PHP - Unsetting A Specific Element Of An Array

I have a shopping cart, and I am using a php session to track the basket. All works fine, the only problem I have is completely removing the session once the order is placed.

The user places the order, goes through the process and then once complete are sent back to a page called order complete. I have placed the following at the very top of this file:


session_start();
session_unset();
session_destroy();

At first it looks as if the session is destroyed, but when I add an item to the basket it pulls up the item I previously ordered. Is the above the correct way? The session is only the sid?

Hi all,

I would like to ask you if somebody could have a better idea to build this function.

The current one is working, but I feel this built a bit in an amateur manner.

Feel free to add your ideas so we can learn more about PHP and how to deal with arrays.

I have an array:

$arrayVideoSpecs = Array(
    Array(
        'aspect' => '4:3',
        'density' => '442368',
        'resolution' => '768x576'
    ),
    Array(
        'aspect' => '4:3',
        'density' => '307200',
        'resolution' => '640x480'
    ),
    Array(
        'aspect' => '16:9',
        'density' => '2073600',
        'resolution' => '1920x1080'
    ),
    Array(
        'aspect' => '16:9',
        'density' => '121600',
        'resolution' => '1280x720'
    )
);

and I want an array as output grouped by video aspect ratio where the key is the pixel density and the value is the video resolution, namely like that for aspect ratio 16:9 ...

Array
(
    [2073600] => 1920x1080
    [121600] => 1280x720
)

Then I coded this function which is working but seems amateur ...

    function groupAndExtractByAspect($array, $groupBy, $aspect, $density, $resolution)
    {
        $groupByAspect = Array();
        foreach ($array as $value)
        {
            $groupByAspect[$value[$aspect]][] = Array($value[$density], $value[$resolution]);
        }
	        $arrayClean = Array();
        foreach ($groupByAspect as $key => $value)
        {
            if ($key == $groupBy)
            {
                $arrayClean[$key] = $value;
            }
        }
	        foreach ($arrayClean as $aspectGroup)
        {
            $arrayOutput = Array();
            for ($i = 0; $i <= count($aspectGroup); $i++)
            {
                $densityIsValid = false;
                $resolutionIsValid = false;
                if (!empty($arrayClean[$groupBy][$i][0]))
                {
                    $density = $arrayClean[$groupBy][$i][0];
                    $densityIsValid = true;
                }
                if (!empty($arrayClean[$groupBy][$i][1]))
                {
                    $resolution = $arrayClean[$groupBy][$i][1];
                    $resolutionIsValid = true;
                }
                if (($densityIsValid === true) && ($resolutionIsValid === true))
                {
                    $arrayOutput[$density] = $resolution;
                }
            }
        }
        return $arrayOutput;
    }

The usage is as follow ...

$showArray = groupAndExtractByAspect($arrayVideoSpecs, '16:9', 'aspect', 'density', 'resolution');
echo '<pre>';
print_r($showArray);
echo '</pre>';

Thank you very much for your ideas!

Mapg

Hi guys,

I am getting data from a json source:

```

$jsondata = file_get_contents($url);
  $response = json_decode($jsondata, true)
  echo "<pre>"; print_r(array_keys($response));; echo "</pre>";

```

and this returns:

```

Array
(
    [0] => jsonapi
    [1] => data
    [2] => links
)

