Comparison between PHP operators and operators in other languages

The ‘- >’ symbol is the “infix dereference operator”.

In other words, it is a method of calling a subroutine that passes parameters by reference (of course, there are other functions).

As we mentioned above, when calling PHP functions, most parameters are passed by reference.

The '->' functions in PHP are the same as they are in Perl or C++. The following is a simple dereference example:

Echo $x->def(); # Output

The '=>' operator is very common in PHP scripts. Because PHP array functions are rich, we often use arrays because they are very convenient for manipulating data.
　$phparr= new array( in => 'reply,'side => 'left',padx => 2m,pady => 2m,ipadx => 2m,ipady => 1m)

By the way, if you need to use a numerical "greater than or equal to" symbol, you should use ">=" instead of "=>".

In PHP, "::" is called the range parsing operator, also known as the domain operator

The "::" symbol can be considered It is similar to "." in C language, and it is more like the :: class range operator in C++ (Perl).

#Qp Call the internal static members of the class, or call between classes::

This is an example:

   class A
   {
       static $count = 0;
        static function haha()
       {
           //
        }  
       function diaoyoug()
     {
          self::haha();
        self::$count;
       }
   }
　　a.b.c; /* C语言中的 */
　　a::b::c(); // C++ 中的函数
　　$a::b::c; # Perl 5中的标量

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