I haven't use PHP for some time, and I need some help to create some lines of code. I wrote this line of code some years ago for a website
array_push($_SESSION['buildingsAlreadySeenList'],$id);
This is my problem, I just want to iterate through the array and put the first value at index 0 to $buildingId and then next time put the value of index 1 to $buildingId with som While loop i guess? I know it's easy, but sadly I haven't used PHP for some time! Preciate the help! Thanks!
Use foreach()
foreach($_SESSION['buildingsAlreadySeenList'] as $id => $value) {
echo $id; // this is the index and for the first time this is like to give o if the indexes were not manipulated somehow
//put the index value to buildingid
$buildingId = $id;
echo $value; //the actual value of the array
}
Update
To check if the array is empty count the variables
if(count($_SESSION['buildingsAlreadySeenList'])) {
//array is not empty
} else {
//array is empty
}
Related
I had a problem with my array_push, that i noticed.
So what i'm doing.:
I have a site, where there are some buttons with a specific value.
Each value is getting fetched from a database.
I have a session called test, that get's converted to an array(to store multiple in the same array)
Everytime one of the buttons are clicked, the value for that specific button, is getting pushed to the array.
But, i can ONLY see that it has been pushed at the second try.
[test] => Array( [0] => 21304 )
This is what i see, after second try. But my array count, says that there are 2 elements, in that array.
Here is my code:
if(isset($_POST['process'])) {
if(!isset($_SESSION['test'])) {
$_SESSION['test'] = array();
$array_merge = array_push($_SESSION['test'], $_POST['process']);
}
}
The $_POST['process'] is the button with the unique value.
Can somebody maybe see what I'm doing wrong here?
Kind regards
You are only adding to the $_SESSION['test'] array if $_SESSION['test'] was not previously set.
So you need to always add an occurance to the session array and only initialise the session array if it was not previously set
session_start();
// ...
if(isset($_POST['process'])) {
if(!isset($_SESSION['test'])) {
$_SESSION['test'] = array();
}
$_SESSION['test'][] = $_POST['process'];
}
NOTE from the manual
If you use array_push() to add one element to the array, it's better to use $array[] = because in that way there is no overhead of calling a function.
I have this array in php code. I want to have that whenever page is being called it should print value of first array index and when next time second value of array index and so on... what modification I could do? for now it´s printing everything when being called single time.
<html>
<?php
$addresses = array('ifcbxespra', 'ifcheqjbmea', 'ifcqiknsa', 'ifcqirtjla', 'ifcwqsrlmn', 'ifclmkmzhz','ifcwdujhgc','ifcihddngh','icffhzudcd','ifchnsqzgs','ifcgssqrhg');
foreach ($addresses as &$value) {
echo $value ;
}
?>
</html>
I'm not sure if I understood what you want. But if you want to print the first array's value when the page loads one time, the second array's value when the page loads another time and so on, you can do this:
<?php
if(!isset($addresses) || empty($addresses)){ //checks if the array is not initialized or if it's empty
$addresses = array('ifcbxespra', 'ifcheqjbmea', 'ifcqiknsa', 'ifcqirtjla', 'ifcwqsrlmn', 'ifclmkmzhz','ifcwdujhgc','ifcihddngh','icffhzudcd','ifchnsqzgs','ifcgssqrhg');
echo $addresses[0]; //print the first value
array_splice($addresses, 0, 1); //removes the first element of the array and reindexes it
}else{
echo $addresses[0]; //print the first value
array_splice($addresses, 0, 1); //removes the first element of the array and reindexes it
}
The logic behinds it is: if the array already exists and is not empty (it has values), print the first value and then remove it, so next time the first value will be the second actual value. When the array is empty, redefine it as to start again.
You can search for more information on array_splice() here.
P.S.: you have to use PHP's $_SESSION to save the array between the pages.
You can use something like $_SESSION and store there the last index.
