php-pack/data/functions.yml at b74a9652b86156d2db33c3c34be82d5659aa8bb2 · certificationy/php-pack · GitHub

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category: Functions
questions:
    -
        question: 'What is the best way to ensure that a user-defined function is always passed an object as its single parameter?'
        answers:
            - {value: 'function myfunction(stdClass $a)', correct: true}
            - {value: 'function myfunction($a = stdClass)', correct: false}
            - {value: 'Use is_object() within the function', correct: false}
            - {value: 'There is no way to ensure the parameter will be an object.', correct: false}
            - {value: 'function myfunction(Object $a)', correct: false}
    -
        question: |
                       What does the following function do, when passed two integer values for $p and $q?
                       function magic($p, $q) {
                            return ($q == 0) ? $p : magic($q, $p % $q);
                       }
        answers:
            - {value: 'Loops infinitely.', correct: false}
            - {value: 'Switches the values of $p and $q.', correct: false}
            - {value: 'Determines if they are both even or odd?', correct: false}
            - {value: 'Determines the greatest common divisor between them.', correct: true}
            - {value: 'Calculates the modulus between the two.', correct: false}
    -
        question: |
                       What would go in place of ?????? below to make this script execute without a fatal error?
                       $a = 1;
                       $b = 0;
                       /* ?????? */
                       $c = $a / $b;
        answers:
            - {value: 'quit();', correct: false}
            - {value: 'die();', correct: true}
            - {value: 'stop();', correct: false}
            - {value: '__halt_compiler();', correct: true}
            - {value: 'exit();', correct: true}
    -
        question: 'What is the difference between the ``include`` and ``require`` language constructs?'
        answers:
            - {value: 'Require constructs can''t be used with URL filenames', correct: false}
            - {value: 'Include constructs cause a fatal error if the file doesn''t exist', correct: false}
            - {value: 'There is no difference other than the name', correct: false}
            - {value: 'Include constructs are processed at run time; require constructs are processed at compile time', correct: false}
            - {value: 'Require constructs cause a fatal error if the file can''t be read', correct: true}
    -
        question: |
                       What would you replace ??????? with, below, to make the string Hello, World! be displayed?
                       function myfunction() {
                           /* ??????? */
                           echo $string;
                       }
                       myfunction("Hello, World!");
        answers:
            - {value: 'There is no way to do this.', correct: false}
            - {value: '$string = $argv[1];', correct: false}
            - {value: '$string = $_ARGV[0];', correct: false}
            - {value: 'list($string) = func_get_args();', correct: true}
            - {value: '$string = get_function_args();', correct: false}

    -
        question: |
                        What is the output of the following?
                        $a = 20;
                        function myfunction($b) {
                            $a = 30;

                            global $a, $c;
                            return $c = ($b + $a);
                        }
                        echo myfunction(40) + $c;
        answers:
            - {value: '120', correct: true}
            - {value: 'Syntax Error', correct: false}
            - {value: '60', correct: false}
            - {value: '70', correct: false}

    -
        question: |
                    What is the output of the following function?
                    function &find_variable(&$one, &$two, &$three) {
                        if ($one > 10 && $one < 20) return $one;
                        if ($two > 10 && $two < 20) return $two;
                        if ($three > 10 && $three < 20) return $three;
                    }
                    $one = 2;
                    $two = 20;
                    $three = 15;
                    $var = &find_variable($one, $two, $three);
                    $var++;
                    echo "1: $one, 2: $two, 3: $three";
        answers:
            - {value: '1: 2, 2: 20, 3: 15', correct: false}
            - {value: '1: 3, 2: 21, 3: 16', correct: false}
            - {value: '1: 2, 2: 21, 3: 15', correct: false}
            - {value: '1: 3, 2: 20, 3: 15', correct: false}
            - {value: '1: 2, 2: 20, 3: 16', correct: true}