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ucwords( ) 
unencrypted passwords, avoid using 
Unix, installing PHP interpreter on 
unset( )  2nd 
UPDATE command 
    using wildcards with 
Upgrading to PHP 5  2nd  3rd 
upload_max_filesize configuration directive  2nd  3rd 
URLs
    reading remote files 
    writing remote files 
usage statistics for PHP 
users
    accounts and file permissions 
    identifying before logging in 
    logging out 
    names of, retrieving from database 

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