array_map.markdown.unfinished

# array_map

{{code:php
    // user defined function
    function mapLength($elt) {
       return strlen($elt);
    }
    $a = array('red', 'orange', 'blue');
    $result = array_map('mapLength', $a);
    var_export($result);
    // => array(0 => 3, 1 => 6, 2 => 4)


    function mapCountry($k, $v) {
       return array($k => $v);
    }
    // multiple arrays
    $a = array('Lisbon',   'Toronto', 'New York');
    $b = array('Portugal', 'Canada',  'USA');

    $result = array_map('mapCountry', $a, $b);
    var_export($result);
    // => array(0 => array('Lisbon' => 'Portugal'),
    //          1 => array('Toronto' => 'Canada'),
    //          2 => array('New York' => 'USA'))

    // default behavior using multiple arrays
    $result = array_map(null, $a, $b);
    var_export($result);
    // => array(0 => array(0 => 'Lisbon',   1 => 'Portugal'),
    //          1 => array(0 => 'Toronto'   1 => 'Canada'),
    //          2 => array(0 => 'New York', 1 => 'USA'))
}}

{{code:ruby
}}


{{related:
    array/array_filter        
    array/array_reduce   
    array/array_walk   
    function/create_function
}}