I have a form which ultimately I would like to calculate a percentage score from the values submitted.
The issue I have is that some answers may be marked as n/a, so I need to be able to calculate only the total number of fields with data ( 0 for a fail, 1 for a pass). I have used an empty string for n/a answers as in the code below. I'm new to php, so was wondering what the best way to go about this is. Is there a way to count the number of empty strings submitted, or perhaps count only the total number of strings submitted which contain data?
<label>
<input type="radio" name="item1" value="">N/A
</label>
<label>
<input type="radio" name="item1" value="0">Fail
</label>
<label>
<input type="radio" name="item1" value="1">Pass
</label>
To answer your question in general, you can filter your array, removing the empty strings and then counting the number of items. If you compare that to the number of items in the original array, you know how many empty strings there were. And you can do that for any value you want to measure.
$filtered = array_filter($original, function($el) {
// check for empty strings as 0 for example is a valid value
return $el !== '';
});
var_dump(count($original) - count($filtered));
However, for forms you would have to see if you can use this as I would normally validate the individual fields.
sure - when the form is submitted you can process the $_POST array - in this example using array_filter with a custom callback.
function countempty($value){
/*return empty( $value );*/
return $value=='';
}
$empty=count( array_filter( $_POST, 'countempty' ) );
echo 'Empty: '.$empty;
Related
I am pushing ids to an array but there might be only one single id too, I then need to send this value to an input text:
<input class="form-control" type="text" id="portfolioTitle" value="<?php echo implode(", ", $ids); ?>">
The problem is that if I only have 1 single id, I get this as value:
<input class="form-control" type="text" id="portfolioTitle" value=", 128545">
How can I remove the comma if I only have a single value, like the following?
<input class="form-control" type="text" id="portfolioTitle" value="128545">
Though of doing a foreach for the array before to echo the values but I am wondering if there is a better way.
Using implode() on your array as you're doing now is the correct way to display it as a string. The output you're seeing suggests you might have an empty element in your array which is where filtering comes in.
<?php echo implode(', ', array_filter($ids)); ?>
array_filter() is going to remove any elements from your array that are equal to false. This will strip out your blank elements leaving you wish just the values you need.
Well I am Stuck some where here in Array conversion:
My Controller:
$username = $this->input->post('FirstName');
$countryval= $this->input->post('country');
var_dump($countryval);
My View:
<input type="text" name="FirstName" id="Name" >
<?php
foreach ($countryDetails as $row )
{
echo '<input id="country" type="checkbox" name="country[]" class="unique" value="'.$row->country_id.'">'.$row->country_name.'<br/>';
}
?>
<script>
$('input.unique').click(function() {
$('input.unique:checked').not(this).removeAttr('checked');
});
</script>
I am getting the value from checkbox in an array and I need to pass that value as a string further.
I am not able to convert value from array to string i.e if I var_dump($countryval) I get value in array ! Please Help. Thank you
That is because you have used "country[]" as the name in input field
Please try this incase you need a single value to be returned (Edit made here coz I put type="checkbox" instead of "radio".. I have corrected it) Trust radios for single values.
echo '<input id="country" type="radio" name="country" class="unique" value="'.$row->country_id.'">'.$row->country_name.'<br/>';
hope that helps
You need "country[ ]" as name only if it has multiple values. Eg., For a multiple select
<select name="country[]" multiple>
<option></option> <!-- Your options go here-->
</select>
You can use input-checkbox too.. But with your question, I believe you need just a single value to be returned.
Ok.. Now From Your comments I kind of get what you want. Here is my suggestion
1) When you are having multiple checkboxes with the same name, the values are sent as an array.
2) If you would need a single value at a time and definitely need a checkbox, You can make a radio look like a checkbox like this.
3) If you really want to proceed with your javascript allowing only one checkbox at a time, you can do this.
// Load the 'array' helper
$this->load->helper('array');
// Use the 'element' function to return an element from the array
$countryval = element('0', $this->input->post('country')); //should work
Have a try..!!
Hi lets say I'm showing a numeric value in an element (not sure what element to use), what i want to achieve is once the numeric value is clicked (Thinking of onclick="this.form.submit();" or submit button) it will submit different designated value from the numeric value let us say. Apple then my sql query would retrieve apple and use it. NOTE: I have multiple numeric values and multiple designated values for each numeric value as an example it looks like this:
(numeric value) = (designated value)
15123 = apple
24151 = orange
39134 = peach
Here so far is what i have.
