What are some ways to restrict input in a PHP form to only one word?

To restrict input in a PHP form to only one word, you can use regular expressions to validate the input. You can create a regular expression pattern that allows only one word, which means no spaces are allowed. By using the preg_match function in PHP, you can check if the input matches the specified pattern and only allow submission if it does. 

<?php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $input = $_POST["input"];

    // Regular expression pattern to allow only one word
    $pattern = '/^\w+$/';

    if (preg_match($pattern, $input)) {
        // Input is valid, process the form
        echo "Input is valid: " . $input;
    } else {
        // Input is not valid
        echo "Input must be a single word with no spaces.";
    }
}
?>

<form method="post">
    <input type="text" name="input" />
    <input type="submit" value="Submit" />
</form>

Keywords

PHP form validation input restriction regular expressions preg_match

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