PHP: Call an internal (Function) method within the same class

Question

Rather than having multiple lines of the same code on each method, I want to set up a (Boot/initialization) method to define common values and such. Then, call that method when needed.

Initially, I had something like this:

<?php
class boot {
    private static $root = $_SERVER['DOCUMENT_ROOT'] . '/';


    public static function load() {
        return self::$root;
    }
}

$test = boot::load();
echo $test;
?>

But I would get an error saying something like: Parse error: syntax error, unexpected T_VARIABLE in...

So, I changed it to:

<?php /* Class Bootstrap (Boot for short) */
class boot {
    private static $base = null;
    private static $root = null;


    private static function boot(){
        self::$base = $_SERVER['DOCUMENT_ROOT'] . '/';
    }


    public static function load() {
        self::boot();
        return self::$base;
    }
}

$test = boot::load();
echo $test;
?>

Then I got this: Fatal error: Constructor boot::boot() cannot be static in...

So I resorted to:

<?php
class boot {
    private static $base = null;
    private static $root = null;


    private function boot(){
        $this->base = $_SERVER['DOCUMENT_ROOT'] . '/';
    }


    public static function load() {
        $this->boot();
        return self::$base;
    }
}

$test = boot::load();
echo $test;
?>

But I am still geting an error, Fatal error: Using $this when not in object context in... I tried different things but I am out of ideas.

@mark-baker That did not work. could you try it, in an answer? — Omar Juvera
– Omar Juvera, Commented Jan 17, 2014 at 0:21
I really don't get it. If you are using an all-static class, simply initialize static variables once. If you're planning on instanciating your class, put the initializations where they belong, i.e. in the constructor. Or am I missing something? — kuroi neko
– kuroi neko, Commented Jan 17, 2014 at 0:32
@kuroineko 黒い猫, $base is used several times. I am also calling functions like boot:function() . Static functions cannot call a construct. Also, in this example you only see one line, but I have more. adding the same line of code over and over is not productive — Omar Juvera
– Omar Juvera, Commented Jan 17, 2014 at 1:30

Community · Accepted Answer · 2017-05-23 12:29:16Z

3

You cannot use $ this in a static context.

When to use self over $this?

To sum up the above answer you have to use $this To access the members that belong to the current Object (non-static) but use self :: to access the class's static members.

You could make all your functions static and use self :: instead of $this-> .

edited May 23, 2017 at 12:29

CommunityBot

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answered Jan 17, 2014 at 0:08

Patrick Geyer

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Comments

xelber · Accepted Answer · 2014-01-17 00:29:48Z

1

Try the following

class boot {
    private static $base = null;
    private static $root = null;

    public static function load() {
        self::$base = $_SERVER['DOCUMENT_ROOT'] . '/';
        return self::$base;
    }
}

$test = boot::load();
echo $test;

answered Jan 17, 2014 at 0:29

xelber

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1 Comment

Omar Juvera Over a year ago

multiply load() twenty times over, with different functions. It is not what I am looking for. I want to initialize some properties in one blow. not on every function (x 20). Again, this is just one line, but I got lots more

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