如何在数组键中搜索子字符串？

Question

I have an array like below

$array =array(
 "123,456,789"=> "1,1,1",
 "333"=>"1",
 "777"=>"1"
)

Now if I am searching 456 then need to return me array key(123,456,789) and its value (1,1,1)

I also tried like below to make it working but i didn't get success.I need like if i am searching with any value of array key like (123 or 456 or 789) then need to provide me same result. I know that i can achieve this using foreach loop but i don't want to create foreach loop for this so suggest me if any other solution exists.

$matching_key = preg_grep("/\b456\b/", $array);

Sorry but I am not much good in regular expression.

Ideas? Any suggestions?

Answer 1

preg_grep function works on array's values , not keys as it is what you need.

You could get keys in first place.

<?php

$array =array(
   "123,456,789"=> "1,1,1",
   "333"=>"1",
   "777"=>"1"
);

$keys = array_keys($array);
$matching_key = preg_grep("/\b456\b/", $keys);

var_dump($matching_key);
//returns "123,456,789"

https://3v4l.org/SndkV

Anyway I need to say that you probably should change your data structure. This looks like a bad design.

Answer 2

Here is a try

$array =array(
   "123,456,789"=> "1,1,1",
   "333"=>"1",
   "777"=>"1"
);

$search = '456';
$result = [];

foreach($array as $key=>$value){

  if (strpos($key, $search) !== false) {
    array_push($result, $value);
  }

}

Print_r($result);

$search is a dynamic Variable which you want to search, i used str_pos() , to find if the string is there in that key.