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PHP | Different characters in the given string
  • Last Updated : 16 Mar, 2018

We have string str and we need to find the string with all unique characters from the given string. All different characters should be printed in ascending order.

Examples:

Input : $str = "GeeksforGeeks"
Output : Gefkors
Explanation, the unique characters in the given
string $str in ascending order are G, e, f, k, 
o, r and s

Input : $str = "Computer Science Portal"
Output : CPSaceilmnoprtu
Explanation, the unique characters in the given 
string $str are C, P, S, a, c, ei, l, m, n, o, 
p, r, t and u

The problem can be solved using PHP in built function for collecting all the unique characters used in the given string.The in built function used for the given problem is:

  1. count_chars():The in built function has parameter which contains return mode an integer type which are as such 0, 1, 2, 3, 4 in which return mode 3 returns the string of all different characters used in the given string in ascending order.

    Note: The string is case-sensitive.

Example 1:






<?php
// PHP code to find string containing unique 
// characters in the given string
  
$str = "Geeksforgeeks";
$result = (count_chars($str, 3));
  
echo ($result);
?>
Output:
Gefgkors

Example 2:




<?php
// PHP code to find string containing unique 
// characters  in the given string
  
$str = "GeeksforGeeks";
$result = (count_chars($str, 3));
  
echo ($result);
?>
Output:
Gefkors

Example3:




<?php
// PHP code to find string containing unique 
// characters in the given string
  
$str = "Computer Science Portal";
$result = (count_chars($str, 3));
  
echo ($result);
?>
Output:
CPSaceilmnoprtu



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