php中写文件函数实例程序
在php中写文件有几种,一种是利用fopen与fwirte函数实现,另一种是利用file_put_contents实现读写,下面我来介绍它们用法。
方法一,利用fopen与fwirte函数实现
1,PHP如何打开文件
使用PHP函数fopen()打开一个文件,fopen()一般使用2个参数表示打开文件的路径和文件模式。比如:
代码如下 | 复制代码 |
$fp=fopen("../cnbruce.txt",'w'); |
其中 "../cnbruce.txt" 就表示打开的cnbruce.txt文件的路径(相对当前执行程序文件的路径),'w'表示以只写的方式打开该文本文件。
写文件用
fwrite(file,string,length)
参数说明:
file 必需。规定要写入的打开文件。
string 必需。规定要写入文件的字符串。
length 可选。规定要写入的最大字节数。
例
代码如下 | 复制代码 |
/** |
方法二,利用file_put_contents实现读写
file_put_contents函数有个参数LOCK_EX非常有用,加上它之后,再也没有出现过内容缺失的情况了。
这个参数LOCK_EX的意思很直白,就是写文件时,先锁上这个文件,这样只允许某个客户端访问的时候写,其他客户端访问不能写了。
我的用法如下:
代码如下 | 复制代码 |
file_put_contents($file, $content, FILE_APPEND|LOCK_EX) |
解释:
$file=>这个是写入文件的路径+文件名
$content=>这个是写入文件的内容
FILE_APPEND=>直接在该文件已有的内容后面追加内容
LOCK_EX=>写文件的时候先锁定,防止多人同时写入造成内容丢失

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