Problema con funzioni personalizzate mysql

[Tecnologiamiky]

Ho creato le seguenti funzioni

function nome_colonne_tabella($tabella) {
    $query=mysql_query("SELECT * FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_SCHEMA = '$database' AND TABLE_NAME = '$tabella'");
    while($row1=mysql_fetch_array($query)) {
    return $nome=$row1['COLUMN_NAME'];
    }
    }
    
function cont_while($tabella) {
        $query=mysql_query("SELECT * FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_SCHEMA = '$database' AND TABLE_NAME = '$tabella'");
        return $row1=mysql_fetch_array($query);
    } 

che utilizzo qui

while(cont_while('tabella')) {
echo nome_colonne_tabella('tabella');

} 

ma mi viene fuori questo errore

IDIDIDIDIDIDIDIDIDIDIDIDIDIDIDIDIDIDIDIDIDIDIDIDIDIDIDIDIDIDIDIDIDIDIDIDIDIDIDIDID
 Fatal error: Maximum execution time of 30 seconds exceeded in F:\xampp\htdocs\ess_php\class_conndb\class.php on line 40

come mai?