Table of Contents
定义和用法
语法
mode 参数的可能的值
说明
Home php教程 php手册 PHP最简单写文件记日志当前时间

PHP最简单写文件记日志当前时间

Jun 06, 2016 pm 07:54 PM
php document log time usage

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)
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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)
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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);
?>
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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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