array_search不适用于嵌套数组

Question

$needle = 'foo'; 

$haystack = [ 
    'bar' => [ 'foo' ], 
    'baz' => [ 'qux' ] 
]; 

// if 'foo' in of the arrays of $haystack, return its key 
// in this case its 'bar' 

array_search似乎在简单数组上工作。我的情况需要什么？

Answer 1

希望这简单的一个将有助于

Try this code snippet here

foreach($haystack as $key => $array) 
{ 
    if(in_array($needle, $array)) 
    { 
     break; 
    } 
} 
echo $key;