What is the significance of 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 indicates that the file being referenced in the code does not exist in the specified directory. To solve this issue, you should ensure that the file path is correct and that the file actually exists in the directory specified.

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

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