How to find key where value is array with certain key using php?

Question

For simple arrays with key value pairs, we can easily locate the key based on the value using array_search(). But I have an array in which the values may be a string or an array, and need to find the key where the value is an array with specific keys.

$myArray = array(
  0 => string_value,
  1 => string_value2,
  3 => array(
         'config' => array(
           'option1' => value1,
           'option2' => value2,
         ),
       ),
  4 => string_value3,
);

I need to find the key for the element where the child array has a key config -- i.e. I should search for config and return 3.

I'd prefer not to cycle through the array. Not a big deal if that's the only option. But I'm wondering if there's a more elegant way to locate that key.

If you already have a way of doing this (like iterating through all elements) and just wonder if there are a better way, I would recommend posting your working solution on Code Review instead. — M. Eriksson
– M. Eriksson, Commented Jan 7, 2017 at 14:48

LF-DevJourney · Accepted Answer · 2017-01-07 15:27:23Z

1

use array_filter to filter the array with config.

$o = array_filter($array, function($v){return !empty($v['config']) ? true : false;});
var_dump(array_keys($o));

answered Jan 7, 2017 at 15:27

LF-DevJourney

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1 Comment

lcdservices Over a year ago

This was definitely the most elegant solution.

Mohammad · Accepted Answer · 2017-01-07 14:48:52Z

0

You should iterate items of array and check value of every item in loop. Check if $item["config"] setted in loop, return index of loop item.

$index;
foreach ($myArray as $key => $item){
    if (isset($item["config"]))
        $index = $key;
}
echo $index;

See result of code in demo

answered Jan 7, 2017 at 14:48

Mohammad

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3 Comments

u_mulder Over a year ago

And add a break

Mohammad Over a year ago

@MagnusEriksson If $item['config'] allway is array, you can use is_array() but in question both of them work.

M. Eriksson Over a year ago

You are correct. I misread the question. He wants $item to be an array, not necessarily $item['config'].

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