如何遍历$ _SESSION并从数组中打印值

Question

I have created three files and in one of them i would like to make a loop over a Section to output the name and the price from my array

 <?php
 session_start();
 ?>
<?php 
  $a=array(
      array('id'=>'1','name'=>'Milch','price'=>'12'),
      array('id'=>'2','name'=>'Reis','price'=>'13'),
      array('id'=>'3','name'=> 'Öl', 'price'=>'14'),
      array('id'=>'4','name'=>'Salz','price'=>'15'),
      array('id'=>'5','name'=>'Zucker','price'=>'16'),      
        );       
if(empty($_SESSION['warenkorb'])){       
   echo 'Warenkorb leer';
   }           
else {                          
   foreach($_SESSION['warenkorb'] as $key=>$value){ 
   $_SESSION['warenkorb']=array();            
   print_r($value['name'].': '.'$'.$value['price'].PHP_EOL.'<br />');
     }
   }                                      
  ?>

And this is another file with a lesson that i output from it only the id

<?php
session_start();
?>
 ?php         
     include 'produkte.php';           
     if(!isset($_SESSION['warenkorb'])){  
       $_SESSION['warenkorb']=array();
         }                                
        if(isset($_POST['id'])){             
        foreach($a as $key =>$value){  
        if($value['id']==$_POST['id']){                     
           $_SESSION['warenkorb'][]= $_POST['id'];              
          }              
         }
        }     
        print_r(count($_SESSION['warenkorb']));          
   ?>

Answer 1

In first code you need to change some bit in the else part:-

else {                          
    foreach($_SESSION['warenkorb'] as $key=>$value){  //iterate over SESSION array
        foreach($a as $v){ //iterate over $a array
            if($value == $v['id']){ //compare SESSION is with $a sub-array id         
                echo $v['name'].': '.'$'.$v['price'].'<br />'; // if match then echo name and price from sub-array
            }
        }
    }
}