If i have 3 checkboxes that you can check for the transport available: Taxi, Train, Bus.. how should i pass them in a nice way? Cant you like pass a array with Transport = bus, train (those you checked), or maybe you have to send them seperatly one variable at a time, because it is inside a form (and already are a array all of it)?
I assume you are talking about sending the data from the client to the server. If so, you can give the checkboxes the same name:
<input type="checkbox" name="transport[]" value="Taxi"> Taxi <br />
<input type="checkbox" name="transport[]" value="Train"> Train <br />
<input type="checkbox" name="transport[]" value="Bus"> Bus <br />
When you sent the form, the data will be available as array in $_POST['transport'] (or $_GET, depending on which methods you use). The [] in the input field name will make PHP parse the data as array.
More information in Variables From External Sources.
Some more explanation:
Without the brackets (i.e. []), the resulting query string would look like this (assuming Taxi and Train are selected):
transport=Taxi&transport=Train
PHP, in contrast to other languages, will only consider the last value for the same key. In order to make PHP treat values with the same key as array, you have to append [] to the name.
All input fields will be passed as part of your $_POST or $_GET arrays, based on the method type of your form submission. Checkboxes are passed as name=on or name= whether the checkboxes are selected or not. Depending on how you're processing the submitted form data there are different ways to work with the values. I hope this helps?
If you use something like this:
<input type="checkbox" name="transport[]" value="bus" />
<input type="checkbox" name="transport[]" value="train" />
<input type="checkbox" name="transport[]" value="taxi" />
The values will be passed as an array accessible with $_POST['transport']. If the user checks the first and the last checkboxes $_POST['transport'] will contain two strings: 0 => "bus", 1 => "taxi".
Also see http://jetlogs.org/2007/07/19/passing-input-arrays-in-php/.
Related
When creating forms one can use the PHP [] array syntax to have multiple form fields populate an array when the input is parsed in PHP, like this:-
<input type="text" name="myArray[]">
<input type="text" name="myArray[]">
What would you call these kind of fields? Array input fields, maybe?
Aside: the PHP docs for this type of form input can be found here
It just like a normal input form. But value to send is multiple value, therefore it just set like array type
i've just noticed that if i have a lots of input fields with unique names on my form, sometimes the data does not get passed to the php page that is processing it. however, if instead of naming each field like this:
<input type="text" name="userid-1121" value="1">
<input type="text" name="userid-1122" value="1">
if i build the names into an array like this:
<input type="text" name="userid[1121]" value="1">
<input type="text" name="userid[1122]" value="1">
the array method doesnt seem to loose any posted data.
Just wondering if this is normal and if my solution of using the array method is better?
thanks
If you have a lot of input with different names, every input is part of the superglobal variables $_GET or $_POST and it's affected by the directive: max_input_vars, so your solution of using an array is valid because you are limiting the number of different variables. Other solution is to increase the value of this directive in your php.ini
There is no better way, just easier.
If you use the array method, it will be more easier to read / pass the data later on.
Apart from that, they are both the same.
Okay so my title might be a little confusing, but let me explain my situation:
I have a pretty big form with lots of fields, some which are required, some which are not. I do validation with JS, but then I'm also doing validation on the server side with PHP.
One of the things I'm asking the user for is a "Header Name". Now, header name has the name attribute of "header1". The user has the option of adding more header fields on the form. So if they click a button it adds another "Header Name X" with name attribute "headerx".
Got it? Now, the problem is, in general these header fields are not required, but I do have the condition that they MUST supply at least one Header field. So they could supply 100, they could supply 2, they might supply 1, but if they don't supply any then validation should fail.
I can't think of a good way of checking for this in PHP though. I know your fist thought is just check if $_POST contains anything. Won't work though because they are multiple other fields in this form that are required that have nothing to do with these Headers. So I can't just simply check to see if $_POST contains something because it always will.
Is there a way I can like combine isset() with a regular expression? Like isset($_POST['header{\d+}']. Which would be saying like header with atleast one digit following it.
Thanks for the help!
EDIT: Oh and if this wasn't hard enough already, the amount of Header Fields is limitless. So I can't just loop through all the possible "headerx" because that would obviously be an infinite loop.
You could have field names with []:
<input type="text" name="foo[]" value="x" />
<input type="text" name="foo[]" value="y" />
Then $_POST would be like:
array('foo' => array('x', 'y'));
You could even have associative arrays:
<input type="text" name="foo[bar][first]" value="x" />
<input type="text" name="foo[bar][second]" value="y" />
Would look like:
array('foo' => array('bar' => array('first' => 'x', 'second' => 'y')))
You can loop through the elements like this:
$i = 1;
while($row = $_POST['header' . $i++]){
//do stuff
}
this will keep going until there are no more sequential elements.
