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PHP reads a certain line of data from a large file text TEXT

高洛峰

Oct 14, 2016 am 10:30 AM

function get_line($file,$line) {
    $fp = fopen($file,&#39;r&#39;);
    $i = 0;
    while(!feof($fp)) {
        $i++;
        $c = fgets($fp);
        if($i==$line) {
            echo $c;
            break;
        }
    }
}

這個(gè)方式效率仍待考驗(yàn)
在一個(gè)apache的日志文件中（450M）
讀取第20行非常之快 0.001039981842041
讀取第200行0.0033199787139893
讀取第2萬行需要0.30908799171448 秒左右
讀取第20萬行2.5622429847717 seconds 已經(jīng)到了無法忍受的地步

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