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Array Function in PHP Programming

Array functions: - PHP provide various functions to perform different operations on array like searching, sorting, merging, splitting etc.  Here we have some important php functions which used to perform major operations on PHP array.

sort():- This function is used to sort the array according to its value. For example

$names=array (‘a’,’c’’b’);
Sort ($names);
After execute this funcitn the array will be
$names=array (‘a’,’b’’c’);

sizeof():- This function is used to determine size of array. This function return number of elements available in that array. For example

Here in $s we have 4. This is size of this array.

array_merge():- This function is used to merge two array. For example

$first = array ('hello', 'world');    
$second = array ('exit', ‘here’);    
$merged = array_merge ($first, $second);
After execute this code the $merged array will be
// $merged = array ('hello', 'world', 'exit', 'here')

•     array_reverse() :- This function is used to reverse the array elements. For example

$array=array (1,2,3,4);
after execute this code the array will be
$array=array (4,3,2,1);


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Binary Search Linear Search Works only on sorted items. such as  1,2,3,4,5,6  etc
Works on sorted as well as unsorted items. 12,4,5,3,2,1 etc Very efficient if the items are sorted Very efficient if the items are less and present in the beginning of the list. such as Suppose your list items are : 12,3,4,5,1 and you want to search 12 number then you get beginning in the list. Works well with arrays and not on linked lists. Works with arrays and linked lists.
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Memory representation of Linked List Data Structures in C Language

Memory representation of Linked List

             In memory the linked list is stored in scattered cells (locations).The memory for each node is allocated dynamically means as and when required. So the Linked List can increase as per the user wish and the size is not fixed, it can vary.

               Suppose first node of linked list is allocated with an address 1008. Its graphical representation looks like the figure shown below:

      Suppose next node is allocated at an address 506, so the list becomes,

  Suppose next node is allocated with an address with an address 10,s the list become,

The other way to represent the linked list is as shown below:

 In the above representation the data stored in the linked list is “INDIA”, the information part of each node contains one character. The external pointer root points to first node’s address 1005. The link part of the node containing information I contains 1007, the address of next node. The last node …