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

The error message "failed to open stream: No such file or directory" in PHP scripts typically occurs when the file being referenced in the code does not exist or the path to the file is incorrect. To solve this issue, double-check the file path and make sure the file actually exists in the specified location. Additionally, ensure that the file has the correct permissions set for the PHP script to access it. 

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

if (file_exists($file_path)) {
    $file = fopen($file_path, 'r');
    // Continue processing the file
    fclose($file);
} else {
    echo "File does not exist.";
}

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