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<?php $array = ['1' => 'A', '2' => null, '3' => 0]; foreach (['1', '2', '3', '4'] as $test) { var_export(isset($array[$test]) ? $array[$test] : '-'); echo " , "; var_export(key_exists($test, $array) ? $array[$test] : '-'); echo " , "; var_export(array_key_exists($test, $array) ? $array[$test] : '-'); echo " , "; var_export($array[$test] ?? '-'); echo "\n"; }
Output for git.master, git.master_jit, rfc.property-hooks
'A' , 'A' , 'A' , 'A' '-' , NULL , NULL , '-' 0 , 0 , 0 , 0 '-' , '-' , '-' , '-'

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