Check if object contains an property matching a string

Question

stdClass Object ( [id] => 11 [type] => 5 [color_a] => 57 [color_b] => 3 [date] => 2 )

How to check if the object has attributes that CONTAIN the string "color" ?

I tried with array_diff_key and array_filter but i cannot use ARRAY_FILTER_USE_KEY because it runs on PHP 5.4.

No loops if possible :)

possible duplication: http://stackoverflow.com/questions/2471120/php-function-array-key-exists-and-regular-expressions — YyYo, Apr 01 '15 at 17:39

score 2 · Accepted Answer · answered Apr 01 '15 at 17:18

This should work for you:

(Here I just cast the object to an array and search with preg_grep() in the array_keys(). Then I simply flip the array back with array_flip())

$result = array_flip(preg_grep("/\bcolor/", array_keys((array)$o)));
print_r($result);

output:

Array ( [color_a] => 2 [color_b] => 3 )

And if you just want to use it to check for TRUE or FALSE like with in_array() you don't need to flip it back and you can simply use it like this:

if(preg_grep("/\bcolor/", array_keys((array)$o)))
    echo "match";

score 0 · Answer 2 · edited Feb 25 '21 at 02:54

0

function isKeyExists($key,$array){
    $arr = preg_grep('/.*'.$key.'.*/',array_keys($array));
    if(count($arr)){
        return true;
    }  
    return false;
}
$arr = Array('id'=>'11','type'=>5,'color_a'=>57,'color_b'=>3,'date'=>2);
isKeyExists('color_',$arr); // return boolean if exists or not

edited Feb 25 '21 at 02:54

mickmackusa

43,625
12
83
136

answered Apr 01 '15 at 17:33

YyYo

651
5
13

score 0 · Answer 3 · answered Apr 01 '15 at 17:53

No regex solution:

    $std          = new StdClass();
    $std->id      = 11;
    $std->type    = 5;
    $std->color_a = 57;
    $std->color_b = 3;
    $std->date    = 2;

    $result    = array();
    $searchFor = 'color';

    array_map(function($value) use(&$result, $searchFor){

        if(strpos($value, $searchFor) !== false){
            $result[] = $value;
        }

    }, array_keys((array)$std));

    var_dump(count($result));

Check if object contains an property matching a string

3 Answers3