>";
echo check_access('q', true) ? 'is' : 'is NOT' ," an admin.</p>";
?>








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7.Using a Function Call to Pass an Argument to a Function by Reference
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14.Changing argument values
15.Defining and Calling a two-argument function,
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18.Creating Functions That Take a Variable Number of Arguments
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20.Default Parameters
21.Define whether a variable is passed by value or reference
22.Passing By Reference
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