explode() and maximum function nesting level

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I can found in logs errors like:, Maximum function nesting level of '100' reached, aborting!

The line is:

$keys = explode('.', $keys);

Any idea?

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If you are using xdebug, increase the value of xdebug.max_nesting_level in your php.ini

http://xdebug.org/docs/all_settings#max_nesting_level