我沒有處理大文件的經(jīng)驗，所以我不確定該怎么辦。我試圖使用 file_get_contents 讀取幾個大文件；任務是使用

preg_replace() 清潔和修補它們。

我的代碼在小文件上運行良好；但是，大文件(40 MB)觸發(fā)內(nèi)存耗盡錯誤：

PHP Fatal error: Allowed memory size of 16777216 bytes exhausted (tried to allocate 41390283 bytes)

我當時在考慮使用 fread()， 但是我不確定那也行。有解決此問題的方法嗎？

感謝您的輸入。

這是我的代碼：

error_reporting(E_ALL);

##get find() results and remove DOS carriage returns.

##The error is thrown on the next line for large files!

$myData = file_get_contents("tmp11");

$newData = str_replace("^M", "", $myData);

##cleanup Model-Manufacturer field.

$pattern = '/(Model-Manufacturer:)(\n)(\w+)/i';

$replacement = '$1$3';

$newData = preg_replace($pattern, $replacement, $newData);

##cleanup Test_Version field and create comma delimited layout.

$pattern = '/(Test_Version=)(\d).(\d).(\d)(\n+)/';

$replacement = '$1$2.$3.$4 ';

$newData = preg_replace($pattern, $replacement, $newData);

##cleanup occasional empty Model-Manufacturer field.

$pattern = '/(Test_Version=)(\d).(\d).(\d) (Test_Version=)/';

$replacement = '$1$2.$3.$4 Model-Manufacturer:N/A--$5';

$newData = preg_replace($pattern, $replacement, $newData);

##fix occasional Model-Manufacturer being incorrectly wrapped.

$newData = str_replace("--","\n",$newData);

##fix 'Binary file' message when find() utility cannot id file.

$pattern = '/(Binary file).*/';

$replacement = '';

$newData = preg_replace($pattern, $replacement, $newData);

$newData = removeEmptyLines($newData);

##replace colon with equal sign

$newData = str_replace("Model-Manufacturer:","Model-Manufacturer=",$newData);

##file stuff

$fh2 = fopen("tmp2","w");

fwrite($fh2, $newData);

fclose($fh2);

### Functions.

##Data cleanup

function removeEmptyLines($string)

{

return preg_replace("/(^[\r\n]*|[\r\n]+)[\s\t]*[\r\n]+/", "\n", $string);

}

?>

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