How can one ensure that special characters like ö, ü, ä are correctly displayed when retrieved from an Oracle DB in PHP?

Special characters like ö, ü, ä may not be displayed correctly when retrieved from an Oracle DB in PHP due to character encoding issues. To ensure these characters are correctly displayed, you can set the character encoding of the connection to UTF-8 and use htmlentities() or htmlspecialchars() functions to encode the special characters before displaying them. 

// Establish a connection to the Oracle DB with UTF-8 character encoding
$conn = oci_connect('username', 'password', 'dbname', 'UTF8');

// Retrieve data from the Oracle DB
$query = oci_parse($conn, "SELECT column_name FROM table_name");
oci_execute($query);

// Fetch and display data with special characters encoded
while ($row = oci_fetch_array($query, OCI_ASSOC+OCI_RETURN_NULLS)) {
    echo htmlentities($row['column_name'], ENT_QUOTES, 'UTF-8');
}

Keywords

PHP Oracle DB character encoding utf8_encode special characters

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