Re: Conditional package dependencies?

Mark Wiesemann wrote: > Hi, > > we like to publish a new DataSource driver for Structures_DataGrid soon. > This new driver will combine the current DBQuery and MDB2 drivers (which > will be marked as deprecated then), and add additional support for PDO. > > Because of the usage of a try/catch block around the PDO constructor, we > need to require PHP 5 for the new driver, while Structures_DataGrid > itself remains PHP 4 compatible. > > The problem now is that we want to make the new SQLQuery driver the > default driver for PHP 5 users if a SQL query is passed to the bind() > method. This modified auto-detection would require that our users have > the new SQLQuery driver installed; otherwise backwards compatibility > would be broken. > > To keep it short: Is there a way to define a conditional dependency that > requires the new driver if PHP 5 is used, and that defines only an > optional dependency if PHP 4 is used? > > Other suggestions on this problem are also welcome, of course. Hi, There is one possibility that may be a bit onerous. Basically, your only hope is to take advantage of the new pre-download PHP dependency resolution in PEAR 1.6.0. What you could do is have the 1.0.x versions of SQLQuery driver simply be a wrapper for the default php 4 driver, and 1.1.x versions of SQLQuery driver be the php 5 driver. However, for this to work, you'd need the API to be BC between 1.1.x and 1.0.x. If the php4/php5 machinations are all under the hood, this solution would actually work and satisfy PEAR's API BC requirements Greg