<input type='submit' name='searchthem' placeholder='<?php echo $numeric_value; ?>'
value='apple'>
** NOTE i have multiple numeric values with different designated value
And this is the SQL in the same page:
SELECT * from tbl_fruits where fruit_name='".$_POST['searchthem']."' ;
Would appreciate some help and ideas, If there is confusion please comment so i may further clarify.
Use select element and just submit the form so that it can process the values. if you wish to use AJAX, use some javascript and output the result in the browser.
If I understand your problem correctly you should add an array for the definition terms and do it like this:
<input type="hidden" name="searchterm" value="<?php echo $numeric_value; ?>" />
<input type='submit' name='send' value="<?php echo $names[$numeric_value]; ?>" />
Then in PHP switch through the values:
switch($_POST['searchterm']){
case(15123) $term = 'apple';break;
case(24151) $term = 'ornage';break;
case(39134) $term = 'peach';break;
}
This will secure your SQL query, too. [Beware: Never use unfiltered input (i.e. $_POST in your example) from the browser in SQL queries!]
I'm making a quiz generator, and I have an HTML form with radio buttons for multiple choice answers. Right now, when I submit my form, the contents of the $_POST variable looks like this when I submit it:
Array ( [a1] => Bob [a2] => Bobby )
(Bob and Bobby are the radio button choices I picked)
I'm generating this form using a PHP function, which returns an array of answers in addition to echoing the HTML form. Is there a way to modify the $_POST variable to have an 'answer' field (for checking my answers), like this:
Array( [a1] => Bob [a2] => Bobby [answers] => Array( [0] => Bob [1] => Bilbo ))
The above was one way I thought of to check answer array with $_POST array.
Edit: More info on what I have so far:
I have a PHP function getTest() that echoes the HTML form, and returns an array with the correct answers.
getTest() generates each question randomly, and as such the correct answers are random.
The main problem is that I have two separate PHP files, questions.php and verify.php.
questions.php echoes the form using getTest(), and has the array of answers.
verify.php only has the contents of $_POST, BUT NOT the array of correct answers.
Is there a better way to check the results of the form submission in general? Thanks!
The best way to do a quiz is to have an answers array and a user input array. Loop through one and compare to the other using the same increment.
You can take all of your post variables and create an array print_r($_POST); Then, loop through this.
$inputArray = //the post data into an array
$answerArray = array('a','b','a');
$numCorrect = 0;
for($a = 0; $a < count($inputArray); $a++)
{
if($inputArray[$a] == $answerArray[$a])
{
$numCorrect++;
}
}
If you want to transmit the answers when submitting the form, you could use inputs of hidden type (like ) which are invisible on the page. However it only takes the user checking the source HTML of the page to see these answers, so it might not be good for your use. Hope this helps
I think what you need to do is a have a look at sessions.
That way on questions.php you can save the answers to a session variable,
Then on verify.php you can read the answers from the session variable and compare them to answered supplied by the $_POST variable
If you really wanted to, you could probably just use a hidden field in your form for submitting an answer array. However, anyone can change your source and modify what the correct answer is.
The best way is to just have an array in your processing script with the same keys (a1, a2), but with the correct answers.
Your processing script would look like this:
$answers = array('a1'=>'Robert', 'a2'=>'Hobo');
foreach($_POST as $key => $value)
{
if (!array_key_exists($key, $answers))
{
continue;
}
if (trim($value) == $answers[$key])
{
// correct
}
else
{
// incorrect
}
}
If you want $_POST to contain an array you can simply use the bracket array notation on the name field of your form.
