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:

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:



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