I have an html page with a form. In the form I have a search function and a delete function that will be available in each results’ row, in this way:
..<td><img src="delete.gif" style="cursor: pointer" onClick="javascript:delete();"></td>..
<input type="submit" value="search" onClick="javascript:search();">
In a . js file I have both functions passing the parameters to a php file via jquery’s ajax function.
Let’s go to the php file:
There are no problems with the search function: I get the parameters by $_REQUEST and I do a select query.
By clicking delete.gif in the form, I get to the delete function. The query deletes the selected row and right after I need to call the search function so I can show the results without the deleted row.
And here comes the trouble: both functions use $_REQUEST to build the queries so when calling search function after deleting I have the delete parameters stored in $_REQUEST.
How can I recover the search parameters I had in $_REQUEST in the first search so I can do that search again after deleting??
Here’s a glimpse of the delete function in the php file:
function deleteResult($_REQUEST['param1'],$_REQUEST['param2'], $_REQUEST['param3'])
{
$strSqlDelete = "DELETE FROM …"; // query working in database
//here the connecting to the database code
$result = search($_REQUEST['param1'],$_REQUEST['param2'], $_REQUEST['param3']);
echo utf8_encode($result);
exit();
}
Thanks a lot!!
It's not too safe to use $_REQUEST superglobal. Use $_POST or $_GET depending on your method. To store something for later use use $_SESSION suberglobal array.
session_start(); // In the beginning of your script
...
$_SESSION['param1'] = $_REQUEST['param1'];
Then you can use $_SESSION['param1'] anywhere else within your site even after page reloading.
Store it in the local variables or you can store them into the cookies. So that you can use it as many times you want.
you can also do that by javascript
it's prefer to delete this row by deleting it instead of calling server side again to render the result again
now you save unwanted hit to server side
FOR EXAMPLE
// in JS
function delete(this){
$.ajax({}); // call ajax to delete from server side (php)<br>
delete this row (tr);<br>
}
Related
I have problem in print PDF from forms.
When new user go to my site and fill the forms and click submit to send data, i need to get this data in PDF file, So i can get the data for this user from :-
$lastid = mysql_insert_id();
But this i think is not good, When any other user go in this form and click print PDF, he get the last id.
So what can i do to delete the last id and cannot print any data for any user else have fill forms ??
I assume that you are getting data into $lastid because of mysql query execution if that so your query will be executed every time and the result will change depending upon users and their requirement.
But if you still want to do so you can use unset() function of php.
unset() destroys the specified variables. The behavior of unset() inside of a function can vary depending on what type of variable you are attempting to destroy. If a globalized variable is unset() inside of a function, only the local variable is destroyed. The variable in the calling environment will retain the same value as before unset() was called.
To unset() a global variable inside of a function, then use the $GLOBALS array to do so:
<?php
function foo()
{
unset($GLOBALS['bar']);
}
$bar = "something";
foo();
?>
Complete documentation can be found over here
I got a Index page on which search page is included, and when I submit it, it passes values to find.php through action and method post. The code is below
if($_POST['searchsubmit']=="Search"){
$cat=$_POST['searchcategory'];
$area=$_POST['searcharea'];
$term=$_POST['searchbox'];
}
The above code is written on find.php, Now when I try to implement paging through basic paging method with where conditions to make appropiate search query
$where="where approved='yes'";
if($term!=""){
$where.=" and name like '%$term%'";
}
if($cat!=""){
$where.=" and category like '%$cat%'";
}
if($area!=""){
$where.=" and area like '%$area%'";
}
$start=0;
$end=5;
if($_GET['page']!="")
{
$start=$_GET['page']*$end;
}
Where $start is my initial limit, and $end is my number of records. For the first page of paging, I pass a variable page with 0 for first page
First
and my search query now becomes
$que="select * from shops ".$where." ORDER BY likes DESC limit $start,$end";
As soon as I click on "first", My new link become "/find.php?page=0"
and the post values which I recivied from index page search bar are lost.
Is there any way to retain those values ?The two methods which I though are sending them again through url with GET, or the other way is to store them in session.
Is there any third method available ?
Marc is absolutely right. Do not use the code as it is.
As an alternate solution to your problem -
Your page index.php (search form) submits to itself
Assemble your search query as querystring in index.php if its a post
Redirect to find.php with the assembled querystring
Every search information will always be in the querystring.
Use your pagination happily.
The comments are correct.
Use:
// Start the session
session_start();
// Save variables into session
$_SESSION['somevalue'] = $_POST['value'];
Then when any page calls session_start it will have access to $_SESSION['somevalue']
Also, you are wide open for SQL injection. Sanitize your values to ensure no one can put arbitrary sql code into the string. if you are using mysqli it should as simple as this:
// After connecting to the DB
$_POST['somevalue' = $mysqli->real_escape_string($_POST['somevalue']);
Then be sure to hardcode quotes around string values like you are doing.
