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<?php var_dump(basename(null)); var_dump(basename('/')); var_dump(basename('/asdf')); var_dump(basename('dfg'));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0, 7.0.0 - 7.1.0
string(0) "" string(0) "" string(4) "asdf" string(3) "dfg"
Output for hhvm-3.12.0
Warning: basename() expects parameter 1 to be string, null given in /in/eQhVN on line 3 NULL string(0) "" string(4) "asdf" string(3) "dfg"