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5. what are the differences between php 3 and php 4?
can i run several versions of php at the same time?

the differences described here are with respect to perl 5.005.
capturing subpatterns that occur inside negative looka - head assertions are counted, but their entries in the offsets vector are never set.

remarkable differences of the cli sapi compared to other sapi s:
from a shell, typing php -v will tell you whether php is cgi or cli.

ifx_pconnect() acts very much like ifx_connect() with two major differences.
this function behaves exactly like ifx_connect() when php is not running as an apache module.

fbsql_pconnect() acts very much like fbsql_connect() with two major differences.
fbsql_pconnect() acts very much like fbsql_connect() with two major differences.

overload resolution is in general a hard problem given the differences in types between the two languages. the php java extension employs a simple, but fairly effective, metric for determining which overload is the best match.
the php java extension employs a simple, but fairly effective, metric for determining which overload is the best match.

no two sql dialects are ever 100% compatible. when porting sql applications from other database interfaces to sesam, some adaption may be required. the following typical differences should be noted:
when allowing access to the sesam databases, the web server user should only have as little privileges as possible.

as of version 4.3.0, php supports a new sapi type (server application programming interface) named cli which means command line interface. as the name implies, this sapi type main focus is on developing shell (or desktop as well) applications with php. there are quite a few differences between the cli sapi and other sapi s which are explained in this chapter. it's worth mentioning that cli and cgi are different sapi's although they do share many of the same behaviors.
as the name implies, this sapi type main focus is on developing shell (or desktop as well) applications with php.