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I am really new to Codeigniter, and just learning from scratch. I use CI3.

in native PHP I have a function like this ( to calculate the number of days between two dates) :

function dateDiff($date1, $date2){ $d1 = date_create($date1); $d2 = date_create($date2); $diff = date_diff($d1,$d2); $result = $diff->format("%a"); return $result; }

I have read the manual of CI3 & tried but no success.

this is my trial code

defined('BASEPATH') OR exit('No direct script access allowed'); class DateDiff { public $date1 = ''; public $date2 = ''; public function __construct($params) { $d1 = date_create($this->date1); $d2 = date_create($this->date2); $diff = date_diff($d1,$d2); $result = $diff->format("%a"); return $result; } }

then I call it in other controller, like this :

$NumberOfDays = $this->load->library('datediff', ['2025-01-01','2025-02-02']); echo $NumberOfDays;

Got error.

how to create such a function in CI3 custom library so I can call it in every controller

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  • Include the error message please. Commented Sep 3 at 8:36
  • Can you elaborate on what the error was? Commented Sep 3 at 10:21

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Since it's a loose function, I would put it in a helper file. Each helper file is simply a collection of functions in a particular category. See the documentation here: https://codeigniter.com/userguide3/general/helpers.html

You could create a standalone helper file, but since it's a date function and CodeIgniter already has a date_helper.php file, I would "extend" their date_helper with your custom function.

Create your own MY_date_helper.php file in /application/helpers/, this "extends" the CodeIgniter date_helper.php file that is in /system/helpers/. Then add your function to the MY_date_helper.php file:

<?php defined('BASEPATH') or exit('No direct script access allowed'); if (! function_exists('dateDiff')) { function dateDiff($date1, $date2) { $d1 = date_create($date1); $d2 = date_create($date2); $diff = date_diff($d1, $d2); $result = $diff->format("%a"); return $result; } }

You can then use it in your controller like you would any other helper:

$this->load->helper('date'); $NumberOfDays = dateDiff('2025-01-01','2025-02-02'); echo $NumberOfDays;
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1 Comment

I agree with @Marleen, but in general if you want to create your own library, you can see the documentation codeigniter.com/userguide3/general/creating_libraries.html

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