PHP File Processing - Open/Close File
What is file processing?
File processing includes reading, closing, rewriting, etc. Mastering file processing requires readers to clarify their thinking and master the key steps and common functions of file processing, so that they can use it freely!
For example, accessing a file requires 3 steps: opening the file, reading and writing the file, and closing the file. Other operations on files are either included in reading and writing files (such as displaying content, writing content, etc.), or are related to the attributes of the file itself (such as file traversal, file renaming, etc.). So starting from this article, we will give a detailed introduction to commonly used file processing technologies.
In today’s article, we will first introduce Opening/closing files. To open and close files, use the fopen() function and fclose() function. You should be extremely careful when opening files, because you may delete all the contents of the file if you are not careful.
1: Open the file
When operating a file, the first thing we have to do is open the file. This is The first step in data access. Use the fopen() function to open a file in PHP. The syntax of the fopen() function is as follows:
resource fopen ( string $filename , string $mode [, bool $use_include_path = false [, resource $context ]] )
The parameter filename is the file name containing the path to be opened, which can be a relative path or an absolute path. If there is no prefix on the side, it means that the local file is being opened. The parameter mode is the way to open the file. The possible values ??are as follows:
| mode | Mode name | Description |
| r | Read only | Read mode—read, the file pointer is at the beginning of the file |
| r+ | Read and write | Read and write mode—read For reading and writing, the file pointer is at the beginning of the file. Writing before the end of the contents of an existing file will overwrite the original |
| W | Write only | Write mode—write Enter the file, and the file pointer points to the header file. If the file exists, all file contents are deleted, otherwise the function will create the file |
| w+ | Read and write | Read and write mode—for reading When writing, the file pointer points to the header file. If the file exists, all file contents are deleted, otherwise the function will create the file |
| x | Write with caution | Open the file in write mode, from the file Start writing. If the file already exists, the file will not be opened, the function returns false, and PHP will generate a warning |
| x+ | Write with caution | Open the file in read/write mode and start writing from the beginning of the file. If the file already exists, the file will not be opened, the function returns false, and PHP will generate a warning |
| a | Append | Append mode Open the file, and the file pointer points to the tail file. If the file already has content, it will be appended from the end of the file. If the file does not exist, the function will create the file |
| a+ | Append | Open the file in append mode, and the file pointer points to the header file. If the file already has content, it will be appended or read from the end of the file. If the file does not exist, the function will Create this file |
| b | binary | Binary mode - used to connect with other modes. This may be used if the file system can differentiate between binary files and text files. Windows can differentiate; UNIX does not. This option is recommended for maximum portability. It is the default mode |
| t | text | used in combination with other modes. This mode is only an option under Windows |
第三個(gè)參數(shù) use_include_path 是可選的，該參數(shù)在配置文件 php.ini 中指定一個(gè)路徑，如F:\AppServ\www\mess.php，如果希望服務(wù)器在這個(gè)路徑下打開所指定的文件，可以將其值上設(shè)置為 1 或者 true。
二：關(guān)閉文件
對文件的操作結(jié)束后應(yīng)該關(guān)閉這個(gè)文件，否則可能會(huì)引起錯(cuò)誤。在 PHP 中使用 fclose()函數(shù)關(guān)閉文件，該函數(shù)的語法格式如下;
bool fclose ( resource $handle )
該函數(shù)將參數(shù) handle 指向的文件關(guān)閉，如果成功，那么返回true，否則返回false。其中的文件指針必須是有效的，并且是通過 fopen()函數(shù)成功打開的文件。
具體我們看下下面的示例代碼：
<?php
header("Content-Type:text/html; charset=utf-8");
$f_open = fopen("../file.txt","rb"); // 打開文件
................. //這里是對文件進(jìn)行操作
fclose($f_open) //操作完成后關(guān)閉文件
?>打開/關(guān)閉文件就介紹到這里，下一篇我們介紹《PHP文件處理—讀取文件(一個(gè)字符,字串)》！
The above is the detailed content of PHP file handling - open/close files. For more information, please follow other related articles on the PHP Chinese website!
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