Common functions for PHP file operations

PHP is a widely used open source programming language that is widely used in the field of web development. In web development, file operation is an essential part, so it is very important to be proficient in PHP's file operation functions. In this article, we will introduce some functions commonly used in PHP file operations.

1. fopen()

fopen() function is used to open a file or URL and returns the file pointer. It has two parameters: file name and opening method. The open mode can be "r" (read-only mode), "w" (write mode), "a" (append mode), "x" (create a new file and write data), etc. Example:

$fp = fopen("example.txt", "r");

2. fread()

fread() function is used to read the file content. It takes two parameters: file pointer and read length (optional, default reads the entire file). Example:

$content = fread($fp, filesize("example.txt"));

3. fwrite()

The fwrite() function is used to write data to a file. It takes two parameters: the file pointer and the data to be written. Example:

$fp = fopen("example.txt", "w");
fwrite($fp, "Hello World!");

4. fclose()

The fclose() function is used to close the file. It has one parameter: the file pointer. Example:

fclose($fp);

5. file_get_contents()

The file_get_contents() function is used to read the entire file content. It has one parameter: filename. Example:

$content = file_get_contents("example.txt");

6. file_put_contents()

The file_put_contents() function is used to write data to a file. It takes two parameters: the file name and the data to be written. Example:

file_put_contents("example.txt", "Hello World!");

7. copy()

The copy() function is used to copy files. It takes two parameters: source file and target file. Example:

copy("example.txt", "example_copy.txt");

8. rename()

The rename() function is used to rename files or move file locations. It takes two parameters: original file name and destination file name. Example:

rename("example.txt", "example_new.txt");

9. file_exists()

The file_exists() function is used to determine whether the file exists. It has one parameter: filename. Example:

if (file_exists("example.txt")) {
  // do something
}

10. unlink()

The unlink() function is used to delete files. It has one parameter: filename. Example:

unlink("example.txt");

These are ten functions commonly used in PHP file operations. Mastering these functions can make it easier for you to read, write, copy, rename, etc. files, thereby improving the efficiency of web development.

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