PHP で for 文を回さないでランダムっぽい文字列を得る

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1. str_shuffle(md5(uniqid()));  
2.   
3. str_shuffle('abcdefghijklmnopqrstuvwxyz0123456789');  

str_shuffle(md5(uniqid()));

str_shuffle('abcdefghijklmnopqrstuvwxyz0123456789');