PHP remove specific item from array [duplicate]

Question

I have an array like : [312, 401, 1599, 3]

With array_diff( [312, 401, 1599, 3], [401] ) I can remove a value, in my example I removed the value 401.

But if I have this : [312, 401, 401, 401, 1599, 3], how can remove just one time the value 401 ?

It is not important if I remove the first or last value, I just need to remove ONE 401 value, and if I want to remove all 401 values, I have to remove three times.

Thanks !

Answer 1

With array_search you can get the first matching key of the given value, then you can delete it with unset.

if (false !== $key = array_search(401, $array)) {
  unset($array[$key]);
}

Answer 2

Search specific key and remove it:

if (($key = array_search(401, $array)) !== false) {
   unset($array[$key]); 
}

Man PHP:

array_search

unset

Answer 3

With array_intersect you can retrieve all matching keys at once, which allows you to decide which specific one of them to remove with unset.