I am trying to create a php session variable which should reference "language":"ENG" (and more specifically ENG) within the table column params.
Example: Originally I've been using a "userLanguage" column and created my php session variable like this:
$_SESSION['userLanguage'] = $result[0]['userLanguage'];
Since "language":"ENG" is only one part of the field's value ({"admin_style":"","admin_language":"","language":"ENG","editor":"","helpsite":"","timezone":""}), this obv. doesn't work anymore. Is there an easy way to pull ENG from language? Help would be much appreciated.
Simply run a json_decode() on the field value.
$params = json_decode($result[0]['params']);
if(isset($params->language)){
$_SESSION['userLanguage'] = $params->language;
}
Related
I simply want to know how to access array elements retrieved from a database. I have the following code to get the names of each item in my database.
$plat_options = $this->db->get('tblplatform_options')->select('name')->result();
How do I go about accessing the name from the array $plat_options? Typically I would do $plat_options[0] for the first element in C#, how is this done in php/codeigniter?
In PHP/Codeigniter, can be done in the same way:
$plat_options[0] //if you have this element, usually is better to check if exists.
You can retrieve all the elements with foreach($plat_options as $option){...}
You can cast to object: https://www.kathirvel.com/php-convert-or-cast-array-to-object-object-to-array/
Or use a Codeigniter Helper (assuming you are using CI3): http://www.codeigniter.com/user_guide/helpers/array_helper.html
I recomend to know which is your array format and retrieve that way (if you don't know, you can do a: var_dump($plat_options) ) to know if is an associative array.
You can use the result_array() function:
$data = $plat_options->result_array();
echo($data[0]['name']);
or:
$data = array_shift($q->result_array());
echo($data['name']);
I extracted this last part from: Codeigniter $this->db->get(), how do I return values for a specific row? that you could check too.
If you don't know a lof of CI, the best you can do is do a simple tutorial to understand how the data + ActiveRecord works.
Hope it helps!
In my php script,i am using a php variable inside an sql query.The php variable acquires its value through a post variable as follows:
$desc0=$_POST['desc0'];
$desc1=$_POST['desc1'];
$desc2=$_POST['desc2'];
$desc3=$_POST['desc3'];
$desc4=$_POST['desc4'];
$desc5=$_POST['desc5'];
$desc6=$_POST['desc6'];
$desc7=$_POST['desc7'];
$desc8=$_POST['desc8'];
$desc9=$_POST['desc9'];
The query is:
for($i=0;$i<10;$i++)
{
$q="insert into photos(name,category,description) values ('{$name{$i}}','$category','{$desc{$i}}')";
}
The problem is that on submitting the form i am getting an error which says
"undefined variable desc".
Therefore its not taking the values from the previously defined variables?
Any help?
First of, you code is completely unsafe - you should not pass user data directly into your query. There are many topics about it, and this is a good start.
Next, you don't need to store your data in such weird way. What if you'll want to pass 20 photos? In HTML, name your fields like photos[] - and in PHP, your values will be correctly parsed as an array $_POST['photos'], so you will be able to work with array:
$photos = $_POST['photos'];
foreach($photos as $photo)
{
//$photo contains certain item, so handle it with your logic
}
Finally, your issue is because of non-obvious PHP possibility for array-dereference with curly brackets. So your $desc{$i} is an attempt to access $i-th index for non-existent array $desc. Either use $desc$i or use concatenation to separate your variables.
You must change $desc{$i} to ${"desc" . $i}
We always retrieve the value in a $_GET['var'], but is it possible to assign a value as well? I have a php page where at one point, through ajax, I want to stay on the same page but change the query string or do an assignment like this:
$_GET['myvar'] = 'newvalue';
Is this possible?
Yes you can override the $_GET. however that is only for that request.
with ajax you do a new request and in the ajax call you can just use diffrent values for the data.
Yes, you can assign to the $_GET array, but it won't change the query string in the URL.
It's probably not the wisest thing to do though, as it will be overwritten in the next request
$_GET is just like a regular array. The only difference is that the keys of this array will be automatically populated with values that come with the request using HTTP GET. They are called superglobals because they are automatically and globally available anywhere in your script, other wise they behave just like regular arrays.
So if you have a request like mypage.php?key=value, PHP automatically does something equal to this for you:
$_GET['key'] = 'value';
And just like any regular array, you can overwrite it with a different value. However I really do not see a use case for that unless you are doing some testing or some really weird thingy..
I'm getting a few rows from the DB with an ajax call in PHP and I save the result to an array with javascript.
Then I make some changes in the data and wish to update the DB.
So I use another ajax call for that but I can't manage to access the fields inside the rows correctly.
When I try this I get nothing:
echo $bArray[$i].branchId;
When I try this:
echo json_encode($bArray[$i].branchId);
I get ArraybranchId instead of the field value.
What's the correct way to access the field with php?
Try either for array:
$bArray[$i]['branchId']
or for object:
$bArray[$i]->branchId
depending which type $bArray[$i] is (array or object). You have not written in your question, so I showed both ways.
I take it branchId is the name of the field, and you want the value for that field?
If so, it's:
echo $bArray['branchId']; or
echo $bArray[$i]['branchId']
Edit: Also, you'll need to make sure you're using mysql_fetch_assoc not mysql_fetch_array!
Can you read out the name of a PHP constant from a database and use it inside of a php variable, to display the value of the constant for use in a menu?
For example here's what I'm trying to accomplish
In SQL: select menu_name AS php_CONSTANT where menu_id=1 the value returned would be L_HOME which is the name of a CONSTANT in a php config page. The php config page looks like this define('L_HOME','Home'); and gets loaded before the database call.
The php usage would be $db_returned_constant which has a value of L_HOME that came from the db call, then I would place this into a string such as $string = '<ul><li>' . $db_returned_constant . '</li></ul>' and thus return a string that looks like $string = '<ul><li>Home</li></ul>'.
To sum up what I'm trying to do
Load a config file based on the language preference
query the db to return the menu name, which is the name of a CONSTANT in the config file loaded in step one, and also retrieve the menu_link which is used in the "onclick" event.
Use a php variable to hold the name of the CONSTANT
Place the variable into a string that gets echo'd out to create the menu displaying the value of the CONSTANT.
I hope this makes enough sense...is it even possible to use a constant like this?
Thanks.
define('L_HOME','Home');
$db_returned_constant = 'L_HOME'; // value actually retrieved from db
echo constant($db_returned_constant);
// will output 'Home'
Sure, just retrieve the name of a constant into a string and then use constant.