Are there performance differences between using commas and periods for concatenation in PHP echo statements?

Using commas for concatenation in PHP echo statements can be slightly faster than using periods because commas are a language construct while periods are a function. However, the performance difference is usually negligible and the choice between commas and periods should be based on readability and personal preference.

// Using commas for concatenation
echo "Hello", "World";

// Using periods for concatenation
echo "Hello" . "World";