PHP第一次将字符串写入新行,而不是在文件末尾 [英] PHP Write string to new line for the first time and not at the end of file

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问题描述

使用Codeigniter函数 write_file(),我可以这样写到现有文件:

Using Codeigniter function write_file(), I can write to an existing file like this:

write_file("path_to_file", "String four"."\n", "a+");

假设我已经有一个这样的文件:

Assume I already have a file like this:

String one
String two
String three

使用 write_file( path_to_file,字符串四。 \n, a +),我在写文件时有以下输出第一次:

With write_file("path_to_file", "String four"."\n", "a+") , I have the ouput below when writing to file for the first time:

String one
String two
String three String four

关于如何第一次将字符串四写入新行的任何想法?如下所示:

Any idea about how I can write String four to new line for the first time? Like shown below:

String one
String two
String three 
String four

谢谢。

推荐答案

对此write_file()函数了解不多,但是按照您所说的,这应该可以工作:

Not knowing much about this write_file() function, but given what you said, this should work :

write_file("path_to_file", "\n"."String four"."\n", "a+")

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