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run code in 200+ php & hhvm versions
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<?php $val = [ ]; $ternary = $val['exists'] ?: 'no-tern'; $nullCo = $val['exists'] ?? 'no-null'; var_dump($ternary, $nullCo);
based on 0CPoO
Output for 7.0.0 - 7.2.0
Notice: Undefined index: exists in /in/UjAGs on line 6 string(7) "no-tern" string(7) "no-null"
Output for 5.4.0 - 5.6.28
Parse error: syntax error, unexpected '?' in /in/UjAGs on line 7
Process exited with code 255.
Output for 5.3.19 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/UjAGs on line 3
Process exited with code 255.