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<?php var_dump( preg_split( '//u', "A\xf4\x90\x80\x80B" ) );
Output for 7.3.12 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
bool(false)
Output for 4.4.9, 5.2.5 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33
array(1) { [0]=> string(6) "A�B" }
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.4
array(5) { [0]=> string(0) "" [1]=> string(1) "A" [2]=> string(4) "�" [3]=> string(1) "B" [4]=> string(0) "" }
Output for 4.3.5 - 4.3.11, 4.4.0 - 4.4.8
array(3) { [0]=> string(0) "" [1]=> string(1) "A" [2]=> string(5) "�B" }
Output for 4.3.0 - 4.3.4
array(8) { [0]=> string(0) "" [1]=> string(1) "A" [2]=> string(1) "�" [3]=> string(1) "�" [4]=> string(1) "�" [5]=> string(1) "�" [6]=> string(1) "B" [7]=> string(0) "" }

preferences:
202.98 ms | 401 KiB | 356 Q