Get an object from one function to another

Question

I got a function who gets all the labels out of the database and puts them into an array, but if I take the object to another function it will be NULL

private static $labels='blaat';

public function loadDatabaseLabels(){
    $res=DB::query("SELECT * FROM labels");
    $label_array=array();
    while($row=mysqli_fetch_assoc($res)){
        $label_array[$row['indicator']]=$row['text'];
    }
    $labels = new label();
    $labels->labels=$label_array;
}

public function getLabel($indicator){
    var_dump($labels->label);
}

Pass $labels as an argument to getLabel() else it won't be in scope.... this really is a PHP 101 question - php.net/manual/en/language.variables.scope.php — Mark Baker
– Mark Baker, Commented May 3, 2013 at 19:51

Mirko Adari · Accepted Answer · 2013-05-03 21:40:44Z

2

It seems that this is a code snippet from a PHP class. If you set a variable as $labels it's in the local method scope, is not seen by anything outside the method and gets lost after method finishes.

To set variables on the object instance, use $this->labels = ... and var_dump($this->labels), or as it's declared static, self::$labels, instead.

If that's not the case then forget about static public private keywords. Functions would still not see anything outside of them tho, so you have an ugly option of adding global $labels in front of the methods (karma will get back at you for this) or passing $labels bu reference to both methods as &$labels.

edited May 3, 2013 at 21:40

answered May 3, 2013 at 19:56

Mirko Adari

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2 Comments

Rickert Over a year ago

if i use a this i get this error: Using $this when not in object context in

Jon Over a year ago

declaring a function as public implies that it exists within a class - otherwise you are using static, public, etc incorrectly.

Madbreaks · Accepted Answer · 2013-05-03 20:25:21Z

0

A few issues here. First, $labels is declared private static - this means to access it you would do so using self::$labels:

// set like this:
self::$labels->labels = $labels_array;

public function getLabel($indicator){
    var_dump(self::$labels->label);
}

Secondly, you are not setting self::$lables->label, but self::$labels->labels (note the plural labels). So in the above function, var_dump is accessing something that hasn't been set.

answered May 3, 2013 at 20:25

Madbreaks

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