Check if property has been set in phing

Question

How to check if property ${foo} has been set?

Bonus question: how to escape $ sign in <echo> so I could output ${foo} string (not the foo variable substitution)?

PS: tried to google and read documentation, but couldn't find the answers. It's likely I'm missing something

Delmardelmer

Answer 1

You need to place an isset element inside the if element.

<if>
    <isset property="foo" />

The manual is available here.

Howell

or add if="variable" as attribute of the tag to run it only if the variable is set. From experience, better to avoid complex conditional statements for maintenance reasons – Ewald

The problem with both answers here is that they don't let you check if anything has been assigned to the respective properties. – Dreamworld

Answer 2

If you just need to fail the build if a property is defined or not, check out the fail task:

http://www.phing.info/docs/guide/stable/FailTask.html

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