Are there any common pitfalls when running PHP 4 and PHP 5 on the same server?
One common pitfall when running PHP 4 and PHP 5 on the same server is that they may have conflicting configurations or dependencies, leading to compatibility issues. To solve this, you can use a tool like FastCGI to run PHP 4 and PHP 5 in separate processes, ensuring they do not interfere with each other.
AddHandler php4-cgi .php
Action php4-cgi /cgi-bin/php4.cgi
AddHandler php5-cgi .php
Action php5-cgi /cgi-bin/php5.cgi
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