php - How to create a key(like FBAppid) automatically for registration? -

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i need create auto generated key , send through mail registration process.the key should have atleast 50 characters(like facebook appid) length , must unique . using php technology , mysql data base.

i new php , need help.

for 50 chars , cryptographically safe string use. 

openssl_random_pseudo_bytes(50);

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