Checks if all array elements satisfy a callback function

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- PHP Manual
- Array Functions
- Checks if all array elements satisfy a callback function

# array_all

(PHP 8 >= 8.4.0)

array_all — Checks if all array elements satisfy a callback function

### Description

array_all(array `$array`, callable `$callback`): bool

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

  callback(mixed `$value`, mixed `$key`): bool
  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)

### See Also

- array_any() - Checks if at least one array element satisfies a callback function
- array_filter() - Filters elements of an array using a callback function
- array_find() - Returns the first element satisfying a callback function
- array_find_key() - Returns the key of the first element satisfying a callback function