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"json-encode  Invalid UTF-8 sequence in argument in " error after 7.5 migration

Question asked by frinaldi on Apr 10, 2015
Latest reply on Jul 9, 2015 by Ernesto Padron

we migrated our 6.x instance to 7.5.x version (PRO) and now we expected encoding issues :

PHP Warning:  json_encode() [<a href='function.json-encode'>function.json-encode</a>]: Invalid UTF-8 sequence in argument in /var/www/html/migration/include/api/RestResponse.php on line 164, referer:

I supposed that somes files and/or mysql data are wrongly encoded but I don't know how to fix it ? Change all files encoding ? extend the json_encode ?

Any idea (even more solution :-) is welcome.