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Last updated: Tue, 09 Jul 2002
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Chapitre 55. Migrating from PHP 3 to PHP 4

PHP has already a long history behind him : Legendary PHP 1.0, PHP/FI, PHP 3.0 and PHP 4.0.

1. Migrating from PHP3 to PHP4
2. Incompatible functions?

1. Migrating from PHP3 to PHP4

PHP 4 was designed to be as compatible with earlier versions of PHP as possible and very little functionality was broken in the process. If you're really unsure about compatibility you should install PHP 4 in a test environment and run your scripts there.

Also see the appropriate migration appendix of this manual.

2. Incompatible functions?

Since PHP 4 is basically a rewrite of the entire PHP engine there was very few functions that were altered and only then some of the more exotic ones.

User Contributed Notes
Migrating from PHP 3 to PHP 4		 add a note about notes
[email protected]
03-Sep-2001 12:22
[Ed Note:
You may also modify the AddType directives in httpd.conf rather than edit mime.types, which will accomplish the same thing:

AddType application/x-httpd-php .php .phtml .php3

[email protected]]
To use .php3 files with PHP4 in (at least) Apache edit your mime.types and comment out the php3 mime types and add php3 to the line reading:

application/x-httpd-php phtml pht php

So it will read:

application/x-httpd-php phtml pht php php3

Restart Apache to be sure it picks up the new settings.
add a note about notes
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Last updated: Tue, 09 Jul 2002
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