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+--- Thread: Creating and using a library (/showthread.php?tid=60770)
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Creating and using a library - El Forum - 06-24-2014
[eluser]dwlamb[/eluser]
For the first time, I am constructing a library for some functions that need to be accessed by more than one controller.
After reading 'Passing Parameters When Initializing Your Class' in the documentation I am unsure if I need to set-up initializing to accept parameters or if the function will accept a variable I pass to it when it is called from a controller.
For instance, I have these lines in a controller:
Code:
function edit_content {
...code...
$data['url_block'] = $this->urls($result);
...code...
}
function urls($result){
...code...
return $output;
}With moving the function urls to a library, would the syntax in the controller become?:
Code:
function edit_content {
...code...
$data['url_block'] = $this->Urls_library->urls($result);
...code...
}From reading the documentation, this is what I have for defining my library:
Code:
file named Urls_library.php
<<<Start of file>>>>>
<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
class Urls_library {
public function make_urls($result)
{
if (count($result) > 0){
...code
return $output;
} else {
return;
}
}
}Creating and using a library - El Forum - 06-24-2014
[eluser]treenef[/eluser]
Looks OK to me, have you tried testing it?
Creating and using a library - El Forum - 06-24-2014
[eluser]dwlamb[/eluser]
It did not work. :roll:
I am loading the library through the controller with:
Code:
$this->load->library('urls_library');I have tried with the index function and at the beginning of the function that makes a call for a function in the library.
This is the error message:
Code:
A PHP Error was encountered
Severity: Notice
Message: Undefined property: User::$Urls_library
Filename: controllers/user.php
Line Number: 174Creating and using a library - El Forum - 06-24-2014
[eluser]treenef[/eluser]
Post your user library code, and controller code specifically line 174.
Creating and using a library - El Forum - 06-24-2014
[eluser]dwlamb[/eluser]
I have tried to call the library using function index() of the controller user.php
Code:
function index() {
$this->load->library('urls_library');
if ($this->session->userdata('logged_in')) {
redirect(...code...);
} else {
$this->load->view(...code...);
}//if
}//index...and at the start of the function which makes a call to the library on line 174
Code:
function edit_content() {
if ($this->session->userdata('logged_in')){
$this->load->library('urls_library');
...code...
$urls_data = $this->Model_user->populate_urls($id,$this->session->userdata('user_id'));
$data['url_pit'] = $this->Urls_library->make_urls($urls_data); //this is the syntax on line 174
$this->load->view('view.php', $data);
} else {
redirect ("user/login");
} //if...else
}//edit_recipeThis is the content of Urls_library.php. It is saved to application/libraries/. I checked permissions. They are 666.
Code:
<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
class Urls_library {
public function make_urls($result)
{
if (count($result) > 0){
$output = "<ul class=\"url_list\">\n";
foreach( $result as $key ){
$output .= "<li>".form_hidden('id', $key['id'])."<a >"
.$key['link_text']."</a>\n";
$output .= "</li>\n";
}
$output .="</ul>\n";
return $output;
} else {
return;
}
}
}
/* End of file Urls_library.php */I am really stumped.
Creating and using a library - El Forum - 06-24-2014
[eluser]rm_beginner[/eluser]
i am very new in code_igniter try to add this for you to get all CI core instances.
$CI =& get_instance();
$CI->load->library('urls_library');
http://ellislab.com/codeigniter/user-guide/general/creating_libraries.html
Creating and using a library - El Forum - 06-25-2014
[eluser]treenef[/eluser]
$data['url_pit'] = $this->Urls_library->make_urls($urls_data); //
Make sure the call to the library is all lower case on this line:
$data['url_pit'] = $this->urls_library->make_urls($urls_data); //
Creating and using a library - El Forum - 06-25-2014
[eluser]dwlamb[/eluser]
I do not understand why this would make a difference but modifying all of the names to remove underscores (_) fixed the problem. Not simply function names but the class name and the library file.
No more error messages emanating from line 174.
New rule: No underscores in function names or library class name when creating a library.
Creating and using a library - El Forum - 06-25-2014
[eluser]CroNiX[/eluser]
Strange, my custom libraries use underscores in the filename, class name and function names with no problems. I think treenef had the right solution in his last post. You were capitalizing when it should be all lowercase. Did you try it the way he suggested?
Creating and using a library - El Forum - 06-25-2014
[eluser]treenef[/eluser]
Yes... removing the underscores was just a coincidence as you probably removed the capitals as well at the same time, thereby prompting you to conclude that the underscores was a problem.
It is not this. It was the fact that you had a capital 'U' when you called the library from your controller.
Read the documentation for further clarification.
I know there are some issues with names being capitalized depending on what OS you are using either linux or windows. If in doubt refer to the documentation.