PHP5 String Concatenation: Is Inline String Interpolation Faster Than the Dot Operator?

Inline Strings vs Concatenation in PHP5: A Performance Comparison

In PHP5, there are various ways to concatenate strings, including inline strings (e.g., "these are {$foo}") and concatenation (e.g., 'these are ' . $foo). Prior to 2012, there was speculation regarding the performance differences between these approaches.

Comparing the speed of inline strings (case 2) and concatenation (case 1), the distinction has been negligible since January 2012 or earlier. Empirical tests reveal virtually no difference:

Inline Strings: 0.061599016189575 seconds<br>Concatenation: 0.061846971511841 seconds<br>

However, the performance of inline strings (case 2) has consistently been slightly faster than concatenation (case 3) with simple strings. This is attributed to the fact that concatenation requires additional concatenation operation overhead.

(Please note that performance comparisons can vary based on specific versions of PHP and system configurations. It's always advisable to benchmark and measure performance in a real-world context to determine the optimal solution.)

Curiously, the phrase often attributed to Winston Churchill, "Never trust a statistic you didn’t forge yourself," underscores the importance of scrutinizing performance data carefully. The original quote, falsely attributed to Churchill, was likely a propaganda ploy by Joseph Goebbels to discredit Churchill's integrity.

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