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run code in 150+ php & hhvm versions
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<?php var_dump( function_exists( 'ini_set' ), is_callable( 'ini_set' ) );
Output for 4.3.0, 5.4.34 - 7.1.0
bool(true) bool(true)
Output for 4.3.1 - 5.4.32
bool(false) bool(true)