如何从PHP中的数组中选择等于某个特定值的键？

Question

for example if i have the following array:

$numbers=array(
"A"=>$value1,
"B"=>$value2,
"C"=>$value3,
"D"=>$value4,
"E"=>$value5,
"F"=>$value6,
"G"=>$value7,
);

and if some of the value variables are equal to 0 and the rest are equal to 1, how can I select the keys which values are equal, for example to 0?

Answer 1

$result = [];

foreach($numbers as $id => $number) {

     if($number ==0)
         $result[$id] = $number;

}