Several common number judgment function codes in PHP_PHP tutorial

//Judgment array
$colors = array("red", "blue" , "green");
if(is_array($colors))
{
print("colors is an array"."
");
}
// Double precision number judgment
$Temperature = 15.23;
if(is_double($Temperature))
{
print("Temperature is a double"."
");
}
//Integer judgment
$PageCount = 2234;
if(is_integer($PageCount))
{
print("$PageCount is an integer"."
" );
}
//Object judgment
class widget
{
var $name;
var $length;
}
$thing = new widget;
if(is_object($thing))
{
print("thing is an object"."
");
}
//Character judgment
$Greeting = "Hello";
if(is_string($Greeting))
{
print("Greeting is a string"."
");
}
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