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PHP is a high-level programming language widely used in website development and back-end services. As developers, we need to handle a large number of files, such as reading and writing files, creating directories, deleting files, etc. In this article, we will introduce you to some common operations and techniques of PHP file processing functions to help developers better process files.
1. File processing function
2. File reading and writing
In PHP, file reading and writing are very common operations. We can use the fopen() function to open a file pointer, then use fread() to read the content from the file, and use fwrite() to write the content to the file.
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Here, We opened a file named test.txt and read the contents of the file using the fread() function. Finally, we close the file using the fclose() function.
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Here, we use the fopen() function to create a file named test .txt file, and use the fwrite() function to write the content to the file. Finally we close the file via fclose().
3. File upload
File upload is also a very common PHP operation. We can use the $_FILES array to get the data from the uploaded file and use the move_uploaded_file() function to move the file to the target directory on the server.
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Here, We can use the print_r() function to print the contents of the uploaded file.
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在Here, we first set the target directory for uploading files and generate a target path $target_file. We then use the move_uploaded_file() function to move the uploaded file into the target directory.
4. Directory processing
In PHP, you can also handle operations such as creating, opening, moving and deleting directories.
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Here, we use the mkdir() function to create a directory named directory_name. If the directory does not exist, create it.
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Here, we have opened a directory using the function opendir(), traversed its contents using the function readdir(), and closed a directory using the function closedir().
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Here, we define a function deleteDirectory(), which uses recursion to delete all subdirectories and files including directories.
Summary
In this article, we introduced some basic operations of PHP file processing functions, including file reading and writing, file uploading and directory processing. Of course, these functions are not only part of PHP's file processing work, they also cover many other aspects of PHP programming. When you use these functions, make sure you understand and master how to manipulate files and directories.
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