```

I want  to extract data from specific key in the data array (eg 'title'):

```

    [data] => Array
        (
            [0] => Array
                (
                    [type] => recipes
                    [id] => d6cd7643-6e44-4d26-9ed9-9da7196cef12
                    [attributes] => Array
                        (
                            [internalId] => 7
                            [isPublished] => 1
                            [title] => Deep mediterranean quiche
                            [createdAt] => 2019-05-07T13:34:27+0200
                            [updatedAt] => 2019-05-07T13:34:27+0200
                            [isPromoted] => 1
                            [path] => /recipes/deep-mediterranean-quiche
                            [cookingTime] => 30
                            [difficulty] => medium
                            [ingredients] => Array
                                (
                                    [0] => For the pastry:
                                    [1] => 280g plain flour
                                    [2] => 140g butter
                                    [3] => Cold water
                                    [4] => For the filling:
                                    [5] => 1 onion
                                    [6] => 2 garlic cloves
                                    [7] => Half a courgette
                                    [8] => 450ml soya milk
                                    [9] => 500g grated parmesan
                                    [10] => 2 eggs
                                    [11] => 200g sun dried tomatoes
                                    [12] => 100g feta
                                )

                            [numberOfservings] => 8
                            [preparationTime] => 40
                            [instructions] => 

```

How do I loop through the data array and select just the 'title' and 'difficulty' for example?

Edited May 12, 2019 by ludo1960

<?php
class CsvToArray {
/*
	global $file;
	$file = '../Datafeeds/baseball_all.csv';
*/

public function data() {
$file = '../Datafeeds/baseball_all.csv';
$fileName = fopen($file,'r+');
$all_rows = array();
$header = fgetcsv($fileName);
while ($row = fgetcsv($fileName)) {
$games[] = array_combine($header, $row);
  
}
//print_r($games);
print_r($games[64]["Home Team"]);
}
}

$game = new CsvToArray();
$game->data();
?>

csv: https://anonymousfiles.io/vSubWgPY/

How can I get specific array values outside a class or function? About to try "File put contents" I think. That should work right? So I thought the last couple times. Or what would you suggest?. Overwritten previous attempts to share =[

 

Next up is seeing if I can change $file to $var to change it from other locations. Should be easy I reckon.

Edited April 19 by Minzer

Hello, i retrieve an array from the database that looks something like this:

$var=a:1:{s:2:"cc";a:1:{i:22;s:11:"TESTING";}};

I need to retrieve the number corresponding to the character i: and print it(11 in the first case). 
For example ,
If,
$var=a:1:{s:2:"cc";a:1:{i:15;s:11:"TESTING";}};
I would need to print 15.
$var=a:1:{s:2:"cc";a:1:{i:3;s:11:"TESTING";}};
I would need to print 3.

Thanks in advance.

Hey all.  another quick question.

here is the output of my 2D array:

Code: [Select]

array(2) { ["folder.jpg"]=> array(2) { ["valid"]=> bool(true) ["error"]=> bool(false) } ["file.mp3"]=> array(2) { ["valid"]=> bool(true) ["error"]=> bool(false) } }


how can i foreach my way into getting an iterator that points to the folder.jpg and file.mp3?


as is now, i have something that looks like this:



foreach($arr as $val){

var_dump($val)

}






the var_dump of $val is an *array*.


Thanks for your help!

I need to find out how many times the "mac" key show is in an array.

Code: [Select]
Array
(
[serial] => Robert
[added] => Peter
[mac] => 1232091823
[mac] => 7538572375
[mac] =>943820348239804
[place] =>home
)

Hi all,

I have an array of data. I am looping through this data to generate a CSV file. However, if there are commas in any of the elements then this will throw out the structure of the CSV file.

My question is, how do I loop through the array before I use it to strip out any commas and replace with a space?

Thanks for your help.

I'm teaching myself a bit of OOP in php.  found that i could pass an object into the SESSION array if i serialize() the object and then unserialize() it where i need it in other page files.  all seems to work well until it comes time for a user to logout from my application and attempt to destroy the session.  at times, when they log back in, this serialized SESSION value seems to still be set while other SESSION values have been cleared.  at least i *thinnk* this is what is going on.   in my logout handler, i have the following:

    $_SESSION = array(); // clear all SESSION vars
    setcookie(); // clear cookies
    session_destroy();

but the above does not seem to be working.  my guess is there is something native to serialized SESSION values that im not yet aware of.  any help here would be much appreciated.

