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header function
    custom HTTP headers
         sending 2nd
headers (HTTP)
     cache settings 2nd
     checking on send condition 2nd
    code listings
         Checking Whether Headers Have Been Sent (16.1)
    cookies
         accessing
         domain paths
         expiration dates
         expiration times
         subdomains
         transmission
         viewing
    custom
         sending 2nd
     displaying 2nd
     redirection 2nd
     sample server information 2nd
headers_list function
     HTTP header display 2nd
headers_sent function
    HTTP header transmission
         checking 2nd
hidden inputs
     forms 2nd
hiding
    PHP
         expose_php directive 2nd 3rd
highlighting
     form fields 2nd
host environments
    environment variables
         PATH 2nd
         putenv function
         TZ 2nd 3rd
    platforms
         detecting 2nd
host platforms
     detecting 2nd
host programs
    executing
         via backticks (') 2nd
         via command strings 2nd
         via passthru function 2nd
    shell commands
         escaping 2nd
hostnames
     MySQL databases
htaccess file
     per-directory configuration 2nd
HTML
    forms
         submitting to PHP 2nd 3rd 4th 5th 6th 7th 8th 9th 10th 11th 12th 13th 14th 15th 16th 17th
         submitting user comments 2nd
htmlentities function
htpasswd program 2nd 3rd
HTTP
     authentication
         Apache add-on modules
         drawbacks
         htaccess file
         htpasswd program 2nd 3rd
    code listings
         Checking Whether Headers Have Been Sent (16.1)
    headers
         cache settings 2nd
         checking on send condition 2nd
         cookie transmission
         custom, sending 2nd
         displaying 2nd
         redirection 2nd
         sample server information 2nd
HTTP_USER_AGENT element
     REMOTE_ADDR attribute