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e-mail. [See also mail]
each() function
     arrays 2nd
echo statement
echo() function
echo() statement
editing. [See changing]
editors
     accessing
     avoiding for PHP code
     HTML
Edmunds Keith
elements
     TITLE
ellipses
     ImageEllipse() function
     ImageFilledEllipse() function
else clause
     with if statements 2nd 3rd 4th
elseif clause
     with if statements 2nd 3rd 4th 5th
email field
emailChecker() function 2nd 3rd
emerg
     LogLevel directive option
enabling
     per-directory configuration files
ENCRYPT argument
encrypting
    passwords
         user management (file-based authentication)
encryption
     decryption
     keys
     SSL protocols
end tags 2nd 3rd 4th 5th
ending
     block of statements 2nd
ENUM data type
environment modifications
     internationalization
         Apache, configuration changes to 2nd
         MySQL, configuration changes to 2nd
         PHP, configuration changes to 2nd
environment variables
     access control rules
     conditional logging
equal sign (=)
     assignment operator 2nd 3rd
     equivalence operator (==)
     identical operator (===) 2nd
equal to operator
equivalence operator (==)
error
     LogLevel directive option
error log
     Apache log files
error messages
     mysql error() function 2nd
ErrorLog directive
    errors
         logging
errors
     authentication process 2nd 3rd
     logging 2nd 3rd
         files
         LogLevel directive 2nd
         programs
         syslog daemon (Unix)
    logs
         monitoring
escapeshellarg() function
escapeshellcmd() function
evaluating
     control access rules 2nd
events
     adding to calendars 2nd 3rd 4th 5th 6th 7th 8th 9th 10th 11th 12th
    recording
         error log
exclamation mark (!)
     not operator (!)
exec() function
     running commands with 2nd 3rd 4th
existence (files)
     checking 2nd
exit statement
expiration dates
     cookies 2nd
EXPLAIN command 2nd 3rd 4th 5th 6th
explode() function
     breaking strings into arrays
expressions
     defined 2nd
     subexpressions
expressions. [See also operators]
external processes
    operating systems
         scalability