PHP Nested Array

Syntax

 array(array(val1, val1, val2..), array(val1,val2,val3..))

Create a two dimensional numeric array and find the sum.

Eg i

<?php
error_reporting(1);
$arr=array(array(10,10,10),array(10,10,10),array(10,10,10));
$s=0;
$s1=0;
//using for loop:
for($i=0;$i<3;$i++)
{
 for($j=0;$j<3;$j++)
 {
 echo $arr[$i][$j]." ";
 $s=$s+$arr[$i][$j];
 }
 echo "<br>";
}
echo "sum of array:".$s;
 
      ?>

Output :  10 10 10
          10 10 10
          10 10 10
          sum of array : 90

In the above example
Create a variable $arr with value an nested array.
Here at the place of array’s first element there is also an array with three value like
$arr[0][0]=10, $arr[0][1]=10, and $arr[0][2]=10.
at the second index the value are : $arr[1][0]=10, $arr[1][1]=10, and $arr[1][2]=10.
at the 3rd index the value are : $arr[2][0]=10, $arr[2][1]=10, and $arr[2][2]=10.
Now first call all nested array using for loop. first for loop call the three array(row) one by one, inside this loop again call a for loop i.e used to call first array’s all value(columns of row),
print it using echo statement and also make sum ans store inside a variable $s.
So the output will display:
first row’s three column i.e 10 10 10
second row’s three column i.e 10 10 10
Third row’s three column i.e 10 10 10
and the final sum is 90

Create a two dimensional numeric array and find the sum using for-each

Eg ii

 <?php
error_reporting(1);
$arr=array(array(10,10,10),array(10,10,10),array(10,10,10));
$s=0;
$s1=0;
//using for loop:
foreach($arr as $k)
{
  foreach($k as $v)
   {
   echo $v;
   $s1=$s1+$v;
   }
 echo "<br>";
}
echo "sum of array:".$s1;

?>

Output :  10 10 10
          10 10 10
          10 10 10
          sum of array : 90

Two dimensional associative array( user’s name and mobile number)

Eg iii

<?php
error_reporting(1);
$arr=array(array("name"=>"neeraj","mob"=>342353534),
           array("name"=>"rohit","mob"=>34235),
           array("name"=>"deepak","mob"=>33534)
          );
echo '<table border="2">';
echo '<tr>';
echo '<td align="center">Name:</td>';
echo '<td align="center">MOb:</td>';
foreach($arr as $k)
{
echo '<tr>';
foreach($k as $v)
{
echo '<td align="center">'.$v.'</td>';
}
echo '</tr>';
}
echo '</table>';

?>

Output :

Name
Mobile
neeraj
342353534
rohit
34235
deepak
33534

Two dimensional associative array

Eg iv (display city according to selected country)

<?php
 $country=array("ind"=>array("Lucknow","Rajasthan","Delhi"),
            "pak"=>array("Islamabad","Lahore"),
            "ch"=>array("ch1","ch2")
           );
if(isset($_GET['display']))
 {
 $get_country=$_GET['c'];
echo "City ";
 foreach($country as $country_key => $cname)
   {
     if($country_key==$get_country)
    {
         echo "<select>";
       foreach($cname as $state)
         {
  echo "<option>".$state."</option>";
   }
  echo "</select>"; 
           }
      }
 }

?>
<form method="get">
<select name="c">
<option value="ind">india</option>
<option value="pak">Pak</option>
<option value="ch">china</option>
</select>
<input type="submit" value="submit" name="display"/>
</form>

Output : select country             Lucknow            Rajasthan            Delhi            
                  City                          india            Pak            china                                          
                     

In the above example
first create an array in which multiple index(country) are defined as array, on that array multiple city defined(as column of row).
Now user has to select his country name from select box.
according to selected country, find the city i.e stored on country index using foreach loop.

Multidimensional associative array

Syntax

 array(array(array(array(val1, val1, val2....))))

Eg v

 <?php
    $country=array("pak"=>"pakistan","ind"=>array("br"=>"bihar",
   "dl"=>array("Nd"=>"North delhi","sd"=>"south delhi",
   "Ed"=>array("dwarka","uttam nagar"))));

 echo $country["ind"]["br"]."<br/>";
 echo $country["ind"]["dl"]["Nr"]."<br/>";
 echo $country["ind"]["dl"]["Ed"][0];
 
?>

 
Output : bihar
  North delhi
  dwarka