For example:
$array = array('one', 'two', 'three');
if (!$_SESSION['nextIndex'] || $_SESSION['nextIndex'] >= count($array)) {
$_SESSION['nextIndex'] = 0
}
// print the value
echo $array[$_SESSION['nextIndex']];
// increment the nextIndex
$_SESSION['nextIndex']++;
NOTE: This will only work for the same user. Each page reload will increment the array index. But if you need some cross-user counting, then you have to store the information somewhere on the server, like a DB or even a simple txt file.
Check out this example: http://hibbard.eu/how-to-make-a-simple-visitor-counter-using-php/
Finally I solved this problem with the MySQL. created a column with all code. and then call the script every-time when user press button. In the script first I fetch first raw and print that value, and then, delete that raw. so every-time user will get unique value from the list of code And it is working fine.
i have an array result. i want to print 2 rows(product data) in first page.
next 2 rows in second page and so on. if anybody knows this,please help me to solve it
my array
$data['product_list']
foreach($data['product_list'] as $dat)
{
echo $dat->prd_id;
echo $dat->prd_name;
}
You are doing a foreach loop on an associative array and then trying to access the the contents as objects by using ->. I can only given assumption of what you might be doing. If your array is already populated with a name and id like you have described in your foreach loop this is how you would access the contents in the loop:
foreach($data['product_list'] as $dat)
{
echo $dat['prd_id'];
echo $dat['prd_name'];
}
That is how you would print out the contents providing you had the data stored in your array like so:
$data['product_list'][0] = array('prd_id'=>'id0','prd_name'=>'name0');
$data['product_list'][1] = array('prd_id'=>'id1','prd_name'=>'name1');
$data['product_list'][2] = array('prd_id'=>'id2','prd_name'=>'name2');
Better you try with array_slice();
<?php
$a=array("red","green","blue","yellow","brown");
print_r(array_slice($a,2));
?>
I just started learning PHP and I am having some difficulties with some of the coding.
Hopefully, someone could help me a little.
I'm using this:
if(!empty($_POST['yyy'])) {
foreach($_POST['yyy'] as $a1) {
echo " $a1";}}
The echo will write several results of $a1 depending on how many were selected in the form.
What I want is to save those results to some values so I can add them in MySQL.
Something like this:
if(!empty($_POST['yyy']))
{
foreach($_POST['yyy'] as $a1)
{
echo " $a1"; where $a1 will create a $result1,$result2,$result3(for each isset)
}
}
Then if I use:
echo "$result2";
it will give me the second result.
Not clear whether you are asking about this kind of result or not. But you can use an array to store each values inside the foreach loop.
var data=[];// define an array to access outside of if statement later..
if(!empty($_POST['yyy'])) {
foreach($_POST['yyy'] as $a1){
data[]=$a1;
//or can use array_push() method
array_push(data,$a1);
}
}
/*this will give the second result(because array indexing starts from 0. So to get third result
use data[2])*/
echo data[1];
Furthermore by echoing quoted variable will not give the value of that variable but gives a string literal.
echo "$result2" //output---> $result
<?php
session_start();
$_SESSION['del']=array("a1","a2","a3","a4","a5");
unset($_SESSION['del'][0]);
echo implode(" ",$_SESSION['del'])
?>
How do I remove each array element one by one every time I refresh the page?
here is the code
<?php
session_start();
if(isset($_SESSION['del'])) { // to make sure array is not set again as in question
unset($_SESSION['del'][0]); // remove the first element
$_SESSION['del'] = array_values($_SESSION['del']); // to shift rest of the elements one location left for making indexes starts from 0
} else { // set session array only once
$_SESSION['del']=array("a1","a2","a3","a4","a5");
}
echo implode(" ",$_SESSION['del']); // print results
?>
if(isset($_SESSION['del']))
{
if(is_array($_SESSION['del']))
{
array_shift($_SESSION['del']);
}
}
Code Explanation
if the session del is currently set.
and that the session['del'] is an array
remove the first value of the array del.
I am not sure if it works with $_SESSION, but if it is an array then array_shift() would be what you are looking for:
array_shift($_SESSION['del']);