How can PHP developers ensure proper encoding and decoding of special characters like umlauts and quotation marks when handling user input in forms or text fields?

PHP developers can ensure proper encoding and decoding of special characters like umlauts and quotation marks by using the htmlentities() function to encode user input before storing it in a database or displaying it on a webpage. When retrieving user input, developers can use the htmlspecialchars_decode() function to decode the encoded characters back to their original form. 

// Encoding user input before storing it
$encoded_input = htmlentities($_POST['user_input'], ENT_QUOTES);

// Decoding user input when retrieving it
$decoded_input = htmlspecialchars_decode($encoded_input, ENT_QUOTES);

Keywords

PHP encoding decoding special characters user input forms.

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