PHP file Operations-add data from other files to this file

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GitHub source
In fact our program is based on the following questions written by the answer:

There are two text files A.txt B.txt
A.txt 30 million lines, UserID unique, UserID and username are separated by spaces, as follows:
UserID username
1 Yi
2 ER
3 San
... ...
B.txt 30 million lines, UserID unique, UserID and realname are separated by spaces, as follows:
UserID Realname
11
22
33
... ...
Please write a code that will B.txt the userid corresponding to the username in A.txt, fill in the third column of B.txt, and give the time complexity.

In our program, the default two file row data is one by one corresponding, that is, the nth row of a data corresponding to the nth row of B data, so that our program's time complexity is O (n).

But in the actual operation, will certainly encounter two files data row is not one by one corresponding case, so I only think of the simplest time complexity for O (n^2) operation, do not know there is no better algorithm to solve the problem.

If a file is read out and constructed as a data structure with an O (1) or O (logn) query, it should be complex to be O (n) or O (Nlogn), but how to deal with a file that is too large to be built, and how to use the database B-tree indexing approach?

<?phpheader ("content-type:text/html;charset=utf-8"); function Decodeline (string $lineData, String $delimiter =    NULL) {if (Is_null ($delimiter)) {$delimiter = '; } return explode ($delimiter, $lineData);}    function Encodeline (array $dataList, string $delimiter = null) {if (Is_null ($delimiter)) {$delimiter = '; } return Implode ($delimiter, $dataList);} $testA = fopen ('./testdata/fileoperation/testa.txt ', ' R '); $testB = fopen ('./testdata/fileoperation/testb.txt ', ' r+ ')    ; $tmpFile = Tmpfile ();//while (($bBuffer = fgets ($testB)) = False) {$bList = Decodeline (Trim ($bBuffer, "\n\r"));    $tmpList = $bList;        if ($aBuffer = fgets ($testA)) = False) {$aList = Decodeline (Trim ($aBuffer, "\n\r"));            if ($aList [0] = = $bList [0]) {$strEncoding = Mb_detect_encoding ($aList [1], [' ASCII ', ' UTF-8 ', ' GB2312 ']);            $RESSTR = mb_convert_encoding ($aList [1], ' UTF-8 ', $strEncoding); Array_push ($tmpList, $resStr. "        \ n ");   } } fwrite ($tmpFile, Encodeline ($tmpList));}    Rewind ($tmpFile); rewind ($testB); while (!feof ($tmpFile)) {$tmpBuffer = Fread ($tmpFile, 1024); Fwrite ($testB, $tmpBuffer);} Fclose ($tmpFile); fclose ($testA); fclose ($testB);

GitHub source
In fact our program is based on the following questions written by the answer:

There are two text files A.txt B.txt
A.txt 30 million lines, UserID unique, UserID and username are separated by spaces, as follows:
UserID username
1 Yi
2 ER
3 San
... ...
B.txt 30 million lines, UserID unique, UserID and realname are separated by spaces, as follows:
UserID Realname
11
22
33
... ...
Please write a code that will B.txt the userid corresponding to the username in A.txt, fill in the third column of B.txt, and give the time complexity.

In our program, the default two file row data is one by one corresponding, that is, the nth row of a data corresponding to the nth row of B data, so that our program's time complexity is O (n).

But in the actual operation, will certainly encounter two files data row is not one by one corresponding case, so I only think of the simplest time complexity for O (n^2) operation, do not know there is no better algorithm to solve the problem.

If a file is read out and constructed as a data structure with an O (1) or O (logn) query, it should be complex to be O (n) or O (Nlogn), but how to deal with a file that is too large to be built, and how to use the database B-tree indexing approach?

<?phpheader ("content-type:text/html;charset=utf-8"); function Decodeline (string $lineData, String $delimiter =    NULL) {if (Is_null ($delimiter)) {$delimiter = '; } return explode ($delimiter, $lineData);}    function Encodeline (array $dataList, string $delimiter = null) {if (Is_null ($delimiter)) {$delimiter = '; } return Implode ($delimiter, $dataList);} $testA = fopen ('./testdata/fileoperation/testa.txt ', ' R '); $testB = fopen ('./testdata/fileoperation/testb.txt ', ' r+ ')    ; $tmpFile = Tmpfile ();//while (($bBuffer = fgets ($testB)) = False) {$bList = Decodeline (Trim ($bBuffer, "\n\r"));    $tmpList = $bList;        if ($aBuffer = fgets ($testA)) = False) {$aList = Decodeline (Trim ($aBuffer, "\n\r"));            if ($aList [0] = = $bList [0]) {$strEncoding = Mb_detect_encoding ($aList [1], [' ASCII ', ' UTF-8 ', ' GB2312 ']);            $RESSTR = mb_convert_encoding ($aList [1], ' UTF-8 ', $strEncoding); Array_push ($tmpList, $resStr. "        \ n ");   } } fwrite ($tmpFile, Encodeline ($tmpList));}    Rewind ($tmpFile); rewind ($testB); while (!feof ($tmpFile)) {$tmpBuffer = Fread ($tmpFile, 1024); Fwrite ($testB, $tmpBuffer);} Fclose ($tmpFile); fclose ($testA); fclose ($testB);