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<?php $hola = null; var_dump( $hola??'no definido' ); echo "\n"; $hola = false; var_dump( $hola??'no definido' );
based on Hd8Wq
Output for 7.0.0 - 7.2.0
string(11) "no definido" bool(false)
Output for 5.3.20 - 5.6.28
Parse error: syntax error, unexpected '?' in /in/dRanq on line 4
Process exited with code 255.