Map.php

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<?php
/* vim: set expandtab tabstop=4 shiftwidth=4: */
//  
//  Copyright (c) 2003 Laurent Bedubourg
//  
//  This library is free software; you can redistribute it and/or
//  modify it under the terms of the GNU Lesser General Public
//  License as published by the Free Software Foundation; either
//  version 2.1 of the License, or (at your option) any later version.
//  
//  This library is distributed in the hope that it will be useful,
//  but WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
//  Lesser General Public License for more details.
//  
//  You should have received a copy of the GNU Lesser General Public
//  License along with this library; if not, write to the Free Software
//  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
//  
//  Authors: Laurent Bedubourg <laurent.bedubourg@free.fr>
//  
// $id$

define('ALGO_MAP_VERSION', '0.1.1');
       
function Algo_map()
{
    // we retrieve the list of map arguments
    $argv = func_get_args();
    // the first argument is the function name
    $func = array_shift($argv);

    if (is_object($func)) {
        // if first argument is an object, this map
        // has a callback to some method
        $obj  = $func;
        $func = array_shift($argv);     
    } else if (!function_exists($func)) {
        // if the function isn't defined,
        // we'll try to create the function
        // the first argument was the string
        // of function arguments(ie:'$a,$b,$c')

        // The code is the second argument
        $code = array_shift($argv);

        // We create the new function
        // it will be a lambda style function
        $func = create_function($func, $code);
    }

    // prepare the result array
    $result = array();

    // we'll apply the new function to
    // each element of arrays passed as
    // parameters
    while (count($argv[0]) > 0) {
        // prepare the array of arguments
        $fargs = array();
        
        for($i = 0; $i < count($argv); $i++) {
            // for each array to map
            // we add the next element of the
            // array to the argument array
            $fargs[] = array_shift($argv[$i]);
        }

        if (isset($obj)) {
            $result = array_merge($result,
                                  call_user_func_array(array($obj,$func),
                                                       $fargs));
        } else {
            // we merge the result of the function
            // with allready found results
            $result = array_merge($result,
                                  // call the function with the array
                                  // of arguments
                                  call_user_func_array($func, $fargs));
        }
    }

    // let's return the result array
    return $result;
}

?>

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