How can you validate integer values in a PHP form?

To validate integer values in a PHP form, you can use the `filter_var()` function with the `FILTER_VALIDATE_INT` filter. This function will check if the input is a valid integer. You can also use additional checks like `is_numeric()` to ensure the input is a number. If the input is not a valid integer, you can display an error message to the user. 

// Validate integer input from a form field
$input = $_POST['integer_input'];

if (filter_var($input, FILTER_VALIDATE_INT) === false) {
    echo "Please enter a valid integer.";
} else {
    // Input is a valid integer
    // Process the input further
}

Keywords

PHP form validation integer values filter_var FILTER_VALIDATE_INT

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