set_status_header($code[, $text = ''])
log_message($level, $message)
quoted_printable_encode($str)
is_really_writable($file)
mb_strlen($str[, $encoding = NULL])
is_php($version)
hash_pbkdf2($algo, $password, $salt, $iterations[, $length = 0[, $raw_output = FALSE]])
is_cli()
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