What steps can PHP developers take to diagnose and troubleshoot common issues with character encoding, such as displaying incorrect characters like "ä ö ü" instead of umlauts?

Character encoding issues like displaying incorrect characters such as "ä ö ü" instead of umlauts can be caused by mismatched character encoding settings between the PHP script and the database or web page. To troubleshoot this issue, PHP developers can ensure that all components are using the same character encoding (e.g., UTF-8), set the correct headers in the PHP script to specify the character encoding, and use PHP functions like utf8_encode() or utf8_decode() to convert strings to the correct encoding. 

// Set the character encoding to UTF-8
header('Content-Type: text/html; charset=utf-8');

// Convert the string to UTF-8 encoding
$correct_string = utf8_encode($incorrect_string);

// Display the correct string with umlauts
echo $correct_string;

Keywords

Character encoding PHP UTF-8 mb_detect_encoding iconv

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