fopen()的使用

fopen(filename,mode,include_path,context)

Parameter参数	Description描述
filename	Required. Specifies the file or URL to open 必要参数。指定需要打开的文件和URL
mode	Required. Specifies the type of access you require to the file/stream. 必要参数。指定需要访问的文件类型 Possible values: 可用值： "r" (Read only. Starts at the beginning of the file) “r”（只读格式。始于文件的开头） "r+" (Read/Write. Starts at the beginning of the file) “r+”（可读/可写。始于文件的开头） "w" (Write only. Opens and clears the contents of file; or creates a new file if it doesn't exist) “w”（只写格式。打开或清除文件的内容；或者创建一个不存在的文件） "w+" (Read/Write. Opens and clears the contents of file; or creates a new file if it doesn't exist) “w+”（可读/可写。打开或清除文件的内容；或创建一个不存在的新文件） "a" (Write only. Opens and writes to the end of the file or creates a new file if it doesn't exist) “a”（只写格式。打开文件，并在文件的末尾处书写内容；或创建一个新的文件） "a+" (Read/Write. Preserves file content by writing to the end of the file) “a+”（可读/可写。通过在文件的末尾书写内容来保存文件的内容） "x" (Write only. Creates a new file. Returns FALSE and an error if file already exists) “x”（只写格式。创建一个新的文件） "x+" (Read/Write. Creates a new file. Returns FALSE and an error if file already exists) “x+”（可读/可写。创建一个新的文件。如果文件已经存在，则返回False或产生一个错误）
include_path	Optional. Set this parameter to '1' if you want to search for the file in the include_path (in php.ini) as well 可选参数。如果你想在include_path（位于php.ini文件中）搜索，将这个参数设置为“1”
context	Optional. Specifies the context of the file handle. Context is a set of options that can modify the behavior of a stream 可选参数。指定需要处理的文件内容[context]。Context是一组选项，它是用来修改文本流特征的。