What potential issues can arise when using ctype_digit to validate user input in PHP?

One potential issue when using `ctype_digit` to validate user input in PHP is that it only checks if the string contains digits, which means it will return true for numeric strings, but not for actual integers. To solve this, you can combine `ctype_digit` with `is_numeric` to ensure that the input is a valid integer. 

$user_input = "12345";

if (ctype_digit($user_input) && is_numeric($user_input)) {
    // Input is a valid integer
    echo "Input is a valid integer.";
} else {
    // Input is not a valid integer
    echo "Input is not a valid integer.";
}

Keywords

ctype_digit user input validation PHP potential issues

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