If you want to be safer you can use prepared statement instead.
Hope this helps.
I have 2 php pages: query.php and result.php.
In query.php, I am executing a query (select) statement. It's returning a resultset
$rs = mysql_query($query);
Now I want to return this resultset from query.php to another page result.php and work with it. Like this:
In query.php:
return $rs
and in result.php:
$result = executeQuery($query) // we get the resultset in this variable
while ($row == mysql_fetch_array($result){
//do something
}
If the above is not recommended, please provide me with alternatives. But I want the query function and resultset in different pages.
You could just include results.php in your query.php page if you're just looking to keep the code separate in the source files but aren't actually required to redirect from one page to another:
In query.php:
$rs = mysql_query($query);
include "results.php";
In results.php:
while ($row == mysql_fetch_array($rs){
//do something
}
As far as trying to "return $rs" from one page to another that's not how PHP works. The return statement is only valid within a function. If you want to actually pass data from one PHP page to another and will be redirecting to that other page then you'll need to use either a session, a cookie, pass it in the URL (i.e. use GET) or use curl and add it as a POST var.
If this is really the way it must be, store the result set in a database somewhere or in a file and give each result a unique name. Then pass that name to the next page so it can be retrieved.
query.php will redirect to result.php?result_set=ab24sdfsdfklls for instance.
This has the added advantage that you can use the result_set as often as you want. Visitors can have multiple result sets during one visit. They can share the URL of the result set page with other people, etc.
Just be sure to eventually prune the data store as it will just keep on growing, but that's another matter entirely.
piece of file1.php:
Add this to DB
This takes the user to a page where the data gets inserted into the database.
file2.php :
$clicked = $_GET['addid'];
$_SESSION['clicked'] = $clicked;
// data gets inserted
header("Location: file1.php?id=$clicked");
But I have got multiple pages (like: file1.php?id=1 | file1.php?id=2 | file1.php?id=3 etc.).
Can the session variable handle multiple numbers? Is there any way to do this?
Any help appreciated.
(P.S.: Currently I am using the GET method to disable the links, but I think SESSION is more reliable.)
(P.P.S.: I need this for a voting script.)
To hold more data in one session variable, you need to create a multi-dimensional array which will hold multiple against $_SESSION['checked']. You can do this like:
$clicked = (int)$_GET['addid'];
$_SESSION['clicked'][$clicked] = true;
// data gets inserted
header("Location: file1.php?id=$clicked");
(also, you should be sanitizing $_GET['addid'].
Then to check if it is set, you can use array_key_exists:
if(array_key_exists($clicked,$_SESSION['clicked'])){
echo "this button should be disabled!";
}
I am not sure I understood right your question, but if it is how to send an array of data with the same id via an http request you can use this syntax for the url
file.php?arr[]=val1&arr[]=val2&arr[]=val3
from your php code you would access the values as a regular array
Can the session variable handle multiple numbers? Is there any way to do this?
The session variable can store an array
$_SESSION['clicked'] this session variable can store one value at a time.
If you want use 2 dimension array to handle multiple values.
$clicked = $_GET['addid'];
Ex: $_SESSION['clicked'][$clicked];
firstly concatinate all the ids with comma in a string as $var = 1,2,3,4 and then pass it using GET.
Then there on that page you can explode it from comma and can store it in array and then foreach loop for the array will do it for you. Hope it works.
In my project, I am using pagination and I used these statements to get the page number detail:
$page=$this->uri->segment(3);
$this->session->set_userdata('page',$page);
echo $this->session->userdata('page');
When I print this session value in that page itself, I get the value correctly and when I click on the particular link and then print that data, I am getting the value like 'images'.
Why is this happening?
However, when I write the statements like
$page=$this->uri->segment(2);
$this->session->set_userdata('page',$page);
echo $this->session->userdata('page');
it's working fine.
My URL is: http://localhost/CI/user/index/4
I have the same problem with you, the session variable always get value 'images'. Then i realize that: if we made a session variable, then we must call redirect() directly.
This is my example:
$page=$this->uri->segment(3);
$this->session->set_userdata('page',$page);
redirect('control/function2');
Then, you can get continue your code in the 'function2'.
Solved the issue by writing another function, setting the session and redirecting to above function like this:
function set_session(){
$id=$this->uri->segment(3);
$this->session->set_userdata('id',$id);
redirect('set_uri_session');
}
function set_uri_session(){
$id=$this->uri->segment(3);
$this->session->set_userdata('id',$id);
echo $this->session->userdata('id');
}