PHP Script to remove repeated characters from a string!

In this post, we are going to see how to write a small piece of PHP snippet to remove all duplicate characters in a string.

This can be achieved with the help of an inbuilt PHP function count_chars()

Let’s see a simple example:

<?php 

$str = "AABBCCCCCCCCDEEEEFFFFGGGG";
$out = count_chars($str, 3);

print $out;

?>

<?php

$str = "AABBCCCCCCCCDEEEEFFFFGGGG";

$out = count_chars($str, 3);

print $out;

Basically, the second parameter in the count_chars() function tells the PHP to remove the duplicate characters from a string.

There are few other options as well

0 – an array with the byte-value as key and the frequency of every byte as value.
1 – same as 0 but only byte-values with a frequency greater than zero are listed.
2 – same as 0 but only byte-values with a frequency equal to zero are listed.
3 – a string containing all unique characters is returned.
4 – a string containing all not used characters is returned.

You can refer here for more details: http://php.net/manual/en/function.count-chars.php

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