如何建一串字符写入某文件的开头

Question

假设某文件为a.php
内容为：JJJJJJJJJJJJJJJJJJJJJJJ;
通过程序使a.php 文件开头插入一串字符串的 字符串+JJJJJJJJJJJJJJJJJJJ

Answer 1

最简单的做法先把文件内容用file_get_contents()读到个字符串里
再在这个字符串前加上你要加的字符串
然后再写回文件a.php
麻烦点的做法就是用fopen()，参数r+

Answer 2

呵呵
$temp=file_get_contents("a.php");
$add_str="要添加的字符串";
file_put_contents("a.php",$add_str.$temp);