如何在文件中搜索文本然后将其删除？

Question

Let's say the content in my txt file is:

Hello! This is a test file!

Continued...

I understood that the content of the file should be read first:

<?php
$file = file_get_contents("test.txt");

How do I continue? To search for the text: 'Continued...' delete it, and save the file again.

(Without destroying the rest of the content)

Answer 1

<?php
$file = file_get_contents("test.txt");
$newfileContetnt = str_replace('Continued...', '', $file);
file_put_conetnt($newfileContetnt);