How to delete text file content in php

php method to delete the content of a text file: first create a PHP sample file; then define the operation file and determine the row keywords to be deleted; then read the file data into an array; and finally delete the specified content of the file. .

The operating environment of this article: windows7 system, PHP7.1 version, DELL G3 computer

How to delete the content of text files with php?

The code is as follows:

<?php
$filename="aaa.txt";//定义操作文件
$dellinekey=&#39;13800&#39;; //要删除的行关键字
$delcount=0;//已删除的行数
$farray=file($filename);//读取文件数据到数组中
for($i=0;$i<count($farray);$i++)
{   
  if($delcount == 0 && substr_count($farray[$i],$dellinekey) > 0)  //先判断是否已删除一次，再判断当前行是否包含关键字，是则删除
  {   
     $delcount++;//标记删除一次
    continue;
  }   
  if(trim($farray[$i])<>"")  //删除文件中的所有空行
  {   
      $newfp.=$farray[$i];    //重新整理后的数据
  }   
}   
$fp=@fopen($filename,"w");//以写的方式打开文件
@fputs($fp,$newfp);
@fclose($fp);
?>

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