How to replace a certain line of content in php

How to replace the content of a certain line in php: 1. Use the file function to read the file; 2. Get the content of the current line and modify the content through "$fp->write("hello");" .

The operating environment of this article: Windows7 system, PHP7.1 version, Dell G3 computer

How to replace a certain line in php?

php replaces the content of the specified line in the file

The first type

Use the file function to read the file, each line is an array Element

 $arr =  file($file);
 $arr[$line] = "hello";
 file_put_contents($file, implode("", $arr))

The second type

 $fp = new \SplFileObject('./test.php', 'r+');
 //转到第二行, seek方法参数从0开始计数, 经我测试指针指向行尾了, 所以修改的是第三行
 $fp->seek(1);
 //获取当前行内容(第二行)
 $line = $fp->current();
 $fp->write("hello");

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