Why not simply look at it this way: In your JS on the other end, when you are doing validation, have the last check a check to verify that a header is sent - and it it passes, set a hidden field in the form to a true value - then in your PHP you can check that particular element without having to worry about every possible header that is sent.
if(!count(preg_grep('#^header\d+$#',array_keys($_POST))))
{
//no header submitted
}
This will allow to use a RegExp as requested, but I also would prefer the solution by jpic
Lets say I have something like this:
http://gyazo.com/642987562175afc6d11a962762327744.png?1329570534
Basically, the user fills out this form, and if there are more people, pressing tab on the last form will add another input. I believe Quizlet does something similar.
How would I parse all these inputs with PHP? I obviously don't know how many inputs there will be.
Cheers
Just create every (similar) element of the form (in html) as an entry of an array (in php). See http://php.net/faq.html.php#faq.html.arrays
You can just iterate over the elements then
foreach ($_POST['MyArray'] as $element) { echo $element; }
Just to make it complete: If you click on the link above then you see, how your form elements should look like.
<input name="MyArray[]" />
<input name="MyArray[]" />
<input name="MyArray[]" />
<input name="MyArray[]" />
Make sure each input has a unique name by incrementing it for each additional field, eg:
<input type="text" name="field-1" />
<input type="text" name="field-2" />
<input type="text" name="field-3" />
Then when you submit it to your php script you have access to all form fields in the $_GET or $_POST arrays, depending on your form submission method.
You can do a simple while loop to iterate over $_GET['field-1'], $_GET['field-2'], $_GET['field-n'].
Make sense?
Variable-length argument lists
PHP has support for variable-length argument lists in user-defined functions. This is really quite easy, using the func_num_args(), func_get_arg(), and func_get_args() functions.
No special syntax is required, and argument lists may still be explicitly provided with function definitions and will behave as normal.
http://php.net/manual/en/functions.arguments.php :)
I've got a single checkbox which i'd like the unchecked value to be 0 and the checked value to be 1, but when the post goes through, it always shows as 1 whether the box is checked or not..
Here's the checkbox:
<input name="stock[]" type="checkbox" id="stock[]"> value="1" />
here's what it spits out regardless of whether it's checked or not.. (there are multiple "stock" checkboxes..
[stock] => Array
(
[0] => 1
[1] => 1
[2] => 1
[3] => 1
[4] => 1
[5] => 1
)
I can't seem to get it working.. :S Any ideas? :)
It seems like you have a extra > in your Checkbox HTML. Value is not used in case of checkboxes.
<input name="stock[]" type="checkbox" />
because you have value="1", the form will always submit the value regardless of whether checked or not. So remove the value attribute will help.
And to preset the checkbox to be checked, use the checked attribute instead. Example:
<input name="stock[]" type="checkbox" checked="checked" />
(Obviously, you need to start by removing that extraneous > sign.)
Checkboxes and radio buttons must have a value attribute. If they're checked, that value is sent when the form is submitted; if they're not checked, no value is submitted. Thus, you can't directly do the "0 if unchecked, 1 if checked" thing. What you can do instead is use the value attribute to detect which checkboxes were checked.
<input type="checkbox" name="stock[]" value="1" id="stock1" />
<input type="checkbox" name="stock[]" value="2" id="stock2" />
<input type="checkbox" name="stock[]" value="3" id="stock3" />
If the 1st and 3rd boxes are checked, but the 2nd is not, then when you look at the value of the stock[] array in your code, you'll find that it contains 1 and 3, but not 2.
Edit: I just confirmed that the reason it looked like all of your checkboxes had values submitted was that you failed to give the form any way to differentiate among them. If you have multiple checkboxes with not only the same name but the same value, then your form results will look something like "stock[] = 1, stock[] = 1, stock[] = 1". PHP will then interpret this as stock[1] = 1, stock[2] = 1, etc., but the point is that stock[2] might actually be the fourth checkbox - neither the form nor php has any way to tell where each value came from.
So bottomline is, you can either use the same name for a series of checkboxes, OR you can use the same value, but not both at once: if you use the same name, you have to use the value to differentiate among the controls; and vice versa, if you want to use the same value, you need to use different names.
By the way, if you don't specify the value of a checkbox, then most browsers will supply a default value of their own - for example, IE and Firefox use "on" (or "ON" in some versions). But depending on such defaults is always a bad idea.
I'm not sure you can/should name an input element "stock[]" - try getting rid of the [] and re-test.