PHP array_all Function: How it Works with Examples

PHP 8.4 released a new built-in function, array_all checks to check if all array values meet a condition. It gives a true or false result.

Understand the array_all Function in PHP

The array_all checks all values with one callback function and returns true only if every value passes the rule.

The syntax looks like this:

array_all(array $array, callable $callback)

Here is how it works:

• array → input array you want to check.
• callback → function that tests each value.
• return → true if all values pass. False if one value fails.

The array_all runs the callback on each array value. If one test fails, the function stops and returns false. If all pass, the result is true.

Use array_all to confirm that an array has only valid data. For example, you can test if all numbers are positive or if all strings match a pattern.

Here is a quick example:

$result = array_all([2, 4, 6], fn($n) => $n % 2 === 0);
var_dump($result);

This code checks if all numbers are even and gives true because every number divides by 2.

Examples of the array_all in PHP

Check if All Numbers are Positive:

$result = array_all([1, 3, 5], fn($n) => $n > 0);
var_dump($result);

This code checks if every number is positive. The function runs through the array and returns true since all numbers pass.

Confirm All Values are Strings:

$result = array_all(["a", "b", "c"], fn($v) => is_string($v));
var_dump($result);

This checks if every array value is a string. The callback tests each element and returns true because all are valid strings.

Check Mixed Values for Even Numbers:

$result = array_all([2, 4, 7, 8], fn($n) => $n % 2 === 0);
var_dump($result);

This array has one odd number. The callback fails on 7, so the function returns false.

Confirm Email Format with Regex:

$result = array_all(
  ["a@mail.com", "b@mail.com"],
  fn($v) => filter_var($v, FILTER_VALIDATE_EMAIL) !== false
);
var_dump($result);

The code checks if all values match a valid email format. Since both values pass, the result comes back as true.

Wrapping Up

You learned how array_all checks all values with a rule and how it compares to array_filter.

Here is a quick recap:

• array_all gives true if all values pass one rule.
• array_filter gives a new array with only valid values.
• Use array_all for boolean checks.
• Use array_filter to build a valid array.

FAQs

if( ! function_exists('array_all') ) {
function array_all($array, $callback) {
    foreach ($array as $value) {
        if (!$callback($value)) {
            return false;
        }
    }
    return true;
}
}
$result = array_all([2, 4, 6], function($n) {
    return $n % 2 === 0;
});

echo $result ? "All even" : "Not all even";

$data = ["a" => 5, "b" => 10, "c" => 15];

$result = array_all($data, function($value) {
    return $value > 3;
});

echo $result ? "All greater than 3" : "Some not greater";

$nums = [2, 4, 6, 8];

$all = array_all($nums, function($n) {
    return $n % 2 === 0;
});

$filtered = array_filter($nums, function($n) {
    return $n % 2 === 0;
});

echo $all ? "All passed" : "Some failed";
print_r($filtered);

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