php 根据字符串生成对应数组方法

<?php
$config = array(
    'project|page|index' => 'content',
    'project|page|nav' => array(
            array(
                'image' => '1.jpg',
                'name' => 'home'
            ),
            array(
                'image' => '2.jpg',
                'name' => 'about'
            )
    ),
    'project|page|open' => true
);
?>

<?php
$result = array(
    'project' => array(
        'page' => array(
            'index' => 'content',
            'nav' => array(
                    array(
                        'image' => '1.jpg',
                        'name' => 'home'
                    ),
                    array(
                        'image' => '2.jpg',
                        'name' => 'about'
                    )
            ),
            'open' => true
        )    
    )
);
?>

<?php
$config = array(
    'project|page|index' => 'content',
    'project|page|nav' => array(
            array(
                'image' => '1.jpg',
                'name' => 'home'
            ),
            array(
                'image' => '2.jpg',
                'name' => 'about'
            )
    ),
    'project|page|open' => true
);

$result = array();
foreach($config as $key=>$val){
    
    $tmp = '';
    $keys = explode('|', $key);
    
    for($i=0,$len=count($keys); $i<$len; $i++){
        $tmp .= "['".$keys[$i]."']";
    }
    
    if(is_array($val)){
        eval('$result'.$tmp.'='.var_export($val,true).';');
    }elseif(is_string($val)){
        eval('$result'.$tmp.'='.$val.';');
    }else{
        eval('$result'.$tmp.'=$val;');
    }

}

print_r($result);

?>

Array
(
    [project] => Array
        (
            [page] => Array
                (
                    [index] => content
                    [nav] => Array
                        (
                            [0] => Array
                                (
                                    [image] => 1.jpg
                                    [name] => home
                                )
                            [1] => Array
                                (
                                    [image] => 2.jpg
                                    [name] => about
                                )
                        )
                    [open] => 1
                )
        )
)