Supporting the smooth shift from legacy components to SOA-enabled (Service Oriented Architecture) ones in enterprise architecture is a key requirement for wide-SOA adoption. An SOA structures large applications into reusable building blocks called “services” that respond rapidly to changing business conditions. For an enterprise, in order benefiting from SOA, they first need to transform their enterprise architecture so that it is at least partially SOA-enabled. However, it is often the case with enterprise that they also hate to dispose their current IT systems so drastically. In such situation, reusing legacy components rather than re-implementing them from scratch for provided SOA-enabled components is a preferred approach to SOA adoption for an enterprise in the real world.
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Here is a fairly nice summary of recent PHP compilation technolgoies. PHP compilers shootout
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