Title: [Plugin: Relevanssi] is PHP4 supported?
Last modified: August 19, 2016

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# [Plugin: Relevanssi] is PHP4 supported?

 *  [iMiKE](https://wordpress.org/support/users/imike/)
 * (@imike)
 * [16 years, 7 months ago](https://wordpress.org/support/topic/plugin-relevanssi-is-php4-supported/)
 * Hello! After hitting “Save and create index” I have got blank screen.
 * In error.log of my site I have found:
 *     ```
       PHP Fatal error:  Call to undefined function:  mb_internal_encoding() in /wp-content/plugins/relevanssi/relevanssi.php on line 1203, referer: /wp-admin/options-general.php?page=relevanssi/relevanssi.php
       ```
   
 * So, will PHP4 be supported?

Viewing 3 replies - 1 through 3 (of 3 total)

 *  [Mikko Saari](https://wordpress.org/support/users/msaari/)
 * (@msaari)
 * [16 years, 7 months ago](https://wordpress.org/support/topic/plugin-relevanssi-is-php4-supported/#post-1257795)
 * The mb_internal_encoding() function is included in PHP from 4.0.6. The multi-
   byte support module, however, is not necessarily automatically on, so check that.
 * It would be possible to create a version without the multi-byte support and that
   would be well enough for most English-language users, but since I use Relevanssi
   in Finnish, which does need the multi-byte support…
 *  Thread Starter [iMiKE](https://wordpress.org/support/users/imike/)
 * (@imike)
 * [16 years, 7 months ago](https://wordpress.org/support/topic/plugin-relevanssi-is-php4-supported/#post-1257853)
 * As I understand you – I must consult with my hosting provider for such a case?
 *  [Mikko Saari](https://wordpress.org/support/users/msaari/)
 * (@msaari)
 * [16 years, 7 months ago](https://wordpress.org/support/topic/plugin-relevanssi-is-php4-supported/#post-1257886)
 * Yes, ask them to add the support for multi-byte string functions.

Viewing 3 replies - 1 through 3 (of 3 total)

The topic ‘[Plugin: Relevanssi] is PHP4 supported?’ is closed to new replies.

 * 3 replies
 * 2 participants
 * Last reply from: [Mikko Saari](https://wordpress.org/support/users/msaari/)
 * Last activity: [16 years, 7 months ago](https://wordpress.org/support/topic/plugin-relevanssi-is-php4-supported/#post-1257886)
 * Status: not resolved

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