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run code in 150+ php & hhvm versions
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<?php $upgradeKeys = array( 'featured-listing', 'basic-pack', 'designer-blog', 'power-pack' ); $_upgradeKeys = array_diff( $upgradeKeys, array( 'featured-listing', 'basic-pack', 'designer-blog', 'power-pack' ) ); sort($_upgradeKeys); $upgradeKeys = $_upgradeKeys; $upgradeKeys[] = 'power-pack'; echo upgradeKeys[0];
based on cYn41
Output for 5.6.8 - 5.6.28, 7.0.0 - 7.1.0
Notice: Use of undefined constant upgradeKeys - assumed 'upgradeKeys' in /in/nSCXb on line 22 u
Output for hhvm-3.12.0
Fatal error: syntax error, unexpected '[', expecting ',' or ';' in /in/nSCXb on line 22
Process exited with code 255.
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.5.35
Parse error: syntax error, unexpected '[', expecting ',' or ';' in /in/nSCXb on line 22
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[', expecting ',' or ';' in /in/nSCXb on line 22
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `','' or `';'' in /in/nSCXb on line 22
Process exited with code 255.