Driving myself nuts...can't figure out what is wrong with this code.  This is part of a pagination system that uses an array instead of hitting the db each time.  I am using CodeLobster PHP version (3.7), Windows 7, and using a virtual server on my computer for development (XAMPP)

the error I get is this:
Warning:  Invalid argument supplied for foreach() in C:\xampp\htdocs\website\searchinv.php on line 45

Warning:  array_multisort() function.array-multisort: Argument #1 is expected to be an array or a sort flag in C:\xampp\htdocs\website\searchinv.php on line 49

Warning:  array_slice() expects parameter 1 to be array, boolean given in C:\xampp\htdocs\website\searchinv.php on line 108
 
Warning:  Invalid argument supplied for foreach() in C:\xampp\htdocs\website\searchinv.php on line 146


I am pasting the code below and point out each of the lines in the warnings above, and will try to clean up some so that it's not too extensive...

Here is the problem:  If I click on any of the "page" $_SESSION['rows'] has all the correct information contained in it.  However, if I trigger the "re-sort" select option...$_SESSION['rows'] is empty...all my other $_SESSION variables are still there.  At first I thought it was an issue with too many "if/ifelse/else" statements or a wrong syntax...so I changed it to a "switch" and traced it closely.  I don't see anything wrong.  Next I thought it was caused by the JavaScript "onchange" event...so I took that out...and replaced it with just a submit button...same result.  I've done a search on the page for EVERY $_SESSION['rows'] and found only 4 and none of them should blank it out...I've been going crazy on this code for 2 days I'm pulling my hair out now...can ANYONE help?
Code: [Select]
  if(!empty($_POST))
    {
  if(empty($_POST['page']))
    {
  switch($_POST)
    {
  case (!empty($_POST['ref'])):
    $deleted=sql_ending($_POST['del']);
    $rows=select_from_database('inventory', '*', 'ref_number=\''.$_POST['ref'].'\' and '.$deleted);
    break;
  case (!empty($_POST['type'])):
    $sort=$_POST['sort'];
    $deleted=sql_ending($_POST['del']);
if($_POST['type']!='*')
                      {
                  $type=$_POST['type'];
                $len=strlen(trim($type));
            if($len!=1)
              $type=$type.'-'; 
                  $end=$deleted.' and ref_number like \''.$type.'%\'';
                      }
else
    $end=$deleted;
                    $rows=select_from_database('inventory', '*', $end, $sort);
break;
  default:
            $data=$_SESSION['rows'];
    $sorts=explode(' ', $_POST['sort']);
    $keys=$sorts[0];
    $order=$sorts[1];
Line 45 -->           foreach ($data as $key => $row)
      {
                                $column[$key]=$row[$keys];
                               }
Line 49 -->           $rows=array_multisort($column, $order, $data);
    break;
    }  
                  $_SESSION['rows']=$rows;
    }
  $x=count($_SESSION['rows']);
  if(isset($_SESSION['admin_user']))
      $width=1280;
  else
      $width=900;
  $srch_rslt= '            <div id="displaybox">
              <div id="translucent"></div>
              <div id="result" style="width:'.$width.'px;">
              <!--[if lt IE 7]>
                <h3 class="center">This site looks much better with IE 7 and above.&nbsp; Please consider upgrading <a href="browsers.php">HERE</a>.</h3>
              <![endif]-->
';
  if($x==0)
      $srch_rslt.='                <h3>Search Result</h3>
                <a style="display: block; margin-right:10px;" href="searchinv.php" title="Close this box.">Close&nbsp;<img src="images/close.png" alt="Close this box." /></a>
                <p>We are sorry, but we currently do not have the equipment available for the given search.&nbsp; Please go back and <a href="searchinv.php" title="Search Again">search again</a>, or <a href="mailto:mywebsite@mywebsite.com" title="Send us an email so we can locate the equipment you need." onclick="popup(\'email.php?title=pray\', \'Request for Equipment\', 500, 500); return false">contact us</a> so we may begin to utilze are vast resources to locate your needs.
              </div>
             </div>
';
      else
    {
  if(empty($_POST['page']))
      $pg=1;
  else
      $pg=$_POST['page'];
      $page=($pg-1)*20;
      $_SESSION['pages']=ceil($x/20);
  if(!$_SESSION['pages']>1)
      $buttons='<button type="button" class="active" title="Page 1">1</button>
';
  elseif($pg>1)
    {
  $prev_pg=$pg-1;
      $buttons='<button type="submit" class="button" title="First" value="1" name="page">&lt;&lt; First</button>
                              <button type="submit" class="button" title="Previous" value="'.$prev_pg.'" name="page">&lt; Prev</button>
';
}
  for($i=1; $i<=$_SESSION['pages']; $i++)
    {
  if($i==$pg)
      $buttons.='                              <button type="button" class="active" title="Page '.$pg.'">'.$pg.'</button>
';
  else  
      $buttons.='                              <button type="submit" class="button" title="Page '.$i.'" value="'.$i.'" name="page">'.$i.'</button>
';
}
  if($pg<$_SESSION['pages'])
    {
  $next_pg=$pg+1;
      $buttons.='                              <button type="submit" class="button" title="Next" value="'.$next_pg.'" name="page">Next &gt;</button>
                              <button type="submit" class="button" title="Last" value="'.$_SESSION['pages'].'" name="page">Last &gt;&gt;</button>
';
}

