Fatal error</b>: Call to undefined function [closed]

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if i have this structure:

function one () {
    if (4>3) {
        return true;
    }
    else
    return false;
}

function two () {
    if (one()) {
        echo ("ok");
    }
    else
    echo("first function have a problem");
}

this works without any problem.

but now, if i have:

class all {
    function one () {
        if (4>3) {
            return true;
        }
        else
        return false;
    }

    public function two ()开发者_开发百科 {
        if (one()) {
            echo ("ok");
        }
        else
        echo("first function have a problem");
    }
}

$val = new all();
$val -> two ();

i receive: Fatal error: Call to undefined function one (); Why?

thanks

---

In PHP, you must explicitly say that you are calling an object's method. In some languages it is implicit; in PHP it is not.

You need to use $this:

        if ($this->one()) {

See the manual. As other answers have said, if you omit $this the function call is treated as a call to a global function.

---

There, won't complain anymore about fatal errrzz:

class all {
    function one () {
        if (4>3) {
            return true;
        }
        else
        return false;
    }

    public function two () {
        if ($this->one()) {
            echo ("ok");
        }
        else
        echo("first function have a problem");
    }
}

$val = new all();
$val->two();