How to remove duplicate words from string using php? -


below variable have, 

$string = 'aaa,bbb,aaa,bbb,aaa,bbb';

i need unique string result below,

$string = 'aaa,bbb,aaa,bbb';

how make unique array_unique() function , there default string function remove duplicate string in php?

i don't php have such function, can process this: live demo

$raw = 'aaa,bbb,aaa,bbb,aaa,bbb'; $string = implode(',', array_unique(explode(',', $raw)));

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