How to use callback function in codeigniter

Question

I have a array $services and this array contains below values :

Array
(
  [0] => One way
  [1] =>  Hourly
  [2] =>  To Airport
  [3] =>  From Airport
  [4] =>   Birthday
  [5] =>  Wedding
  [6] =>  Concert
  [7] =>   Sporting Event
  [8] =>   Cruise Party
  [9] =>  Funeral
)

You can notice that some of values in array contain space.
To remove this space from array values I created a array_walk function which walk into array and trim the white space.

public function trim_value(&$value) {
     $value = trim($value);
}

As you all know that the syntax of array_walk function is :

array_walk($array, 'callback_function');

Now I want to use this function in codeigniter controller. As I know that a function in controller is being used as $this->function in another function.
So I tried to use callback function as :

array_walk($services, $this->trim_value);

It always throws an below error :

A PHP Error was encountered

<p>Severity: Notice</p>
<p>Message:  Undefined property: Attribute::$trim_value</p>
<p>Filename: controllers/attribute.php</p>
<p>Line Number: 230</p>

So can somebody tell me that how to use callback function in one of controller's function ?

No, I don't agree with you because there are many inbuilt function in php library that are used with callback function. — Ankit
– Ankit, Commented Apr 14, 2015 at 6:00

Saty · Accepted Answer · 2016-06-10 13:15:11Z

9

You have to pass array_walk() an array with $this as a defined variable/pointer.

Try this

array_walk($array, array($this, 'trim_value'));

edited Jun 10, 2016 at 13:15

answered Apr 14, 2015 at 6:09

Saty

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1 Comment

TimBrownlaw Over a year ago

Beat me to it - I just found that in php.net/manual/en/function.array-walk.php and tried it out - It works!

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