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Solving Drupal 6 Multibyte String Problem in PHP

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If an existing Drupal 6 site encounters the Unicode library error "Multibyte string input conversion in PHP is active and must be disabled" after upgrading PHP, then the following steps may help resolve the issue.

==========

1. In the Drupal folder, open the file that handles the Drupal settings.

sites/default/settings.php

2. Scroll to the bottom of the file and add the lines marked "After PHP upgrade" as follows.

// BEGIN CODE
// ...

ini_set('mbstring.http_input', 'pass'); //After PHP upgrade
ini_set('mbstring.http_output', 'pass'); //After PHP upgrade

// END CODE

3. Save the file and reload the page.

==========

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