hi guys,
I always use curly braces around vars placed in double quoted strings, I do this for 2 reasons:
1. I believe It helps the engine because the var delimitation is explicit, and this means the interpolation is (should be?) faster.
2. it looks nice (easier to read!)
I have tried to test this with a simple script that does a million interations - but I cannot get it to return consistent results - one time with curlies is faster, another its slower.
The difference happens at parse time, so if you want to measure any difference execute php script in a loop, not loop inside php script.
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