A non-UTF8 char has to trigger an alert during the import

[lamasfoker]

A non-UTF8 char on a field has to trigger an alert during the import and stop it for the current product otherwise, the import itself should remove this char and complete the data transmission to Sylius.

[fabianaromagnoli]

Sometimes also control characters can be cut and pasted into Akeneo text fields, such as the DLE character. Those characters are not visible because they are not printable, but they cause issues if they are used in XML files: XML does not support control characters, even if the field is enclosed in CDATA. To be exact, in XML 1.1 you can use some control characters, using NCR notation, but they are useless characters, so that we just need to remove them from texts.

Control characters can be removed with a simple regexp:

preg_replace('/[[:cntrl:]]/', '', $text)