What is the purpose of using mb_convert_encoding in the PHP code provided in the forum thread?

The issue in the forum thread is related to encoding errors when handling strings in PHP. The mb_convert_encoding function is used to convert strings from one encoding to another, which can help resolve issues with character encoding mismatches. By using mb_convert_encoding, the PHP code can ensure that the strings are in the correct encoding format, preventing errors and displaying the content correctly.

// Original code with encoding issue
$original_string = "São Paulo";
$encoded_string = utf8_encode($original_string);
echo $encoded_string; // Output: São Paulo

// Using mb_convert_encoding to fix encoding issue
$original_string = "São Paulo";
$encoded_string = mb_convert_encoding($original_string, 'UTF-8', 'ISO-8859-1');
echo $encoded_string; // Output: São Paulo