How string can be removed recurring characters and only stay unique chars in Php?

Question

How string can be removed recurring characters and only stay unique chars in Php? For example: this is the string xsxssssdddxxxs I need the result should be xsd

Answer 1

Maybe like this,

$str = 'aassdd';
echo implode('',array_unique(str_split($str, 1)));

Answer 2

You can do something like this:

$str = "my string that contains multiple same charactersasldjasj";
echo implode('',array_unique(str_split($str, 1)));