Verifying Integer-Only Arrays with PHP
One way to check if an array exclusively contains integers is through manual iteration and the is_int() function. However, a more efficient approach utilizes native PHP functionality:
Using array_filter()
array_filter() maintains elements of an array that meet a specified condition. Applying it with is_int() as the predicate directly yields a filtered array:
<code class="php">$only_integers = array_filter($only_integers, 'is_int'); // true $letters_and_numbers = array_filter($letters_and_numbers, 'is_int'); // false</code>
Employing Reusable Helper Functions
This approach can be augmented with reusable helper functions:
<code class="php">/**
* Verify all elements of an array satisfy a given predicate.
*
* @param array $elems Array to evaluate
* @param callable $predicate Predicate to apply
* @return bool TRUE if all elements pass, FALSE otherwise
*/
function all($elems, $predicate) {
foreach ($elems as $elem) {
if (!call_user_func($predicate, $elem)) {
return false;
}
}
return true;
}
/**
* Verify any element of an array satisfies a given predicate.
*
* @param array $elems Array to evaluate
* @param callable $predicate Predicate to apply
* @return bool TRUE if any element passes, FALSE otherwise
*/
function any($elems, $predicate) {
foreach ($elems as $elem) {
if (call_user_func($predicate, $elem)) {
return true;
}
}
return false;
}</code>
By employing these helper functions, the original code can be simplified:
<code class="php">$has_only_ints = all($only_integers, 'is_int'); // true $has_only_ints = all($letters_and_numbers, 'is_int'); // false</code>
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