PHP 7.0.6 Released

    ReflectionFunctionAbstract::getNumberOfRequiredParameters

    (PHP 5 >= 5.0.3, PHP 7)

    ReflectionFunctionAbstract::getNumberOfRequiredParameters — Gets number of required parameters

    Description

    public int ReflectionFunctionAbstract::getNumberOfRequiredParameters ( void )

    Get the number of required parameters that a function defines.

    Warning

    This function is currently not documented; only its argument list is available.

    Parameters

    This function has no parameters.

    Return Values

    The number of required parameters.

    See Also

    User Contributed Notes

    sebastian at sebastian-eiweleit dot de
    2 years ago
    <?php
    namespace ExampleWorld;
    // The Class
    class helloWorld {
            /* Method with two required arguments */

            public function requiredTwoArguments ( $var1, $var2 ) {
                // Some code ...
            }

            /* Method with two arguments, but just one is required */
            public function requiredOneArgument ( $var1, $var2 = false ) {
                // Some code ...
            }
    }

    $r = new \ReflectionMethod ( 'ExampleWorld\helloWorld', 'requiredTwoArguments' );
    echo     $r->getNumberOfRequiredParameters ();

    $r = new \ReflectionMethod ( 'ExampleWorld\helloWorld', 'requiredOneArgument' );
    echo     $r->getNumberOfRequiredParameters ();

    // Output: 2 1
    cesar at magic3w dot com
    9 months ago
    It's interesting to note that this function will treat optional parameters that come before a required parameter as required too. This is good since it allows you to verify that the function will be receiving enough parameters for the it to work, regardless where they are located.

    <?php

    class MyTest() {
        public function     test($a = null, $b) {}
        public function     test2($a = null, $b, $c = null) {}
    }

    //Create the reflection
    $r  = new \ReflectionMethod('MyTest', 'test');
    $r2 = new \ReflectionMethod('MyTest', 'test2');

    //Verify the numbers
    echo 'Test: ' . $r->getNumberOfRequiredParameters()); //Output: 2
    echo 'Test2: ' . $r->getNumberOfRequiredParameters()); //Output: 2

    ?>
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