PHP数字判断函数

 
 
<title>常用的数值判断函数</title> 
 
 
 
//判断数组 
$colors = array("red", "blue", "green"); 
if(is_array($colors)) 
{ 
print("colors is an array"."<br>"); 
} 
//双精度数判断 
$Temperature = 15.23; 
if(is_double($Temperature)) 
{ 
print("Temperature is a double"."<br>"); 
} 
//整数判断 
$PageCount = 2234; 
if(is_integer($PageCount)) 
{ 
print("$PageCount is an integer"."<br>"); 
} 
//对象判断 
class widget 
{ 
var $name; 
var $length; 
} 
$thing = new widget; 
if(is_object($thing)) 
{ 
print("thing is an object"."<br>"); 
} 
//字符判断 
$Greeting = "Hello"; 
if(is_string($Greeting)) 
{ 
print("Greeting is a string"."<br>"); 
} 
?>