How can you check if an input in an HTML text field corresponds to a number in PHP?

To check if an input in an HTML text field corresponds to a number in PHP, you can use the `is_numeric()` function. This function will return true if the input is a number, and false if it is not. You can use this function to validate user input and ensure that only numbers are accepted. 

$input = $_POST['number_input']; // Assuming the input is submitted via POST
if (is_numeric($input)) {
    echo "Input is a number.";
} else {
    echo "Input is not a number.";
}

Keywords

PHP HTML text field input validation is_numeric

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