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handle_comments.php script 2nd 3rd 4th 5th
hashed values
HAVING clause
header files 2nd 3rd 4th
header() function 2nd 3rd 4th 5th 6th 7th 8th 9th
header.html file
     content management example 2nd 3rd 4th
     e-commerce example 2nd
     user registration example 2nd
headers 2nd 3rd 4th 5th 6th 7th 8th 9th
headers already sent error
headers_sent() function
HEAP tables
heredoc method
hidden form inputs 2nd 3rd 4th 5th 6th
hijacked sessions 2nd 3rd
home page
     content management example 2nd
     user registration example 2nd
hostname wildcard character (%)
hostnames
HotScripts.com
HTML
     blank pages
     comments in 2nd 3rd 4th
     debugging 2nd
     errors 2nd 3rd
     handling 2nd 3rd 4th
     problems with
     removing
     resources
     Web sites
     white space and 2nd 3rd 4th 5th
HTML email
HTML files
HTML forms
    creating [See forms]
    file uploads [See forms]
    handling [See forms]
    hidden inputs [See forms]
    method attribute [See forms]
    names [See forms]
    passwords in [See forms]
    PHP Redux [See forms]
    preventing multiple submissions [See forms]
    registration [See forms]
    sticky forms [See forms]
    validating [See forms]
    verifying submission of [See forms]
HTML pages
     blank
     home page 2nd
     multiple 2nd
     titles
     validating data 2nd 3rd 4th 5th 6th 7th
HTML source
HTML specifications
HTML tags 2nd
HTML templates 2nd 3rd 4th 5th 6th 7th 8th 9th
HTML validation applications
HTML-embedded scripting
htmlentities() function
htmlspecialchars() function 2nd
HTTP (HyperText Transfer Protocol) 2nd 3rd 4th
HTTP headers 2nd 3rd 4th 5th 6th 7th 8th 9th
HTTP_USER_AGENT variable 2nd 3rd 4th 5th 6th
HyperText Transfer Protocol [See HTTP]