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<?php $val = [ ]; $ternary = $val['exists'] ?: 'no-tern'; $nullCo = $val['exists'] ?? 'no-null'; var_dump($ternary, $nullCo);
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined array key "exists" in /in/UjAGs on line 6 string(7) "no-tern" string(7) "no-null"

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