performance - Most efficient php if structure -

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What runs fast?

Setting a default value and changing it - 

 $ Foo = ""; If ($ bar) {$ foo = "someValue"; }

or - 

 if ($ bar) {$ foo = "someValue"; } And {$ foo = ""; }

You should not be disturbed by the performance of a single if statement.

Also, consider: 

  $ foo = $ bar? "": "Some value"

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