Considering $vars
being your variables you would like to get one['one-one']
or two['two-two']['more']
from (Demo):
$vars = function($str) use ($vars)
{
$c = function($v, $w) {return $w ? $v[$w] : $v;};
return array_reduce(preg_split('~\[\'|\'\]~', $str), $c, $vars);
};
echo $vars("one['one-one']"); # hello
echo $vars("two['two-two']['more']"); # tea-time!
This is lexing the string into key tokens and then traverse the $vars
array on the keyed values while the $vars
array has been turned into a function.
Older Stuff:
Overload the array with a function that just eval’s:
$vars = array(
'one' => array(
'one-one' => "hello",
'one-two' => "goodbye"
),
'two' => array(
'two-one' => "foo",
'two-two' => "bar"
)
);
$vars = function($str) use ($vars)
{
return eval('return $vars'.$str.';');
};
echo $vars("['one']['one-two']"); # goodbye
If you’re not a fan of eval, change the implementation:
$vars = function($str) use ($vars)
{
$r = preg_match_all('~\[\'([a-z-]+)\']~', $str, $keys);
$var = $vars;
foreach($keys[1] as $key)
$var = $var[$key];
return $var;
};
echo $vars("['one']['one-two']"); # goodbye