Some Array Functions

gistfile1.js

in_array = function(needle, haystack, argStrict) {
        // Checks if the given value exists in the array
        var found = false,
            key, strict = !! argStrict;

        for (key in haystack) {
            if ((strict && haystack[key] === needle) || (!strict && haystack[key] == needle)) {
                found = true;
                break;
            }
        }

        return found;
    }

    /* http://phpjs.org/ */
    array_push = function(array) {
        // Pushes elements onto the end of the array
        var i, argv = arguments,
            argc = argv.length;

        for (i = 1; i < argc; i++) {
            array[array.length++] = argv[i];
        }

        return array.length;
    }

    /* http://phpjs.org/ */
    array_shift = function(array) {
        // Pops an element off the beginning of the array
        if (array.length > 0) {
            return array.shift();
        }

        return null;
    }

    array_pop = function(array) {
        // Pops an element off the end of the array
        var key = '',
            cnt = 0;

        if (array.hasOwnProperty('length')) {
            // Indexed
            if (!array.length) {
                // Done popping, are we?
                return null;
            }
            return array.pop();
        } else {
            // Associative
            for (key in array) {
                cnt++;
            }
            if (cnt) {
                delete (array[key]);
                return array[key];
            } else {
                return null;
            }
        }
    }

    array_unshift = function(array) {
        // Pushes elements onto the beginning of the array
        var argc = arguments.length,
            argv = arguments,
            i;

        for (i = 1; i < argc; i++) {
            array.unshift(argv[i]);
        }

        return (array.length);
    }