Extract equal values for multidimensional array in php

Question

I have this problem. I have a multidimensional json array (don't ask - legacy code). I convert it to PHP array. I need to extract all KEYS that have EQUAL VALUE (in my case "666"). I need each key to be assign to a SEPARATE variable. In my code I succeeded to fetch the keys but I can assign them only to another array or all at once to a single variable. Please HELP!!!

Love V

Here is the code:

<?php
//user input
$in = "666";

$outputZ = '[
{"record_id_001":"1"},
{"record_id_002":"13"},
{"record_id_003":"666"},
{"record_id_004":"72661781"},
{"record_id_005":"8762"},
{"record_id_006":"666"},
{"record_id_007":"8762"},
{"record_id_008":"666"},
{"record_id_009":"8762"},
{"record_id_010":"8762"},
{"record_id_011":"666"}
]';

//convert json to php array
//someArray = json_decode($someJSON, true);
$decoZ = json_decode($outputZ, true);

// TESTING (move to comment latter)
//print_r ($decoZ);

//loop through each array an check for user input
//way 1: assign to new array
foreach($decoZ as $array => $number)
foreach($number as $key => $value)
    if (in_array("$in", $number)) {
        $var = $key;
        $getarray = "'" . $var . "'";
        $recnumber = array($getarray);
        print_r ($recnumber);
        }

//way 2: assign to variable 
foreach($decoZ as $array => $number)
foreach($number as $key => $value)
    if (in_array("$in", $number)) {
        $var = $key;
        echo "$var" . " ";
        }
?>

Answer 1

You're overwritting your array on each iterations $recnumber = array($getarray);

I would rather follow this logic :

<?php
//user input
$in = "666";

$outputZ = '[
{"record_id_001":"1"},
{"record_id_002":"13"},
{"record_id_003":"666"},
{"record_id_004":"72661781"},
{"record_id_005":"8762"},
{"record_id_006":"666"},
{"record_id_007":"8762"},
{"record_id_008":"666"},
{"record_id_009":"8762"},
{"record_id_010":"8762"},
{"record_id_011":"666"}
]';

$decoZ = json_decode($outputZ, true);


// create empty array
$recnumber = [];
foreach($decoZ as $record)
{
    foreach($record as $key => $value)
    {
        // simply compare input with current value
        if ($value === $in)
        {
            // add the key to the previously created array
            $recnumber[] = $key;
        }
    }
}

var_dump($recnumber);

This outputs :

array(4) {
[0]=>
string(13) "record_id_003"
[1]=>
string(13) "record_id_006"
[2]=>
string(13) "record_id_008"
[3]=>
string(13) "record_id_011"
}