Comment valider efficacement les tableaux PHP pour le contenu entier ?

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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