定义和用法 fopen() 函数打开文件或者 URL。 如果打开失败,本函数返回 FALSE。 语法 fopen(filename,mode,include_path,context) 参数 描述 filename 必需。规定要打开的文件或 URL。 mode 必需。规定要求到该文件/流的访问类型。可能的值见下表。 include_
定义和用法
fopen() 函数打开文件或者 URL。
如果打开失败,本函数返回 FALSE。
语法
fopen(filename,mode,include_path,context)
参数 | 描述 |
---|---|
filename | 必需。规定要打开的文件或 URL。 |
mode | 必需。规定要求到该文件/流的访问类型。可能的值见下表。 |
include_path | 可选。如果也需要在 include_path 中检索文件的话,可以将该参数设为 1 或 TRUE。 |
context | 可选。规定文件句柄的环境。Context 是可以修改流的行为的一套选项。 |
mode 参数的可能的值
mode | 说明 |
---|---|
"r" | 只读方式打开,将文件指针指向文件头。 |
"r+" | 读写方式打开,将文件指针指向文件头。 |
"w" | 写入方式打开,将文件指针指向文件头并将文件大小截为零。如果文件不存在则尝试创建之。 |
"w+" | 读写方式打开,将文件指针指向文件头并将文件大小截为零。如果文件不存在则尝试创建之。 |
"a" | 写入方式打开,将文件指针指向文件末尾。如果文件不存在则尝试创建之。 |
"a+" | 读写方式打开,将文件指针指向文件末尾。如果文件不存在则尝试创建之。 |
"x" |
创建并以写入方式打开,将文件指针指向文件头。如果文件已存在,则 fopen() 调用失败并返回 FALSE,并生成一条 E_WARNING 级别的错误信息。如果文件不存在则尝试创建之。 这和给底层的 open(2) 系统调用指定 O_EXCL|O_CREAT 标记是等价的。 此选项被 PHP 4.3.2 以及以后的版本所支持,仅能用于本地文件。 |
"x+" |
创建并以读写方式打开,将文件指针指向文件头。如果文件已存在,则 fopen() 调用失败并返回 FALSE,并生成一条 E_WARNING 级别的错误信息。如果文件不存在则尝试创建之。 这和给底层的 open(2) 系统调用指定 O_EXCL|O_CREAT 标记是等价的。 此选项被 PHP 4.3.2 以及以后的版本所支持,仅能用于本地文件。 |
定义和用法
fwrite() 函数写入文件(可安全用于二进制文件)。
语法
fwrite(file,string,length)
参数 | 描述 |
---|---|
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。 |
说明
fwrite() 把 string 的内容写入文件指针 file 处。 如果指定了 length,当写入了 length 个字节或者写完了 string 以后,写入就会停止,视乎先碰到哪种情况。
fwrite() 返回写入的字符数,出现错误时则返回 false。
<?php $file = fopen("log.txt","w"); echo fwrite($file,date("Y-m-d H:i:s")); fclose($file); ?>
注意要给文件权限:
#chmod 0666 log.txt
输出21说明写入成功

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