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Added function Arr::extract_existing() #369

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Added function Arr::extract_existing() #369

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26 changes: 25 additions & 1 deletion classes/Kohana/Arr.php
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Original file line number Diff line number Diff line change
Expand Up @@ -303,7 +303,31 @@ public static function extract($array, array $paths, $default = NULL)

return $found;
}


/**
* Retrieves multiple keys from an array only if they exist.
*
* // Get the values "a", "b" from $arr = array('a' => 'foo', 'b' => 'bar', c => 'car')
* $result = Arr::extract_existing($arr, array('a', 'b'));
* returns array('array('a' => 'foo', 'b' => 'bar')
*
* @param array array to filter keys from
* @param array list of key names to search for
* @return array
*/
public static function extract_existing($array, array $keys)
{
$found = array();
foreach ($keys as $key)
{
if(isset($array[$key]))
{
$found[$key] = $array[$key];
}
}
return $found;
}

/**
* Retrieves muliple single-key values from a list of arrays.
*
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