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run code in 150+ php & hhvm versions
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<?php $arr = array('order_source' => 'google', 'order_medium' => 'google-text'); echo http_build_query($arr);
Output for 5.0.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
order_source=google&order_medium=google-text
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.4.5 - 4.4.9
Fatal error: Call to undefined function: http_build_query() in /in/4ZYAf on line 3
Process exited with code 255.
Output for 4.3.2 - 4.4.4
Fatal error: Call to undefined function: http_build_query() in /in/4ZYAf on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Call to undefined function: http_build_query() in /in/4ZYAf on line 3