How to delete a certain line of a file in php

How to delete a certain line of a file in php: first define the operation file; then read the file data into an array; and finally delete the specified line of the existing text file.

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

How to delete a certain line of a file with php?

PHP Delete any line of the text file or add a line

Delete the specified line of the actual existing text file. This line can be arbitrary, that is, it is decided by the user. Deleting any line in a text file is very meaningful. For example, we use a text file to record relevant information about registered users (one piece of information per line), and now we need to delete one of them.

"") //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); ?>

The text file aaa.txt is as follows:

10.8.0.1:255.255.255.0 10.8.0.2:255.255.255.0 10.8.0.3:255.255.255.0 10.8.0.4:255.255.255.0 10.8.0.5:255.255.255.0 10.8.0.6:255.255.255.0 10.8.0.8:255.255.255.0

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