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.
Table of Content
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 ā input array you want to check.
- callback ā function that tests each value.
- return ā 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:
$result = array_all(
["[email protected]", "[email protected]"],
fn($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
What is PHP array_all and how does it work?
Here is how to build the helper function for PHP versions earlier than 8.4:
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";
How to use PHP array_all with associative arrays?
$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";
What is the difference between PHP array_all and array_filter?
true
if all elements match.
array_filter returns filtered elements that match.
$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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