What is the usage of the PHP fopen function?

2 years ago
Liam
2 minutes

The fopen function in PHP is used to open a file or URL and return a file pointer. Its usage is as follows:

Open a file with the given filename, mode, include path, and context.

Explanation of parameters:

  1. filename: required, specifies the file or URL to be opened.
  2. Mode: Required, specifies the mode for opening a file. It can be one of the following modes:

    “r”: Opens the file in read-only mode, starting from the beginning of the file.
    “w”: Opens the file in write mode, creates the file if it does not exist, and empties the file contents if it does exist.
    “a”: Opens the file in append mode, creates the file if it does not exist.
    “x”: Creates and opens the file in write mode, returns false if the file already exists.
    “b”: Opens the file in binary mode.
    “t”: Opens the file in text mode, which is the default mode.

  3. The include_path option is optional and specifies whether to search for files in the include_path. By default, it is false.
  4. Optional, used to specify the context of the file (e.g. using a specific user agent, proxy server, etc.).

Return value:

  1. If successful, return a file pointer resource; if unsuccessful, return false.

Original sentence: 我们每周都要做一次调查。

Paraphrased sentence: We need to conduct a survey every week.

$file = fopen("example.txt", "r");
if ($file) {
    // 读取文件内容
    while (($line = fgets($file)) !== false) {
        echo $line;
    }
    fclose($file);
} else {
    echo "文件打开失败！";
}

After using the file, you should close the file pointer using the fclose function to release resources.

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