3/26/15

PHP Array


All the variables you have used have held only a single value.

Array variables are “special” because they can hold more than one value in one single variable.
This makes them particularly useful for storing related values.

There are three types of array.

  • Indexed array : An array with a numeric index
  • Associative array : An array where each key is associated with a value
  • Multidimensional array : An array containing one or more array

How to define an array


Eg i
  <?php
 
  $arr = array(10,11,12,13,14,15);
  
  echo $arr[0]; 
  
 ?>
      Output : 10

In the above example
This method is to create a numeric array. Here index are automatically assigned to array element.
All values are store in the form of array corresponding to their index value. i.e $arr[0]=10,$arr[1]=11 and so on.
we want to print first value of array, for this we call array name with their index ($arr[0]):
So output is 10.
Eg ii
  <?php
 
  $arr[]=10;
                $arr[]=20;
  $arr[]=30;
                $arr[]=40;
                $arr[]=50;
       echo $arr[0]; 
 ?>
     Output : 10

In the above example
This is second method to create a numeric array. Here also index assigned automatically.
The output is same as previous one.
Eg iii
  <?php
 
  $arr[0]=10;
                $arr[1]=20;
  $arr[2]=30;
                $arr[3]=40;
                $arr[4]=50;
       echo $arr[0]; 
  
 ?>
     Output : 10

In the above example
This method is also to create numeric array. But indexed assigned manually in this program.
The output is same as previous one

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