How could the code be optimized to improve performance and readability?

The code can be optimized by using a single loop to iterate through the array and checking if the current element is an integer. This will improve performance by reducing the number of loops needed. Additionally, using more descriptive variable names can improve readability. 

$numbers = [1, 2, 'three', 4, 'five'];
$filteredNumbers = [];

foreach ($numbers as $number) {
    if (is_int($number)) {
        $filteredNumbers[] = $number;
    }
}

print_r($filteredNumbers);

Keywords

code optimization performance improvement readability enhancement PHP functions libraries

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