PHP basic Knowledge "functions" (9) Math and object class functions

First, mathematics

ABS--Absolute value

Ceil--into a method to take the whole

Floor--The Rounding method

Fmod--Returns the remainder of the floating-point number for division

Round--Rounding a floating-point number

Sqrt--square root

Pi ()/m_pi--Get PI value

Is_nan--Judging whether it is a legal value

Is_finite--Determining whether a finite value

Is_infinite--Determine if the value is infinite

Max--Find out Max, Max (num1,num2,num3 ...), Max (Array (num1,num2,num3 ...))

Min--Find the minimum value, min (num1,num2,num3 ...), min (Array (num1,num2,num3 ...))

RAND ([int min, int max])--produces a random integer

Mt_rand ([int min, int max])--Generate a better random number

Mt_srand ([int seed])--sowing a better random number generator seed

Srand ([int seed])--Seeding the random number generator

Getrandmax--Displays the maximum possible value of the random number

Mt_getrandmax--Displays the maximum possible value of a random number

Ii. Objects and classes

1 , class of check

class_exists-checking whether a class is defined

method_exists-checking the existence of a class's methods

is_a-returns TRUE if the object belongs to the class or if the class is the parent class of this object

is_subclass_of-returns TRUE If this object is a subclass of the class

2 , get the name of the class

get_class-returns the "first name" of an object or class

Get_parent_class-returns the "parent class name" of an object or class

get_declared_classes-returns an array consisting of the names of the defined "classes"

3 , gets the properties of the type

Get_class_vars (string class_name)-Returns an array of "default Properties" for the class

get_object_vars-returns an associative array consisting of "Object Properties"

4 , get other

Get_class_methods (mixed class_name)-Returns an array consisting of the method name of the class

get_declared_interfaces-returns an array containing all declared "interfaces"

5 , abandoned

call_user_method_array-invokes a user method, passing a parameter array (deprecated)

Call_user_method-invoking a user method on a specific object (deprecated)

The class name and method name can be the same//

PHP basic Knowledge "functions" (9) Math and object class functions