PHP的幾個常用數字判斷函數代碼，主要包括雙精度，整數，字符判斷等。
<HTML>
<HEAD>
<TITLE>常用的數值判斷函數</TITLE>
</HEAD>
<BODY>
<?
//判斷數組
$colors = array("red", "blue", "green");
if(is_array($colors))
{
print("colors is an array"."<br>");
}
//雙精度數判斷
$Temperature = 15.23;
if(is_double($Temperature))
{
print("Temperature is a double"."<br>");
}
//整數判斷
$PageCount = 2234;
if(is_integer($PageCount))
{
print("$PageCount is an integer"."<br>");
}
//對象判斷
class widget
{
var $name;
var $length;
}
$thing = new widget;
if(is_object($thing))
{
print("thing is an object"."<br>");
}
//字符判斷
$Greeting = "Hello";
if(is_string($Greeting))
{
print("Greeting is a string"."<br>");
}
?>
</BODY>
</HTML>
