How to use PHP in_array with associative array?

Question

Is there any php function such as in_array for associative arrays you get by the mysql function "mysql_fetch assoc" ?

For example, if I have an $array that looks like this:

array(0=>(array(ID=>1, name=>"Smith"), 1=>(array(ID=>2, name=>"John"))

Can I do something like in_array(key,value,array)?

Or in my case, if I am looking for the ID value of "1", in_array("ID",1,$array).

This is my solution, comment on it if you think it's the right way:

function in_assoc_array($key,$value,$array)
{
    if (empty($array))
        return false;
    else
    {
        foreach($array as $a)
        {
            if ($a[$key] == $value)
                return true;
        }
        return false;
    }
}

I think you want to compare the key/value pair with your given value. right? — Rahil Wazir
– Rahil Wazir, Commented Feb 16, 2014 at 8:53

Phil LaNasa · Accepted Answer · 2015-12-22 20:00:38Z

50

In your case, I wonder if simply using isset() makes more sense, i.e.

isset($a[$key])

answered Dec 22, 2015 at 20:00

Phil LaNasa

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2 Comments

rajangupta Over a year ago

isset we use when we know the key and array is designed in that way. sometimes we have to in_array for searching

Samuel Ramzan Over a year ago

Your light, simple and elegant solution works and that is how it should be. Thank You @Phil LaNAsa

Clinton Dobbs · Accepted Answer · 2021-11-12 07:40:17Z

22

Here is a one liner you can use.

$isInArray = in_array(1, array_column($names, 'ID'));

$isInArray = a Boolean (true or false) defining whether the value given was found within the column requested of the array in question.

1 = The value that is being searched for within the array.

$names = The array in question.

'ID' = The column within the array where we are searching for the value of 1.

edited Nov 12, 2021 at 7:40

answered Apr 10, 2020 at 16:31

Clinton Dobbs

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1 Comment

Imran_Developer Over a year ago

that's perfectly works, saved my day, this is also perfect for 2 foreach loops and checkboxes populated using laravel projects

user3270303 · Accepted Answer · 2014-02-16 09:29:38Z

17

Try this..... You can use this function for any depth of the associated array. Just contraint to this function is that the key value would not be repeat any where in array.

<?php 
function is_in_array($array, $key, $key_value){
      $within_array = 'no';
      foreach( $array as $k=>$v ){
        if( is_array($v) ){
            $within_array = is_in_array($v, $key, $key_value);
            if( $within_array == 'yes' ){
                break;
            }
        } else {
                if( $v == $key_value && $k == $key ){
                        $within_array = 'yes';
                        break;
                }
        }
      }
      return $within_array;
}
$test = array(
                0=> array('ID'=>1, 'name'=>"Smith"), 
                1=> array('ID'=>2, 'name'=>"John")
        );
print_r(is_in_array($test, 'name', 'Smith'));
?>

answered Feb 16, 2014 at 9:29

user3270303

4 Comments

PumpkinSeed Over a year ago

I don't udnerstand why you wrote a new code, when there is a built-in function for that. You can see it below. On an other point the $k variable is waste of memory space, because it should check the value only.

Jacob Cohen Over a year ago

@AndrewJarvis although it has been a while, why do you say that?

Jarvl Over a year ago

@JacobCohen A foreach loop on the top-level array and a simple if (isset($array["ID"]) && $array["ID"] === 1) {} will do the trick with much less code.

deemi-D-nadeem Over a year ago

Nice answer ... works for me

Shankar Narayana Damodaran · Accepted Answer · 2014-02-16 09:08:50Z

10

You can't do it directly on nested arrays.. You need to nest it down a bit and then do it.

<?php
$arr=array(0=>array('ID'=>1, 'name'=>"Smith"), 1=>array('ID'=>2, 'name'=>"John"));

foreach($arr as $arr1)
{
    if(in_array(1,$arr1))
    {
       echo "Yes found.. and the correspoding key is ".key($arr1)." and the employee is ".$arr1['name'];
    }
}

OUTPUT :

Yes found.. and the correspoding key is ID and the employee is Smith

edited Feb 16, 2014 at 9:08

answered Feb 16, 2014 at 8:52

Shankar Narayana Damodaran

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5 Comments

Jacob Cohen Over a year ago

Guess I'ma just have to write my own function for it then huh?

Shankar Narayana Damodaran Over a year ago

Nope just do a foreach and you can do it inside of that.

Jacob Cohen Over a year ago

I edited my post, look at the code and tell me if you think its right, or if there's a way to make it better.

Shankar Narayana Damodaran Over a year ago

@JacobCohen, See the edited answer are you looking something similar like this ?

Jacob Cohen Over a year ago

Almost! I wanted to do it for a specific key I pick. I managed to write it on my own though, thanks for the muse.

arghtype · Accepted Answer · 2015-08-28 15:24:35Z

8

First you must know which part of the associative array you're going to use as haystack in in_array function. Then you can use in_array without additional code.

Example with values :

<?php
$assoc = array(1 => "apple", 2 => "banana", 3 => "lemon", 4 => "pear");
$haystack = array_values($assoc);
echo "<p>" . print_r($assoc, true) . "</p>";

$needle = 'banana';
$find = (in_array($needle, $haystack)) ? 'TRUE' : 'FALSE';
echo "<p>$needle : $find</p>";

$needle = 'cherry';
$find = (in_array($needle, $haystack)) ? 'TRUE' : 'FALSE';
echo "<p>$needle : $find</p>";
?>

Results in :

Array ( [1] => apple [2] => banana [3] => lemon [4] => pear )

banana : TRUE

cherry : FALSE

edited Aug 28, 2015 at 15:24

arghtype

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answered Aug 28, 2015 at 14:29

David Blanchard

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Comments

Prafulla Kumar Sahu · Accepted Answer · 2021-07-20 13:47:32Z

4

Syntax

 in_array(mixed $needle, array $haystack, bool $strict = false): bool

Needle can be mixed type, so it can be any type, no issues if it is a numeric or associative array.

in_array('foo',array_unique(array_keys($array)));

edited Jul 20, 2021 at 13:47

Prafulla Kumar Sahu

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answered Jul 20, 2021 at 9:35

dılo sürücü

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Comments

Ivan Ferrer · Accepted Answer · 2017-09-04 21:25:04Z

The sample formule, using class and methods:

class VerifyInArray
{
 public function getMyCollection($field, $collection)
 {
     $list = array();
     if (count($collection)) {
        foreach ($collection as $k => $val) {
            $list[] = $val[$field];
        }
     }
     return $list;
 }

public function inMyArray($collection, $field, $findValue)
{
    if (isset($collection[0])) {
        if (array_key_exists($field, $collection[0]) == false) {
           return 'no'; 
        }
    }

    if (in_array($findValue, $this->getMyCollection($field, $collection))) {
        return 'ok';
    }
    return 'no';
}

public function displayInArray($collection, $attr, $value)
{
   return 'search result: '. $this->inMyArray($collection, $attr, $value);
}

}
$src = new VerifyInArray();

 $collection = array(
         array(
               'ID' => 1, 
               'name' => 'Smith'
         ), 
         array(
               'ID' => 2, 
               'name' => 'John'
         )
    );
echo $src->displayInArray($collection, 'ID', 2). "\n<br>" .
     $src->displayInArray($collection, 'ID', 0);

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