Usar finally para ejecutar código de forma diferida: http://www.kroatoan.es/articulos/ejecucion-diferida-php-usando-finally/

exec-defer-finally.php

<?php

$handle = fopen($location, 'r+');

if ($handle === false) {  
    return false;
}

try {
    $firstLine = fgets($handle, 1024);

    if ( ! $firstLine) {  
       return false;
    }
    
    //Do Something with firstline of file
} finally {
    fclose($handle);
}


return $firstLine;