davepass Posted March 12, 2006 Share Posted March 12, 2006 I'd like to be able to find the entire key for a given value in a multi-dimensional array.So assuming an array named $structure with the following output:Array( [0] => Array ( [path] => ../content/about [name] => about [kind] => directory [content] => ) [1] => Array ( [path] => ../content/contact [name] => contact [kind] => directory [content] => ) [2] => Array ( [path] => ../content/resources [name] => resources [kind] => directory [content] => )}For example, I'd like to be able to feed the function the array name ($structure) and a value of "resources" and have it return "[2][name]".Here is what I have so far and I'm pretty stumped:[code]function getNavItemIndex($navItem, $haystack){ $arrStr = ""; foreach ($haystack as $k => $v) { if(is_array($v)) { getNavItemIndex($navItem, $v); } else { if ($v == $navItem) { $thisIndex = $k; break; } } } return $thisIndex;}[/code]I call the function on itself recursively because I'll never know how deep the array goes. So I just keep going through each one until the value is a string and not an array.I've got 2 problems:1. when I get a value for $thisIndex, it only reflects the key of the last array looped through. In the case of the example above it would be "name" rather than "[2][name]".2. Even if #1 were not an issue, the function always returns an empty string, even through $thisIndex can be printed out within the function... scope issue??Any help would be appreciated! Quote Link to comment https://forums.phpfreaks.com/topic/4738-function-to-return-keys-for-value-in-a-multi-dimensional-array/ Share on other sites More sharing options...
keeB Posted March 12, 2006 Share Posted March 12, 2006 both of the issues are scope issues... in each iteration you need to 'store' each value or 'do' something with it. Quote Link to comment https://forums.phpfreaks.com/topic/4738-function-to-return-keys-for-value-in-a-multi-dimensional-array/#findComment-16611 Share on other sites More sharing options...
davepass Posted March 12, 2006 Author Share Posted March 12, 2006 [!--quoteo(post=354124:date=Mar 12 2006, 03:04 AM:name=keeB)--][div class=\'quotetop\']QUOTE(keeB @ Mar 12 2006, 03:04 AM) [snapback]354124[/snapback][/div][div class=\'quotemain\'][!--quotec--]both of the issues are scope issues... in each iteration you need to 'store' each value or 'do' something with it.[/quote]I'm sorry. I don't really follow what you mean. Could you elaborate? Quote Link to comment https://forums.phpfreaks.com/topic/4738-function-to-return-keys-for-value-in-a-multi-dimensional-array/#findComment-16612 Share on other sites More sharing options...
keeB Posted March 12, 2006 Share Posted March 12, 2006 sorry. think of it this way..when you reutnr a value from a function inside of a loop, it will always only return the last value... Quote Link to comment https://forums.phpfreaks.com/topic/4738-function-to-return-keys-for-value-in-a-multi-dimensional-array/#findComment-16617 Share on other sites More sharing options...
greycap Posted March 12, 2006 Share Posted March 12, 2006 The problem is that you arent handling the case of when youve found the parent array. Youre only looking for correct values. You have to be able to single all the way up the stack that its succeeded.[code]function getNavItemIndex($navItem, $haystack){ $thisIndex = false; //default case foreach ($haystack as $k => $v) { if (is_array($v)) { $recurNdx = getNavItemIndex($navItem, $v); if ($recurNdx !== false) //found in recursive call return "[$k]$recurNdx"; } else if ($v == $navItem) //found here. return "[$k]"; } return $thisIndex;}[/code]Should return "[2][name]" Quote Link to comment https://forums.phpfreaks.com/topic/4738-function-to-return-keys-for-value-in-a-multi-dimensional-array/#findComment-16620 Share on other sites More sharing options...
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