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I have to search if a php file has variables

i have to search if a php file has variables but i am encountering some errors could you help me out?

<?php
$file_da_gestire = "lettere.php";
$file=fopen($file_da_gestire, "r");
    if(false===$file){
        printf('Impossibile aprire il file %s', $file);
        exit;
    }
    while(!feof($file)){
        $trovata=false;
        while($trovata!==true){
            $carattere=fgetc($file);
            if($carattere=="$"){
                while(ord($carattere)>64 && ord($carattere)<91 || ord($carattere)>96 && ord($carattere)<123){
                    $carattere=fgetc($file);
                    $variabili.=$carattere;
                }
                $trovata=true;
            }
            continue;
        }
        echo $variabili;
        echo "Nessuna variabile trovata";
    }

?>


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