array_search not working in multi dimensional array as expected

Question

I have the following array (array below) and I am trying to get the key of the value of the sub-array.

$array = array(
  'USD' => array (
      0 => 1.79,
      1 => 3.58,
      2 => 5.37,
      3 => 7.16,
      4 => 8.95,
    ),
  'CAD' =>  array (
      0 => 2.49,
      1 => 4.98,
      2 => 7.47,
      3 => 9.96,
      4 => 12.45,
    ),
  'EUR' =>  array (
      0 => 1.99,
      1 => 3.98,
      2 => 5.97,
      3 => 7.96,
      4 => 9.95,
    )
);  
$item_to_get = array_search(5.97, $array);

CURRENT OUTPUT

false

EXPECTED OUTPUT => the parent key name

EUR

I think array_search works only on one dimensional array...btw what happen if multiple value are the same?? — Andrew
– Andrew, Commented Nov 28, 2015 at 15:15
The result is exactly as expected considering the documentation of the function: it searches through the values inside the array, not throught the elements of the arrays values. — arkascha
– arkascha, Commented Nov 28, 2015 at 15:15
And in order to achieve expected output, i ran out of ideas. — Adrian
– Adrian, Commented Nov 28, 2015 at 15:16
Duplicate of: stackoverflow.com/questions/28472779/recursive-array-search — arkascha
– arkascha, Commented Nov 28, 2015 at 15:18
@arkascha Worked fine with a bit of adapting sandbox.onlinephpfunctions.com/code/… — Adrian
– Adrian, Commented Nov 28, 2015 at 15:33

webdeb · Accepted Answer · 2015-11-28 15:18:06Z

2

array_search function is not recursive, so you have to iterate over the array and search in the subarrays:

$foundInParent = false;
foreach($array as $parentKey => $subArray) {
  if (array_search(5.97, $subArray)) {
    $foundInParent = $parentKey;
    break;
  }
}

echo $foundInParent;

Just wrap it in a function..

answered Nov 28, 2015 at 15:18

webdeb

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4 Comments

Adrian Over a year ago

I get null sandbox.onlinephpfunctions.com/code/…

webdeb Over a year ago

@Adrian you need to RETURN the value ;) sandbox.onlinephpfunctions.com/code/…

Adrian Over a year ago

Ah Yes, wasn't attentive.

webdeb Over a year ago

@Adrian just a tip, when you create a function first define the return value and put the return statement at the end.. and then start writing your logic in between..

Thomas Landauer · Accepted Answer · 2015-11-28 15:17:07Z

0

This is not the way array_search() is supposed to work - see here: http://php.net/manual/en/function.array-search.php

You probably need array_walk() with a custom callback function. Or use foreach() to iterate over the outer array, then array_search() inside the foreach-loop.

I any case, I recommend setting up the array differently in the first place!

answered Nov 28, 2015 at 15:17

Thomas Landauer

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