What do you mean by symbols------and::

After the basic PHP operators, the following again, the PHP novice frequently encountered problems, and, and:: What are these three guys are what the difference is what the AH! look very faint.

Okay, here's a detailed explanation, if you have a c++,perl base, you'll find that these guys and some of their symbolic functions are similar.

The '-> ' symbol is the ' pluggable dereference operator ' (infix dereference operator). In other words, it is a method of calling a subroutine that passes arguments by reference (and, of course, other functions). As we mentioned above, most of the parameters are passed by reference when invoking PHP's functions. The '-and ' features in PHP are the same as they are in Perl or C + +. Here is an example of a simple solution reference:

echo $x->def (); # output

　　

The ' = = ' operator is common in PHP scripts. Because the PHP array functions are very rich, we often use arrays because it is convenient to manipulate the data.
　　$phparr = new Array (in = = ' reply, '

Side = ' Left ',

PADX = 2m,

Pady = 2m,

IPADX = 2m,

Ipady = 1m

)

By the way, if you need to use the number "greater than equals" symbol, you should use ">=" instead of "=".

In PHP "::" This is called the scope resolution operator, aka domain operator

The "::" symbol can be thought of as "." In the C language. Similar, and it is more like C + + (Perl):: Class-scoped operators.

PHP calls the internal static members of a class, or calls between classes using:

Here is an example:
class A
{
static $count = 0;
static function haha ()
{
//
}
function Diaoyoug ()
{
Self::haha ();
Self:: $count;
}
}

A.B.C; /* * in the C language

A::b::c (); Functions in C + +

$a:: b::c; # Scalar in Perl 5

　

What do you mean by symbols------and::