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<?php $arr = []; $arr[2] = ['error_code' => 'a']; $arr[4] = ['error_code' => 'b']; $result = []; $result['bad_lines'] = (object)array_map(function($line) { return $line['error_code']; }, $arr); echo json_encode($result);
Output for git.master, git.master_jit, rfc.property-hooks
{"bad_lines":{"2":"a","4":"b"}}

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