最小的内存密集的方式来读取PHP中的文件 [英] Least memory intensive way to read a file in PHP

问题描述

我正在使用Php中的file（）函数读取包含大约50k行的文件。但是，由于文件的内容作为数组存储在存储器中，所以它的内存不足错误。有没有其他的方法？

I am reading a file containing around 50k lines using the file() function in Php. However, its giving a out of memory error since the contents of the file are stored in the memory as an array. Is there any other way?

另外，存储的行的长度是可变的。

Also, the lengths of the lines stored are variable.

这里是代码。另外文件是700kB不是mB。

Here's the code. Also the file is 700kB not mB.

private static function readScoreFile($scoreFile)
{
    $file = file($scoreFile);
    $relations = array();

    for($i = 1; $i < count($file); $i++)
    {
        $relation = explode("\t",trim($file[$i]));
        $relation = array(
                        'pwId_1' => $relation[0],
                        'pwId_2' => $relation[1],
                        'score' => $relation[2],
                        );
        if($relation['score'] > 0)
        {
            $relations[] = $relation;
        }
    }

    unset($file);
    return $relations;
}

推荐答案

使用 fopen ， fread 和 fclose 顺序读取文件：

Use fopen, fread and fclose to read a file sequentially:

$handle = fopen($filename, 'r');
if ($handle) {
    while (!feof($handle)) {
        echo fread($handle, 8192);
    }
    fclose($handle);
}

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