如何使用PHP查明字符串中是否存在子字符串？

I know many questions already asked about this problem, but I was not able to find the right answer for my specific problem.

I have a search string - "1|1"

I have a array containing following values - "a" => "1|1", "b" => "2|1,1|1", "c" => "3|2,2|1"

All I want to do is just to find if the search string existed in the array, it should return the array key. If more than one array item has the search string, it should return all of them.

In this example, I am expecting to get both "a" and "b", but when I use strpos(), it only gives me "a".

How can I solve this problem?

Edit**

This is my code

function array_search_i($str, $array)
{
    $returnArray = array();
    foreach ($array as $key => $value) {
        if (strpos($str, $value) !== false) {
            array_push($returnArray, $key);
        }
    }
    return $returnArray;
}

Watch out for the !== operator. We have to check for the type as well..

$searchArray = array('2|2','1|1,3|3','1|1');
$search = '1|1';
foreach ($searchArray as $k=> $value) {
    if (strpos($value,$search) !== false) {
        $keysWithMatches[] = $k;
    }
}

print_r($keysWithMatches);

$keys = array();
foreach($a as $k=>$v){
    if(strpos($v,'1|1') !== false) $keys[] = $k;
}

strpos will only "Find position of first occurrence of a string ".

Look at array_keys. I think this will be closer to what you want. Alternatively, if it's not able to do "partial matching" which is what you probably need, you may have to use array_map or array_filter.

Simply use preg_grep.

print_r(preg_grep("/1\|1/", $array));

The simplest way I can think of is using the PHP native function array_key().

Here is how it works:

$array = array("a" => "1|1", "b" => "2|1,1|1", "c" => "3|2,2|1");

$result = array_keys($array,'1|1');

print_r($result);
// 'a' => '1|1'

UPDATE:

print_r($array[$result[0]]); // Makes more sense.
                             // '1|1'

Here you go:

<?php
    $array = Array("a" => "1|1", "b" => "2|1,1|1","c" => "3|1,2|1","d" => Array("a1" => "1|1"));
    array_walk($array,"find");

    function find($value, $key) {
        if (!is_array($value)) {
            if (preg_match("/\b1\|1\b/i",$value)) {
            echo $key .'<br />';
            }
        }
        else {
            array_walk($value,"find");
        }
    }
?>

By this example you will get:

a
b
a1

array_filter() is what you need. Try the following code.

$array = array("a"=>array("1|1"), "b"=>array("2|1","1|1"), "c"=>array("1|2"));
var_dump(array_keys(array_filter($array, function ($elem) { return in_array('1|1', $elem); } )));

OUTPUT

array(2) {
  [0]=>
  string(1) "a"
  [1]=>
  string(1) "b"
}

You can use array_keys with search_value parameter to search for all values in an array.

This example will get keys of all matching exact values:

<?php
$searchArray = array('2|2','1|1','1|1');
$search = '1|1';
print_r(array_keys($searchArray, $search));
?>

(OR)

This example will get the key of all the partial-values

<?php
foreach($array as $key => $val) {
   if(strpos($val,'green') !== false) {
      $resKeys[] = $key;
   }
}

print_r($resKeys);
?>