PHP find array key in two dimension array

Question

<?php
$x = array(
       "C_Card_ID" => array(
                              "dbName"=>"CardID",
                              "type"=>"disabled",
                              "key"=>"primary"
                          ),
       "C_Payroll_ID" => array(
                              "dbName"=> "PayrollID",
                              "key"=>"unique"
                          ),
       "C_First_Name" => array("dbName"=>"FirstName")
?>

I want keys of $x which has "key" index in its second array. In simple words, i need C_Card_ID and C_Payroll_ID as an output in array, so later i will implode them.

Required output Sample : Array("C_Card_ID","C_Payroll_ID")

Please don't use Loop algo. I need to use some build-in function.

score 2 · Accepted Answer · 2013-06-28 07:58:49Z

2

You can use array_filter:

syntax is:

$filtered_array = array_keys(array_filter($x, function($a){ return isset($a['key']); }));

edited Jun 28, 2013 at 7:58

answered Jun 28, 2013 at 7:52

user409460

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Comments

elclanrs · Accepted Answer · 2013-06-28 07:50:07Z

2

This should do:

$result = array_keys(array_filter($x, function($arr){
  return array_key_exists('key', $arr);
}));

answered Jun 28, 2013 at 7:50

elclanrs

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2 Comments

Wasim A. Over a year ago

Warning: array_key_exists() expects parameter 2 to be array, string given in xx.php on line xx

Wasim A. Over a year ago

instead of array_key_exists('key', $arr); .... isset($arr['key']) work fine for all string and array. nice answer, thanks

Rohan Kumar · Accepted Answer · 2013-06-28 07:52:26Z

2

Try to use array_slice() like,

<?php
    $x = array(
           "C_Card_ID" => array(
                                  "dbName"=>"CardID",
                                  "type"=>"disabled","key"=>"primary"
                              ),
           "C_Payroll_ID" => array(
                                  "dbName"=> "PayrollID",
                                  "key"=>"unique"
                              ),
           "C_First_Name" => array("dbName"=>"FirstName"));
    print_r(array_slice(array_keys($x),0,2));
    //Outputs
    //Array ( [0] => C_Card_ID [1] => C_Payroll_ID ) 
?>

Tested on http://writecodeonline.com/php/

answered Jun 28, 2013 at 7:52

Rohan Kumar

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1 Comment

Wasim A. Over a year ago

correct but i am using associative array and my indexing is not fixed at 0,1 or 2 etc. however helpful

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