Line 108 -->  $results=array_slice($_SESSION['rows'], $page, 20, true);
      $srch_rslt.='                <h3>Search Complete!</h3>
                <a class="close" href="searchinv.php" title="Close this box.">Close&nbsp;<img style="border:none;" src="images/close.png" alt="Close this box." /></a>
                <p>You may now browse, re-sort and download your results in either PDF or an Excel format.</p>
';

        if (isset($_SESSION['admin_user']))
    $table = 1260;
else
    $table = 880;
$tableinner = $table-20;
      $srch_rslt.='                <form name="search_page" method="post" action="searchinv.php?search='.$_POST['search'].'">
                  <div style="border:2px solid #00000; width:'.$table.'px;">
 
           /* there's a table here */
';
          $y=0;
Line 146 --> foreach($results as $result)
            {
              $y++;  
  $cl_type=explode('-', $result['ref_number']);
  $type=select_from_database('car_types', '*', 'abbvr=\''.$cl_type[0].'\'');
  $raw_notes=$result['notes'];
                  if ($raw_notes == NULL)
              $notes="Call for additional information.";
                  elseif (strlen($raw_notes) >65)
            {
              $txtlth=strpos($raw_notes, " ", 65);
      $notes=substr($raw_notes, 0, $txtlth).'<span id="para'.$pg.$y.'" class="jshide"> '.substr($raw_notes, $txtlth).'</span><a class="jsunhide" href="javascript:function(){};" onclick="toggleMe(\'para'.$pg.$y.'\', \'href'.$pg.$y.'\')" id="href'.$pg.$y.'" style="text-decoration: none">...[click for more]</a>';
        }
  else
      $notes=$raw_notes;

