在 PHP 中读取文件的最少内存密集方式 [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，它给出了内存不足错误，因为文件的内容作为数组存储在内存中.还有其他办法吗?

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?

此外，存储的行的长度是可变的.

Also, the lengths of the lines stored are variable.

这是代码.此外，该文件是 700kB 而不是 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++)
    {
        $relation = explode("	",trim($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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