How to Write to Files

<?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.
            //Get the current value of our counter by using fread().
            $curvalue = fread ($readfile,filesize($file));
            //Increment our counter by 1.
            $curvalue++;
            //Then attempt to open our file for writing, again validating.
            if (is_writable ($file)){
                try {
                    if ($writefile = fopen ($file, "w")){
                        //Then write the new value to the file.
                        fwrite ($writefile, $curvalue);
                        echo "Wrote $curvalue to file.";
                    } else {
                        throw new exception ("Sorry, the file could not be opened");
                    }
                } catch (exception $e){
                    echo $e->getmessage();
                }
            } else {
                echo "File could not be opened for writing";
            }
        } 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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