For example:
<fieldset class="Question1">
<input type="radio" name="answers[]" value="Question1Answer1">Question1Answer1<br>
<input type="radio" name="answers[]" value="Question1Answer2">Question1Answer2<br>
<input type="radio" name="answers[]" value="Question1Answer3">Question1Answer3<br>
</fieldset>
<fieldset class="Question2">
<input type="radio" name="answers[]" value="Question2Answer1">Question2Answer1<br>
<input type="radio" name="answers[]" value="Question2Answer2">Question2Answer2<br>
<input type="radio" name="answers[]" value="Question2Answer3">Question2Answer3<br>
</fieldset>
<fieldset class="Question3">
<input type="radio" name="answers[]" value="Question3Answer1">Question1Answer1<br>
<input type="radio" name="answers[]" value="Question3Answer2">Question1Answer2<br>
<input type="radio" name="answers[]" value="Question3Answer3">Question1Answer3<br>
</fieldset>
(Note that the fieldset tag is optional, I just included it to group things together)
The output in post will be an array $_POST['answers'] that will have one element for each question. So if you selected answer 1 for question 1, answer 2 for question 2, and answer 2 for question 3 you'd have:
$_POST['answers'] = [ 'Question1Answer1', 'Question2Answer2', 'Question3Answer2' ]
Not sure, but looks like you are asking for solution Y, whereas your problem is X (XY Problem)
The XY problem is when you need to do X, and you think you can use Y
to do X, so you ask about how to do Y, when what you really should do
is state what your X problem is. There may be a Z solution that is
even better than Y, but nobody can suggest it if X is never mentioned.
Usually it is not recommended to modify $_POST array, and also not to transmit Answers with the questions to client-side. Instead, the approach should be that because questions.php dont need answers, but verify.php does, so only verify.php shoul have access to answers.
For example, answer-lists are never transported to examination halls along with the question papers on the occasion of exams.
I have taken the liberty to modify your code structure. If you still want to go with your own code, please post it, and then you can get the answers you want.
Try to use this:
question.php:
<form action="verify.php" method="POST">
<fieldset class="Question1"> Complete this: ___<b>bar</b>
<input type="radio" name="answers[]" value="foo">Foo<br>
<input type="radio" name="answers[]" value="too">Too<br>
<input type="radio" name="answers[]" value="cho">Cho<br>
</fieldset>
<fieldset class="Question2"> Complete this: ___<b>overflow</b>
<input type="radio" name="answers[]" value="stack">Stack<br>
<input type="radio" name="answers[]" value="stock">Stock<br>
<input type="radio" name="answers[]" value="stick">Stick<br>
</fieldset>
</form>
answers.php:
//correct answers
$answers = array("foo", "stock");
verify.php:
include("answers.php");
$user_answers = $_POST["answers"];
$user_answers_count = count($user_answers);
$error = "";
for($i=0;$i<$user_answers_count;$i++)
if($user_answers[$i] !== $answers[$i]) //verify
$error[] = "Answer for Question ".($i+1)." is wrong!";
if(empty($error))
//Notify that user has passed the Quiz
else
//Notify that user has NOT passed the Quiz
//print the $error array
Couple of Notes:
I have used answers.php as a different file, but if there is no special requirement, consider merging answers.php & verify.php (put answers.php code on top of verify.php) Even better, you could also merge all these three files into one.
I have assumed that $_POST is sanitized.
Sequence of Questions & answers array is same. i.e. answers[foo] is correct answer for $_POST["answers"][foo]
My problem is a little bit complicate. (I use PHP)
I have two arrays, (simple arrays array[0] = string, array[1] = string...)
OK, now I will display the content of two arrays in a webpage.
The first array contain names and the second images URL.
Images and names are already displayed (my problem isn't here).
But now I want to do something else, add a check box near every image, those checkbox r active by default. Ok, now the user can uncheck some inbox;
The final aim, is to get a new array containing only the values of the names and images that had been checked.
I have thought of something simple, crawl the keys (number) of unchecked checkboxes and unset them from my array. But the problem that I didn't know how to deal with the check boxes
To receive inputs as arrays in PHP, you have to set their name using brackets in HTML:
<label><input type="checkbox" name="thename[]" value="" /> The text</label>
Then, when you access $_REQUEST['thename'] you'll get an array. Inspect it to see its format and play with it :)
first of all i recomend having just one array:
$array = array (0 => array('name' => '....', 'url' => '....'))
i think this will make your life much easier.
Also in the HTML you could also send the array key
foreach ($yourArray as $key=>$value) {
...
<INPUT type="checkbox" name="chkArr[<?php echo $key ?>]" value="1" checked/>
then in your form action you itarate the intial array and remove the unchecked ones.
foreach ($yourArray as $key=>$value) {
if (!isset($_POST['chkArr'][$key]) OR $_POST['chkArr'][$key]!='1') {
unset($yourArray[$key]);
}
}
<INPUT type="checkbox" name="chkArr[]" value="$num" checked/>
After the form is submitted, you'll have array $_REQUEST['chkArr'], in which you'll have numbers of the checkbox that are still checked.
To see which have been unchecked use array_diff($listOfAllNums, $chkArr)