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PHP : Appendices : Migrating from PHP 3 to PHP 4 : PHP 3 extension

PHP 3 extension

Extensions written for PHP 3 will not work with PHP 4, neither as binaries nor at the source level. It is not difficult to port extensions to PHP 4 if you have access to the original source. A detailed description of the actual porting process is not part of this text.

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What has changed in PHP 4
Running PHP 3 and PHP 4 concurrently
Migrating Configuration Files
Parser behavior
Error reporting
Initializers
empty('0')
Missing functions
PHP 3 extension
Variable substitution in strings
Cookies
Handling of global variables

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