What is mod php

Question

While going through a Zend tutorial  I came across the following statement      Note that the php flag settings in  htaccess only work if you are using mod php    Can someone explain what that means

User · Answer

mod php is a PHP interpreter    From docs  one important catch of mod php is     mod php is not thread safe and forces you to stick with the prefork mpm  multi process  no threads   which is the slowest possible configuration

User · Answer

Your server needs to have the php modules installed so it can parse php code   If you are on ubuntu you can do this easily with   sudo apt-get install apache2  sudo apt-get install php5  sudo apt-get install libapache2-mod-php5  sudo  etc init d apache2 restart   Otherwise you may compile apache with php  http   dan drydog com apache2php html  Specifying your server OS will help others to answer more specifically

User · Answer

It means that you have to have PHP installed as a module in Apache  instead of starting it as a CGI script

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This answer is taken from TuxRadar   When running PHP through your web server  there are two distinct options  running it using PHP s CGI SAPI  or running it as a module for the web server  Each have their own benefits  but  overall  the module is generally preferred  Running PHP as a CGI means that you basically tell your web server the location of the PHP executable file  and the server runs that executable  giving it the script you called  each time you visit a page  That means each time you load a page  PHP needs to read php ini and set its settings  it needs to load all its extensions  and then it needs to start work parsing the script - there is a lot of repeated work  When you run PHP as a module  PHP literally sits inside your web server - it starts only once  loads its settings and extensions only once  and can also store information across sessions  For example  PHP accelerators rely on PHP being able to save cached data across requests  which is impossible using the CGI version  The obvious advantage of using PHP as a module is speed - you will see a big speed boost if you convert from CGI to a module  Many people  particularly Windows users  do not realise this  and carry on using the php exe CGI SAPI  which is a shame - the module is usually three to five times faster  There is one key advantage to using the CGI version  though  and that is that PHP reads its settings every time you load a page  With PHP running as a module  any changes you make in the php ini file do not kick in until you restart your web server  which makes the CGI version preferable if you are testing a lot of new settings and want to see instant responses

User · Answer

mod php means PHP  as an Apache module   Basically  when loading mod php as an Apache module  it allows Apache to interpret PHP files  those are interpreted by mod php     EDIT   There are  at least  two ways of running PHP  when working with Apache     Using CGI   a PHP process is launched by Apache  and it is that PHP process that interprets PHP code -- not Apache itself Using PHP as an Apache module  called mod php    the PHP interpreter is then kind of  embedded  inside the Apache process   there is no external PHP process -- which means that Apache and PHP can communicate better     And re-edit  after the comment   using CGI or mod php is up to you   it s only a matter of configuration of your webserver   To know which way is currently used on your server  you can check the output of phpinfo     there should be something indicating whether PHP is running via mod php  or mod php5   or via CGI   You might also want to take a look at the php sapi name   function   it returns the type of interface between web server and PHP    If you check in your Apache s configuration files  when using mod php  there should be a LoadModule line looking like this    LoadModule php5 module        modules libphp5 so    The file name  on the right  can be different -- on Windows  for example  it should be a  dll

User · Answer

Just to add on these answers is that  mod php is the oldest and slowest method available in HTTPD server to use PHP  It is not recommended  unless you are running old versions of Apache HTTPD and PHP  php-fpm and proxy cgi are the preferred methods

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