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run code in 150+ php & hhvm versions
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<?php $mxHosts = array(); var_dump(getmxrr("www.yahoo.com", $mxHosts)); var_dump($mxHosts); var_dump(get_dns_record("www.yahoo.com"));
Output for 7.0.0 - 7.1.0
bool(false) array(0) { } Fatal error: Uncaught Error: Call to undefined function get_dns_record() in /in/ZlFN8:5 Stack trace: #0 {main} thrown in /in/ZlFN8 on line 5
Process exited with code 255.
Output for hhvm-3.12.0
bool(false) NULL Fatal error: Call to undefined function get_dns_record() in /in/ZlFN8 on line 5
Process exited with code 255.
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.0.0 - 5.6.28
bool(false) array(0) { } Fatal error: Call to undefined function get_dns_record() in /in/ZlFN8 on line 5
Process exited with code 255.
Output for 4.4.5 - 4.4.9
bool(false) array(0) { } Fatal error: Call to undefined function: get_dns_record() in /in/ZlFN8 on line 5
Process exited with code 255.
Output for 4.3.2 - 4.4.4
bool(false) array(0) { } Fatal error: Call to undefined function: get_dns_record() in /in/ZlFN8 on line 5
Process exited with code 255.
Output for 4.3.0 - 4.3.1
bool(false) array(0) { } Fatal error: Call to undefined function: get_dns_record() in /in/ZlFN8 on line 5