Leave one character in the php rule

Leave a $ a & nbsp; in php to exclude the same character. Hello, hello, he is good, he is good, I am good, I am good, he is good, I am good; how can I separate "," in "$ a" and remove the same ones from it? a big brother who is troublesome to know can directly give the complete code to you. hello, he is good, I am good, hi, he is. I just want to exclude one of the same php characters in green and red.

$ A = "'Hello', 'hello ', 'Hi me '";

In $ a, how does one exclude the same

Easy to understand, Big Brother, directly give the complete code

'Hi, 'hi,', 'Hi'

It is to take one of the green and red parts. sometimes three, four, and five are the same, but all of them are the same.
'Hello', 'Hello, ', 'hello ', 'Hi! ', 'Hi!', 'Hi'

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------ Solution --------------------

$ B = join (',', array_unique (explode (",", $ )));