Title: PHP4 to PHP5
Last modified: August 18, 2016

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# PHP4 to PHP5

 *  [primexx](https://wordpress.org/support/users/primexx/)
 * (@primexx)
 * [19 years, 10 months ago](https://wordpress.org/support/topic/php4-to-php5/)
 * I’m contemplating moving from PHP 4 to PHP 5 with my host. I have 2 questions:
 * 1. Does WordPress work well on PHP 5?
    2. Would the move affect my installation,
   since I installed it using PHP 4. The SQL database stays the same, and the SQL
   version stays the same too.
 * Thanks!

Viewing 5 replies - 1 through 5 (of 5 total)

 *  [viper007bond](https://wordpress.org/support/users/viper007bond/)
 * (@viper007bond)
 * [19 years, 10 months ago](https://wordpress.org/support/topic/php4-to-php5/#post-421701)
 * > 1. Does WordPress work well on PHP 5?
 * Of course! PHP5 is non-beta, so WordPress developers have made sure to eliminate
   any things that would not work in PHP5 (I’m not sure if there were even any to
   begin with).
 * > 2. Would the move affect my installation, since I installed it using PHP 4.
 * Not at all, nor would upgrading your MySQL version. I did both on my local test
   machine and none of my multiple WordPress installs encountered any issues.
 *  Thread Starter [primexx](https://wordpress.org/support/users/primexx/)
 * (@primexx)
 * [19 years, 10 months ago](https://wordpress.org/support/topic/php4-to-php5/#post-421702)
 * Thanks! And also thanks for the quick reply!
 *  [viper007bond](https://wordpress.org/support/users/viper007bond/)
 * (@viper007bond)
 * [19 years, 10 months ago](https://wordpress.org/support/topic/php4-to-php5/#post-421720)
 * Not a problem. 🙂
 *  Thread Starter [primexx](https://wordpress.org/support/users/primexx/)
 * (@primexx)
 * [19 years, 10 months ago](https://wordpress.org/support/topic/php4-to-php5/#post-421961)
 * Hey, I just found out that my host has a server with both PHP 5 and MySQL 5. 
   Would moving to that server effect my installation? Would I need to do any upgrade
   procedures? Thanks!
 * PS: I made a new topic about it ([http://wordpress.org/support/topic/80100](http://wordpress.org/support/topic/80100)),
   it doesnt matter which one you reply in. Thx.
 *  [don6698](https://wordpress.org/support/users/don6698/)
 * (@don6698)
 * [19 years ago](https://wordpress.org/support/topic/php4-to-php5/#post-422249)
 * Hi, All,
 * I’m looking at installing WordPress 2.2 RC2. It is apparently optimized for PHP
   5. Problem is, on my host a file with the extension “php” runs on PHP 4. To run
   PHP5 I need to use the extension “php5” (or to use PHP 3 I use the extension “
   php3”).
 * So, would i need to rename all references in all the files to include “somefile.
   php” to “somefile.php5”? Has someone already created a version that uses the “
   php5” extension in file names and within the files?
 * Don’t know how many people this affects. I have my blog on 1and1.com.
 * Thanks!
 * Warmly,
 * Don 🙂

Viewing 5 replies - 1 through 5 (of 5 total)

The topic ‘PHP4 to PHP5’ is closed to new replies.

## Tags

 * [php5](https://wordpress.org/support/topic-tag/php5/)

 * In: [Installing WordPress](https://wordpress.org/support/forum/installation/)
 * 5 replies
 * 3 participants
 * Last reply from: [don6698](https://wordpress.org/support/users/don6698/)
 * Last activity: [19 years ago](https://wordpress.org/support/topic/php4-to-php5/#post-422249)
 * Status: not resolved

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