如何有效驗證 PHP 陣列的整數內容？

Efficient Array Validation for Integer Content

In PHP, verifying whether an array exclusively contains integers can be achieved through various approaches. While manual iteration and conditional checks are a viable option, there exists a more concise solution utilizing native PHP functionality.

Filtering with array_filter

The array_filter function offers a convenient and efficient method for this task. It filters an array based on a provided callback function, returning a new array containing only the elements that satisfy the condition. In our case, we can employ the built-in is_int function as the callback to isolate integer elements:

<code class="php">$only_integers       === array_filter($only_integers,       'is_int'); // true
$letters_and_numbers === array_filter($letters_and_numbers, 'is_int'); // false</code>

Abstraction with Higher-Order Functions

To enhance code readability and reusability, we can define helper functions that generalize our validation process. These functions leverage higher-order functions, which operate on functions as arguments, providing greater flexibility.

<code class="php">// Check if all array elements pass the predicate
function all($elems, $predicate) {
  foreach ($elems as $elem) {
    if (!call_user_func($predicate, $elem)) {
      return false;
    }
  }

  return true;
}

// Check if any array element passes the predicate
function any($elems, $predicate) {
  foreach ($elems as $elem) {
    if (call_user_func($predicate, $elem)) {
      return true;
    }
  }

  return false;
}</code>

With these helpers, our original validation becomes a concise and declarative expression:

<code class="php">all($only_integers,       'is_int'); // true
any($letters_and_numbers, 'is_int'); // false</code>

Simplified Invocation

To further simplify the validation process, we can encapsulate the helpers within a custom function that accepts an array and returns a boolean flag:

<code class="php">function array_has_only_ints($array) {
  return all($array, 'is_int');
}</code>

This function provides a con

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