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回復討論(解決方案)
? ??? ?? PHP ???? php處理倆個文本的效率問題

php處理倆個文本的效率問題

Jun 20, 2016 pm 12:47 PM 

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

如代碼所示，將1.txt和2.txt整理輸出到一個新文件result.txt, 效果如注釋部分。我寫的代碼處理的條數少的時候沒發(fā)現問題，當倆個文本都有十幾萬條記錄的時候，效率就出大事了，要整理10來個小時。初學PHP，求大師指點。


回復討論(解決方案)

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

沒有嵌套的循環(huán)，不會太慢的 

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

沒有嵌套的循環(huán)，不會太慢的



1.txt?2.89M，?2.txt?3.12M
運行之后提示：
PHP?Fatal?error:??Allowed?memory?size?of?134217728?bytes?exhausted?(tried?to?allocate?32?bytes)
php.ini里設置的是memory_limit?=?128M，一下就用光了嗎？

會有這種事？文件并不大嘛。
可能是其他的原因

你把這兩個文件放到云盤上

直接設置?memory_limit?=?1024M，速度快多了，非常感謝@xuzuning。

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