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<?php $data = []; $required =['validation' => 0, 'http_verb' => 1, 'response' => 2, 'url' => 3]; //we only care about the keys of this array $missingKeys = array_diff_key($required, $data); $missingCount = sizeof($missingKeys); if ($missingCount > 1) { var_dump(implode(', ', array_flip($missingKeys))); }
Output for git.master, git.master_jit, rfc.property-hooks
string(36) "validation, http_verb, response, url"

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