PHP 在 array_filter 中只返回 0

Question

I am trying to only return when the value in the array is only 0 . Because array_filter automatically filter 0 , null , empty etc I need to use custom callback.

But get every return that is not null , empty

the array is

[
    (int) 0 => '0',
    (int) 1 => '-100',
    (int) 2 => '100'
]

function countBETrades($arr) {
    $arrBE = array_filter($arr, function($v){
        return $v !== false && !is_null($v) && ($v != '' || $v == '0');
    });
    
    return count($arrBE);
}

Answer 1

if you want only the number 0 to be counted, then you only need to check for it (using the triple = in order to force PHP to check the type, so null === 0 is false):

function countBETrades($arr) {
    $arrBE = array_filter($arr, function($v){
        return $v === 0 || $v === '0';
    });
    
    return count($arrBE);
}