海运的博客

<?php
 function getFileLines($filename, $startLine = 1, $endLine = 50, $method = 'rb'){
     $content = array();
    
     if (version_compare(PHP_VERSION, '5.1.0', '>=')){ // 5.1版本之上使用Splfileobject
         $count = $endLine - $startLine;
         $fp = new SplFileObject($filename, $method);
         $fp -> seek($startLine - 1); // 转到$startLine行,seek方法从0开始计数
         for ($i = 0; $i <= $count; ++$i){
             $content[] = trim(($fp -> current()), "\n"); //current()方法取当前行清除换行保存到数组
             $fp -> next(); //循环下一行
             }
         }else{ // PHP<5.1
         $fp = fopen($filename, $method);
         if (!$fp)
             return 'error:can not read file';
         for ($i = 1; $i < $startLine; ++$i){ //定位到$startLine行
             fgets($fp);
            }
        
        for ($i; $i <= $endLine; ++$i){
             $content[] = fgets($fp); //从$startLine行开始循环读取到$endLine行
            }
        fclose($fp);
        }
    return array_filter($content); //返回array_filter(flase,null,0)过滤后的数组
    }
?>

示例：

<?php
$filename = 'file.txt';
$start = 1;
$end = 10;
$count = $end - $start;
while (true){
     $data = getFileLines($filename, $start, $end);
     // var_dump($data);
    $rev = ver($data);
     if($data[9] == ''){
         die("End");
         sleep(10);
        }
    $start = $start + 10;
    $end = $end + 10;
    }
?>

标签：php