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I have tried ConTEXT (free), PHP Designer 2008 (Commercial), and Eclipse (free). All were pretty nice, but I just went back to the basics with NotePad++. My second choice would be PHP Designer.
Can we conclude in the current Professional Environment of php development which is best suitable and meet all requirements and also cheapest
I think dreamcatcher has stated it best so far, hoxspeed:
Its finding the right one for you.
Whether it be a text editor or a full-blown Integrated Development Environment (IDE), it has to be something that meets your needs and programming style. Your requirements for an interface may be quite different than another programmer. Your budget and another's budget for development tools can also be quite different.
To answer a question posed by henry0 earlier, an IDE may indeed have a slightly larger learning curve as there are more components than just the editor itself. However, learning to use the editor interface of the IDE is comparable to learning how to use any other editor, in my humble opinion.
For Java, however, I like NetBeans 6.0