PHP读取TXT指定行的数据解决方法
PHP读取TXT指定行的数据
现在有一个很大的TXT，大小超过了内存的大小（假设哈），
要替换部分文字，
如果直接读取肯定不行，内存不够。
我想了一个办法就是循环读取，
先读取1000行，操作，然后清空变量，循环读取下1000行，
file_get_contents（）这个函数好像是一下子读取所有的内容，
不知道有没有其他函数或方法。
------解决方案--------------------
fgets 一次一行
fread 一次一块（指定大小）
如需直接修改源文件，打开时用 r+ 方式
回写时需用 fseek 定位文件指针，偏移用 ftell 取回
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