NamespacedConstantsLookupBench.php

NamespacedConstantsLookupBench.php

<?php

namespace {

    \define( 'A', 'a' );
    \define( 'B', 'b' );
}

namespace foo {

    const B = 'foob';
    const C = 'c';

    /**
     * @Revs(10000)
     * @Iterations(100)
     */
    class NamespacedConstantsLookupBench {
        public function benchGlobalConstant() {
            $x = A;
        }

        public function benchFQGlobalConstant() {
            $x = \A;
        }

        public function benchNamespacedConstant() {
            $x = C;
        }

        public function benchOverriddenConstant() {
            $x = B;
        }
    }
}

results.txt

\foo\NamespacedConstantsLookupBench

    benchGlobalConstant           I99 P0 	[μ Mo]/r: 1.376 1.302 (μs) 	[μSD μRSD]/r: 0.128μs 9.27%
    benchFQGlobalConstant         I99 P0 	[μ Mo]/r: 1.390 1.311 (μs) 	[μSD μRSD]/r: 0.134μs 9.61%
    benchNamespacedConstant       I99 P0 	[μ Mo]/r: 1.375 1.313 (μs) 	[μSD μRSD]/r: 0.132μs 9.62%
    benchOverriddenConstant       I99 P0 	[μ Mo]/r: 1.398 1.310 (μs) 	[μSD μRSD]/r: 0.128μs 9.16%

4 subjects, 400 iterations, 40,000 revs, 0 rejects
(best [mean mode] worst) = 1.214 [1.385 1.309] 1.777 (μs)
⅀T: 553.963μs μSD/r 0.130μs μRSD/r: 9.414%
suite: 133ef546c39585be615f34795118cf6deec8d895, date: 2018-08-20, stime: 05:34:57
+--------------------------------+-------------------------+--------+--------+-------+-----+----------+---------+---------+---------+---------+---------+--------+--------+
| benchmark                      | subject                 | groups | params | revs  | its | mem_peak | best    | mean    | mode    | worst   | stdev   | rstdev | diff   |
+--------------------------------+-------------------------+--------+--------+-------+-----+----------+---------+---------+---------+---------+---------+--------+--------+
| NamespacedConstantsLookupBench | benchGlobalConstant     |        | []     | 10000 | 100 | 464,280b | 1.215μs | 1.376μs | 1.302μs | 1.813μs | 0.128μs | 9.27%  | +0.07% |
| NamespacedConstantsLookupBench | benchFQGlobalConstant   |        | []     | 10000 | 100 | 464,280b | 1.226μs | 1.390μs | 1.311μs | 1.777μs | 0.134μs | 9.61%  | +1.04% |
| NamespacedConstantsLookupBench | benchNamespacedConstant |        | []     | 10000 | 100 | 464,280b | 1.214μs | 1.375μs | 1.313μs | 2.088μs | 0.132μs | 9.62%  | 0.00%  |
| NamespacedConstantsLookupBench | benchOverriddenConstant |        | []     | 10000 | 100 | 464,280b | 1.234μs | 1.398μs | 1.310μs | 1.787μs | 0.128μs | 9.16%  | +1.68% |
+--------------------------------+-------------------------+--------+--------+-------+-----+----------+---------+---------+---------+---------+---------+--------+--------+