[]php处理俩个文本的效率有关问题

<!--?php<br /-->/*<br><br>==> 1.txt <==<br>a:123<br>b:1333<br>c:333<br><br>==> 2.txt <==<br>a:3333<br>aa:3433<br>c:323dfa<br><br>==> result.txt <==<br>a:123:3333<br>c:333:323dfa<br><br>*/<br><br><br>$file_1 = "1.txt";<br>$file_2 = "2.txt";<br><br>$f = fopen("$file_1", 'r') or die("Cann't Open the file.");<br><br>while (!(feof($f))) {<br>        $line = explode(':', trim(fgets($f)));<br>        $f2 = fopen("$file_2", 'r') or die("Cann't Open the file.");<br>        while (!(feof($f2))) {<br>                $line2 = explode(':', trim(fgets($f2)));<br>                if ($line[0] == $line2[0]) {<br>                        $line[] = $line2[1];<br>                        $aaaa = implode(":",$line);<br>                        $output_file = fopen("./result.txt", 'a');<br>                        echo "$aaaa\n";<br>                        fwrite($output_file, "$aaaa\n");<br>                        fclose($output_file);<br>                }<br><br>        }<br>}<br>?>

$t = file('data/1.txt', FILE_IGNORE_NEW_LINES);<br>foreach($t as $v) {<br>  list($k, $v) = explode(':', $v);<br>  $a[$k][] = $v;<br>}<br>$t = file('data/2.txt', FILE_IGNORE_NEW_LINES);<br>foreach($t as $v) {<br>  list($k, $v) = explode(':', $v);<br>  $b[$k][] = $v;<br>}<br>foreach($a as $k=>$v) {<br>  if(isset($b[$k])) {<br>    file_put_contents('data/result.txt', join(':', array_merge(array($k), $v, $b[$k])). PHP_EOL, FILE_APPEND);<br>  }<br>}