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<?php var_dump( preg_split('/(?<![^\\\\][\\\\]),/', "asdfdsf\dsfaf") );
Output for 4.4.5 - 4.4.9, 5.2.0 - 7.1.0
array(1) { [0]=> string(13) "asdfdsf\dsfaf" }
Output for 4.3.11 - 4.4.4, 5.0.0 - 5.1.6
Warning: preg_split(): Compilation failed: lookbehind assertion is not fixed length at offset 13 in /in/mTgRo on line 2 bool(false)
Output for 4.3.0 - 4.3.10
Warning: Compilation failed: lookbehind assertion is not fixed length at offset 13 in /in/mTgRo on line 2 bool(false)