021-PHP常用的数值类型判断函数

<?php

    //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>");

    }

?>