What are common reasons for the error message "Failed to open stream: No such file or directory" in PHP?

The error message "Failed to open stream: No such file or directory" in PHP typically occurs when the file specified in the code cannot be found or does not exist in the specified directory. To solve this issue, you should double-check the file path and ensure that the file exists in the correct directory.

$file = 'path/to/file.txt';

if (file_exists($file)) {
    $handle = fopen($file, 'r');
    // Rest of the code to read the file
} else {
    echo "File does not exist.";
}