常用的数值判断函数_PHP

---

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

---