On 11-12-14 01:11 AM, Laruence wrote:
On Wed, Dec 14, 2011 at 9:27 AM, Nils Leideck<nils.leid...@leidex.net> wrote:
Hi Al,
many thanks for your feedback. Unfortunately I don’t know the deepness of the
array so I can’t use the nested foreach() idea :-( Let me try to simplify my
question (which also helps myself to clarify my process ;-)
I have a variable where the value is a string that is exactly the path to the
array value:
[code]
$arrayPath = "['user_interface’][‘design']['my_colors']['item_number_one’]”;
[/code]
And I have an array that has all the details:
[code]
$myArray = coolFunction(‘getArray’);
[/code]
The question is, how can I use these both informations to return a value from
the $myArray?
Examples I tried unsuccessfully:
[code]
[...]
echo $myArray$arrayPath;
echo $myArray{$arrayPath};
echo $myArray${arrayPath};
echo $myArray${$arrayPath};
echo $myArray.$arrayPath;
echo $myArray.$arrayPath;
[...]
[/code]
etc...
your feedback is much much much appreciated!!!
Cheers, Nils
--
http://webint.cryptonode.de / a Fractal project
for you quesion, try eval:
<?php
$arr = array("a"=>array("b"=>array("c")));
$key = "['a']'['b]";
$value = eval("return \$arr". $key .";");
?>
ps: your requirement is a little odd :)
If the solution is to use eval() then you've almost certainly come up
with the wrong answer.
To get the desired answer you can either use recursion to recursively
index the array as necessitated by the "path" or you can use references
to incremententally step through the array. Example:
<?php
$path = 'path/to/data/in/my/arbitrarily/deep/array';
$array = $someBigFatArray;
$focus = &$array();
foreach( explode( '/', $path ) as $step )
{
if( isset( $focus[$step] ) )
{
$focus = &$focus[$step];
}
else
{
unset( $focus );
$focus = null;
break;
}
}
echo $focus;
?>
You can wrap this puppy in a function too... and it will be faster than
the recursive version someone else wrote because it doesn't incur the
overhead of multiple function calls (for depths greater than 1).
Recursion is great, recursion is elegant, computer science professors
love recursion, but it can also be a resource pig and PHP doesn't do
tail recursion :)
Cheers,
Rob.
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