PHP Manual: Checks if all array elements satisfy a callback function

Description

bool array_all(array $array, callable $callback)

array_all returns true, if the given callback returns true for all elements. Otherwise the function returns false.

Parameters

array

The array that should be searched.

callback

The callback function to call to check each element, which must be

bool callback(mixed $value, mixed $key)

If this function returns false, false is returned from array_all and the callback will not be called for further elements.

Return Values

The function returns true, if callback returns true for all elements. Otherwise the function returns false.

Examples

Example #1 array_all example

<?php
$array = [
    'a' => 'dog',
    'b' => 'cat',
    'c' => 'cow',
    'd' => 'duck',
    'e' => 'goose',
    'f' => 'elephant'
];

// Check, if all animal names are shorter than 12 letters.
var_dump(array_all($array, function (string $value) {
    return strlen($value) < 12;
}));

// Check, if all animal names are longer than 5 letters.
var_dump(array_all($array, function (string $value) {
    return strlen($value) > 5;
}));

// Check, if all array keys are strings.
var_dump(array_all($array, function (string $value, $key) {
   return is_string($key);
}));
?>

The above example will output:

bool(true)
bool(false)
bool(true)

array_all

Description

Parameters

Return Values

Examples

See Also