PHP array syntext

hey guys the below syntex kidda confuses me , please check it out :

[code=html] $data = array(
“username” => “‘$this->username'”,
“password” => “‘$this->hashedPassword'”,
“email” => “‘$this->email'”,
“join_date” => “‘”.date(“Y-m-d H:i:s”,time()).”‘”
);[/code]

why the additional ‘ ‘ for all lines ?

eg .

“username” => “‘$this->username'”,

why not “$this->username” ???

instead of “‘$this->username'” .

Thanks .

Gautam.

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