<?php
//First, declare the file we wish to open.
$file = "test.txt";
//Now, we use the file_exists() function to confirm its existence.
if (file_exists ($file)){
    //Then we attempt to open the file, in this case for reading.
    try {
        if ($readfile == fopen ($file, "r")){
            //Then we can work with the file.
            echo "File opened successfully.";
        } else {
            //If it fails, we throw an exception.
            throw new exception ("Sorry, the file could not be opened.");
        }
    } catch (exception $e) {
        echo $e->getmessage();
    }
} else {
    echo "File does not exist.";
}
?>

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