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run code in 200+ php & hhvm versions
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<?php $null = null; $zero = 0; var_dump( is_null( $null ),is_null( $zero ) );
Output for 4.3.0 - 5.6.30, hhvm-3.10.1 - 3.17.3, 7.0.0 - 7.2.0
bool(true) bool(false)