CODE EXAMPLE FOR PHP

php check if string is integer

<?php
$strings = array('1820.20', '10002', 'wsl!12');
foreach ($strings as $testcase) {
    if (ctype_digit($testcase)) {
        echo "The string $testcase consists of all digits.
";
    } else {
        echo "The string $testcase does not consist of all digits.
";
    }
}
?>