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run code in 150+ php & hhvm versions
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<?php $query = http_build_query(array( array('type' => 'eq', 'field' => 'group', 'value' => '1') )); echo $query;
Output for 5.1.3 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
0%5Btype%5D=eq&0%5Bfield%5D=group&0%5Bvalue%5D=1
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.0.0 - 5.1.2
0[type]=eq&0[field]=group&0[value]=1
Output for 4.4.5 - 4.4.9
Fatal error: Call to undefined function: http_build_query() in /in/Y0oMf on line 2
Process exited with code 255.
Output for 4.3.2 - 4.4.4
Fatal error: Call to undefined function: http_build_query() in /in/Y0oMf on line 2
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Call to undefined function: http_build_query() in /in/Y0oMf on line 2