Farei cosi.
Codice PHP:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>Untitled</title>
<script language="JavaScript" type="text/javascript">
<!--
function trovaNumeroVicino(valore){
my_array = [5,10,12,15,18,22,27,33,39,47,56,68,82,100,120,150,180,220,270,330,390,470,560,680,820,1000,1200,1500,1800,2200,2700];
min_diff = 9999999999999;
risultato = 0;
for(i=0;i<my_array.length;i++) {
diff = Math.abs(my_array[i] - valore);
if (diff < min_diff) {
min_diff = diff;
risultato = my_array[i];
}
}
return risultato;
} // function trovaNumeroVicino(valore)
//-->
</script>
</head>
<body>
<script language="JavaScript" type="text/javascript">
<!--
alert(trovaNumeroVicino(87));
alert(trovaNumeroVicino(750));
//-->
</script>
</body>
</html>
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