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$qSQL = "SELECT X
               FROM Y
               WHERE Z=Bedingung";
$rSQL = MYSQL_QUERY($qSQL);
if(!@MYSQL_FETCH_RESULT($rSQL, X)) 
  echo "true";
else 
  echo "false";

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$sql =  mysql_query("SELECT X FROM Y WHERE X LIKE 'Z'");
$zahl = mysql_fetch_array($sql);

if(count($zahl) == 2) {
    echo "true";
}
else {
    echo "false";
}

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$q = mysql_query("SELECT count(*) FROM table WHERE x = 'y'");
$r = mysql_result($q,0,0);

if($r == 0){

return FALSE;

}

else {

return TRUE;

}