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<?php print_r(ini_get_all("pcre"));
Output for 7.0.0 - 7.1.0
Array ( [pcre.backtrack_limit] => Array ( [global_value] => 1000000 [local_value] => 1000000 [access] => 7 ) [pcre.jit] => Array ( [global_value] => 1 [local_value] => 1 [access] => 7 ) [pcre.recursion_limit] => Array ( [global_value] => 100000 [local_value] => 100000 [access] => 7 ) )
Output for hhvm-3.12.0
Array ( [hhvm.pcre.jit] => Array ( [global_value] => 1 [local_value] => 1 [access] => 4 ) [pcre.backtrack_limit] => Array ( [global_value] => 1000000 [local_value] => 1000000 [access] => 7 ) [pcre.recursion_limit] => Array ( [global_value] => 100000 [local_value] => 100000 [access] => 7 ) )
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.3.7 - 5.6.28
Array ( [pcre.backtrack_limit] => Array ( [global_value] => 1000000 [local_value] => 1000000 [access] => 7 ) [pcre.recursion_limit] => Array ( [global_value] => 100000 [local_value] => 100000 [access] => 7 ) )
Output for 5.2.0 - 5.3.6
Array ( [pcre.backtrack_limit] => Array ( [global_value] => 100000 [local_value] => 100000 [access] => 7 ) [pcre.recursion_limit] => Array ( [global_value] => 100000 [local_value] => 100000 [access] => 7 ) )
Output for 4.3.0 - 5.1.6
Array ( )