大数据文件和小数据文件读取

小数据文件：file_get_contents

大数据:fgets

<?php

        $file = "log.txt";
        $handle = @fopen($file, "r");
        $begin_arr = explode(" ", microtime());
        echo "start: ".$begin_arr[1]."<br>";
        if ($handle)
        {
              flock($handle, LOCK_EX);//只有file函数读写才能有效
            $i = 1;
            while (!feof($handle))
            {
                $buffer = fgets($handle);
                $i++;
            }
             echo  "<br>run: ".$i;
             
              $end_arr = explode(" ", microtime());
             echo "end: ".$end_arr[1]."<br>";
            echo $end_arr[1] -$begin_arr[1];
            flock($handle, LOCK_UN);
            fclose($handle);
        }
?>