John Davidson

Message:

I have an array of non-empty arrays which contain non-negative integers and I need to remove all rows/subarrays which contain at least one zero.

I know I can use a foreach() or array_filter() to make iterated calls of in_array(), but is there a more elegant/concise approach -- perhaps a functional approach without an anonymous callback?

foreach ($array as $k => $row) {

    if (in_array(0, $row)) {

        unset($array[$k]);

    }

}

Or

array_filter(

    $array,

    function($row) {

        return !in_array(0, $row);

    }

)

Sample array:

$array = [

    'one' => [20,0,40,0,60],

    'two' => [50],

    'three' => [0, 0, 0, 0],

    'four' => [10, 5],

    'five' => [0],

];

Desired output:

['two' => [50], 'four' => [10, 5]]

---

My Answer:
> You can use the `array_filter()` function with a custom callback function to achieve this in a more concise way without using an anonymous callback. Here's an example:

php
$array = [
[1, 2, 3],
[4, 5, 6],
[7, 8, 9],
[0, 1, 2],
[3, 0, 4]
];

function hasZero($subarray) {
return !in_array(0, $subarray);
}

$result = array_filter($array, 'hasZero');

print_r($result);


This will output:


Array
(
[0] => Array
(
[0] => 1
[1] => 2
[2] => 3
)

[1] => Array
(
[0] => 4
[1] => 5
[2] => 6
)

[2] => Array
(
[0] => 7
[1] => 8
[2] => 9
)

)


This code defines a custom function `hasZero()` that checks if a subarray contains a zero. The `array_filter()` function then filters out the subarrays that return `false` from the `hasZero()` function.