          $srch_rslt.='  /*just some html output stuff */

      $srch_rslt.='                            </table>
                          </div>
                          <div>
                            <input type="hidden" name="search" value="'.$_POST['search'].'" />
                            <p class="center">
                              '.$buttons.'                            </p>
                          </div>
                        </td>
                      </tr>
                    </table>
                  </div>
                </form>
                <div class="search_menu_wrapper">
                  <ul class="sermenu">
                    <li>Need to search again?&nbsp; Back to the <a href="searchinv.php" title="Do another search.">search page</a>.</li>
                    <li>Download this search to a <a href="http://www.mywebsitedowloadpdf.php?search='.$_POST['search'].'" title="Download to .pdf.">.pdf&nbsp;<img src="images/adobe.png" style="width:15px; height:15px; border:none;" alt="Download in Adobe PDF format." /></a></li>
                    <li>Download this search to a <a href="http://www.mywebsitedowloadexcel.php?search='.$_POST['search'].'" title="Download to MS Excel.">MS Excel&nbsp;<img src="images/excel.png" style="width:15px; height:15px; border:none;" alt="Download in MS Excel format." /></a></li>
                  </ul>
                </div>
Like I said if I click a "page" button (stored in the $buttons var and printed above)...the code works beautifully...it's when the next lines (below) are triggered that cause $_SESSION['rows'] to be empty...I just don't get it

Code: [Select]
                <div style="text-align:center;">
                  <form name="re_sort" method="post" action="searchinv.php?search='.$_POST['search'].'">
                  <label class="form-label-left" id="l_sort" for="sort">Re-Sort By:</label>
                  <div class="form-input">
                    <select class="form-dropdown" style="width:190px" id="sort" name="sort" onchange="this.form.submit();">
                      <option value="ref_number SORT_ASC" selected="selected"> Reference Number - Ascending </option>
                      <option value="ref_number SORT_DESC"> Reference Number - Descending </option>
                      <option value="date_added SORT_ASC"> Date Added - Ascending </option>
                      <option value="date_added SORT_DESC"> Date Added - Descending </option>
                      <option value="last_update SORT_ASC"> Date Updated - Ascending </option>
                      <option value="last_update SORT_DESC"> Date Updated - Descending </option>
';
if($_SESSION['admin'] == 10)
    $srch_rslt.='                      <option value="source SORT_ASC"> Source - Ascending </option>
                      <option value="source SORT_DESC"> Source - Descending </option>
';
    $srch_rslt.='                    </select><button type="submit" value="submit">Submit</button>
                  </div>
                  </form>
                </div>
              </div>
            </div>
            <script type="text/javascript" language="javascript">
              //<![CDATA[
                document.body.style.overflow="hidden";
              //]]>
            </script>
';
        }
  }
  echo $srch_rslt;

HI, I'm having trouble with unsetting a key from SESSION. I can unset the cart, but when I try to target the key, it doesn't work.
    Are there some regular things I should be looking for? The only thing I can think of is that I'm re-initializing the key by accident elsewhere in my code.

if(isset($_POST['mainCartDelete'])){
    
    unset($_SESSION['cart_array'][21]); 
       
    $sessionArray = $_SESSION['cart_array'];     
  
    print_r ($sessionArray);
   
}

Print_r returns

Array ( [0] => Array ( [item_id] => 21 [quantity] => 1 ) ) 

Edited by 7blake, 10 December 2014 - 01:43 PM.

How would you access the number 10 in the $arr array?

Hi there!

Ok I've a very simple code he

$character = array (name=>"Joe",
                    occupation=>"Programmer",
                    age=>30,
                    "Learned language "=>"Java"
);
print_r($character);

echo "<br/>";
foreach ( $character as $key=>$val ){
   print "$key = $val <br>";
}

The output is:

Code: [Select]
Array ( [name] => Joe [occupation] => Programmer [age] => 30 [Learned language ] => Java )
name = Joe
occupation = Programmer
age = 30
Learned language = Java
Now instead of returning all the other elements, I just need to display only the first element in the array that is the value 'Joe'.

I tried
$val[name];

Output I get is not what I want:

Code: [Select]
J
P

J
All responses/feedbacks is always welcomed

Thank you!

Given the following example code; if a function were passed the value of $id is there a way to point to the previous or next element in the array to retrieve their values.

thanks


Code: [Select]

$arr = array();

for( $i = 0; $i < 10; $i++ ) {

$id = mt_rand() + $i;

$arr[$id] = "some value";

}

function getValue( $id ) {

$element = $arr[$id];

//point to previous element or next element beginning from $element position

}