me da error
Undefined index: frase in C:\wamp\www\compra\buscar.php on line 3
<h1><a href="<?php echo $_SERVER['PHP_SELF']; ?>”>Buscador - By RogerTM</a></h1>
<form name=”buscar” action=”<?php $_SERVER['PHP_SELF'] ?>” method=”get”>
Buscar: <input type=”text” size=”50″ value=”<?php echo $_GET['frase']; ?>” name=”frase” />
<input type=”submit” name=”buscar” value=”Buscar” />
</form>