A variable in PHP that reads another function from the same class

In the same class, how do you invoke a variable value from function B in function a?

Reply to discussion (solution)

No way!
Please read carefully the description of the scope of variables in the manual

It can be set as a global variable when the variable in B is defined, or you can return the value to a in other ways.

In the same class, to implement a variable that can only be used as a property of this class.

In the same class, to implement a variable that can only be used as a property of this class.

So what if I use the value of B in a?

No, scope is limited.

If you want to read it, you can set it as a global variable for the class.

The $c class declares an attribute in Method 1 and $this->c=a; Method 2 uses $this->c directly. Be sure to call Method 1 before you can assign a value

No, scope is limited.

If you want to read it, you can set it as a global variable for the class.

I set it to public $a at the beginning of the class; Is that OK?

The $c class declares an attribute in Method 1 and $this->c=a; Method 2 uses $this->c directly. Be sure to call Method 1 before you can assign a value

What does it declare? I declare it as public $a; Then method 1 assigns the value you say, and then method 2 cannot read it.

Class T {public  $v;  function B () {    $this->v = 123;  }  function A () {    echo $this->v;  }} $p = new T; $p->b (); $p->a (); 123

Class T {public  $v;  function B () {    $this->v = 123;  }  function A () {    echo $this->v;  }} $p = new T; $p->b (); $p->a (); 123

If I write this

Class T{public  $p; function a{$this->p=1;} function B{echo $this->p;}}

And then I'm going to read function A and then read function B after the page comes in?

Class T {public  $v;  function B () {    $this->v = 123;  }  function A () {    echo $this->v;  }} $p = new T; $p->b (); $p->a (); 123

If I write this

Class T{public  $p; function a{$this->p=1;} function B{echo $this->p;}}

And then I'm going to read function A and then read function B after the page comes in?

This is not the same as the above, the first assignment, then read

What do you think is going to happen?
If first A and B, how to be reflected in function A, call function B in the value of a variable to use

Class T {  function B () {    return 123;  }  function A () {    echo $this->b ();  }} $p = new T; $p->b (); $p->a (); 123

But that's not the value in the call B.

So, your basic starting point is a problem.

Class T {public  $v;  function B () {    $this->v = 123;  }  function A () {    echo $this->v;  }} $p = new T; $p->b (); $p->a (); 123

If I write this

Class T{public  $p; function a{$this->p=1;} function B{echo $this->p;}}

And then I'm going to read function A and then read function B after the page comes in?

This is not the same as the above, the first assignment, then read

Just tried this and then didn't know how to read a null value.

Class T {  function B () {    return 123;  }  function A () {    echo $this->b ();  }} $p = new T; $p->b (); $p->a (); 123

But that's not the value in the call B.

So, your basic starting point is a problem.

Class T{public  $p; function a{$this->p=1;} function B{echo $this->p;}}

I write this, in fact, I want to implement the business logic is that the page came in, asynchronous read a method, and then I in the B method also need a method in the value, I do not know I write this, can not achieve I in the B method to get the value of a method

Do a and B not be in the same HTTP session?
Then it's wrong of you to write like this!
Need to use other vectors to achieve

Do a and B not be in the same HTTP session?
Then it's wrong of you to write like this!
Need to use other vectors to achieve

Is that my page comes in is a method, and then asynchronously with the B method, so that is 2 different reply, the variables can not be used to each other, right?

Right! The data cannot be shared between different sessions.
So you need cookies, sessions, databases, files, and third-party support software.

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