push array key and value in associative array - php

Question

I want to push array into existing session array. I would like to use get[id] and I want to be able stack all the arrays added rather than delete them when a new array is pushed.
Bellow is my code and I am not getting the value, instead I get this error --- Array to string conversion. Thanks in advance.
**CODE
<?php
session_start();
if(empty($_SESSION['animals']))
{
$_SESSION['animals']=array();
}
// push array
array_push($_SESSION['animals'], array ( 'id' => "".$_GET['id'].""));
foreach($_SESSION['animals'] as $key=>$value)
{
// and print out the values
echo $key;
echo $value;
}
?>

Answer 1

With your code, this is what $_SESSION looks like:
array (size=1)
'animals' =>
array (size=1)
0 =>
array (size=1)
'id' => string 'test' (length=4)
In your code :
foreach($_SESSION['animals'] as $key=>$value)
key will contain 0 and value will contain array('id' => 'test'). Since value is an array, you cannot echo it like this.
If you want to echo all the characteristics of each animal, this code will work :
<?php
session_start();
if(empty($_SESSION['animals']))
{
$_SESSION['animals'] = array();
}
// push array
array_push($_SESSION['animals'], array ( 'id' => "".$_GET['id'].""));
// We go through each animal
foreach($_SESSION['animals'] as $key=>$animal)
{
echo 'Animal n°'.$key;
// Inside each animal, go through each attibute
foreach ($animal as $attribute => $value)
{
echo $attribute;
echo $value;
}
}