Inline Strings or Concatenation in PHP5: What\'s the Performance Difference?

Inline Strings vs Concatenation: Performance Differences in PHP5

When working with strings in PHP5, developers often encounter the question of whether to use inline strings or concatenation. This question arises from the potential performance differences between the two methods.

Performance Comparison of Inline Strings vs Concatenation

Case 1: Inline Strings with Double Quotes
print "these are $foo";

Case 2: Inline Strings with Curly Braces
print "these are {$foo}";

Case 3: Concatenation with '.' Operator
print 'these are ' . $foo;

Earlier PHP Versions

In earlier versions of PHP, there may have been a performance difference between inline strings and concatenation, with single quotes (Case 3) being marginally faster than double quotes (Case 1 and 2). However, this difference has become irrelevant in later versions.

PHP5 and Beyond

In PHP5 and subsequent versions, benchmark tests have consistently shown that there is virtually no performance difference between inline strings and concatenation.

Benchmark Results

Single Quotes (inline): 0.0618 seconds
Double Quotes (inline): 0.0615 seconds

Conclusion

As demonstrated by the benchmark results, the performance difference between inline strings and concatenation in PHP5 is negligible. Developers can choose whichever method they prefer based on code readability and personal style. However, it is worth noting that earlier PHP versions may exhibit slight performance differences, so it is advisable to test and optimize code accordingly.

The above is the detailed content of Inline Strings or Concatenation in PHP5: What\'s the Performance Difference?. For more information, please follow other related articles on the PHP Chinese website!