PHP: Using in_array with __set method

Question

I am unable to match a key in an array using in_array, contrary to what I expect.

The array I am attempting to match is part of the _props array, created using the magic method __set().

The following code returns the response Incorrect result. Here is the code, I hope that it's fairly self-explanatory.

class foo{

    private $_props;

    public function __set($name, $val){
            $this->_props[$name] = $val;
    }

    public function test(){

            $md_array = array(
                    1 => array(0 => '0', 1 => '1'),
                    2 => array(0 => '0', 1 => '1'),
                    3 => array(0 => '0', 1 => '1')
            );

            $this->__set('test', $md_array);

            if(in_array(1, $this->_props['test'])){
                    echo "Correct result";
            }else{
                    echo "Incorrect result";
            }
   }
}
$a = new foo();
$a->test();

Can anyone explain this behaviour for me and offer an alternative?

if I var_dump $this->_props I get the following response:

array
  'test' => 
    array
      1 => 
        array
          0 => string '0' (length=1)
          1 => string '1' (length=1)
      2 => 
        array
          0 => string '0' (length=1)
          1 => string '1' (length=1)
      3 => 
        array
          0 => string '0' (length=1)
          1 => string '1' (length=1)

Thanks in advance.

you are testing the value this->_props['test'] which is whatevery you assined to foo->test but it is NOT an array at the first place — Fuzzyma
– Fuzzyma, Commented Jan 15, 2015 at 12:18
Thanks, but this works var_dump($this->_props['test'][1]);. It gets the correct key and val?? — user783322
– user783322, Commented Jan 15, 2015 at 12:21
Well - the array $this->_props is dynamical. We dont know what is in there. Can you pls add which $value is added under the $key test? — Fuzzyma
– Fuzzyma, Commented Jan 15, 2015 at 12:22
btw why you are using magic function to set some array values ? — Kuldeep Dangi
– Kuldeep Dangi, Commented Jan 15, 2015 at 12:29

rdiz · Accepted Answer · 2015-01-15 12:26:00Z

1

in_array() looks in the values of the array. As I understand it, you want to search the keys, you wanna use array_key_exists():

        if(array_key_exists(1,$this->_props['test'])){
                echo "Correct result";
        }else{
                echo "Incorrect result";
        }

you should get the right result. If you're meaning to look for the values recursively, consider using array_find()

edited Jan 15, 2015 at 12:26

answered Jan 15, 2015 at 12:18

rdiz

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2 Comments

Fuzzyma Over a year ago

hes searching in this->_props and not in md_array. Your answer would be right, if it would be the md_array

rdiz Over a year ago

$this->_props = ['test'=>$md_array] so basically he is, just a level above.

Community · Accepted Answer · 2017-05-23 10:33:19Z

0

you have a multidim array, and so in_array will not work for you. you need an own function:

function in_array_r($needle, $haystack, $strict = false) {
    foreach ($haystack as $item) {
        if (($strict ? $item === $needle : $item == $needle) || (is_array($item) && in_array_r($needle, $item, $strict))) {
            return true;
        }
    }

    return false;
}

and in your code:

if(in_array_r(1, $this->_props['test'])){
                    echo "Correct result";
            }else{
                    echo "Incorrect result";
            }

look here: in_array() and multidimensional array

edited May 23, 2017 at 10:33

CommunityBot

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answered Jan 15, 2015 at 12:18

goldlife

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2 Comments

Fuzzyma Over a year ago

$this->props is NO multidimensional array

goldlife Over a year ago

in my test it is: print_r($this->_props['test']) is : Array ( [1] => Array ( [0] => 0 [1] => 1 ) [2] => Array ( [0] => 0 [1] => 1 ) [3] => Array ( [0] => 0 [1] => 1 ) )

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