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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