基准测试

测试脚本/strong>

<?php
$numbers = range(32, 127);
$numbersLetters = array_map('chr', $numbers);
for (;;) {
    $numbersLetters = array_merge($numbersLetters, $numbersLetters);
    if (count($numbersLetters) > 10000) {
        break;
    }
}
$numbers = range(1, count($numbersLetters));
printf("Sample size: %d elements in 2 arrays (%d total) n", count($numbers), count($numbers) + count($numbersLetters));
printf("Benchmarking speed in foreach + in_array() scenario... (this might take a while) ");
shuffle($numbers);
shuffle($numbersLetters);
$t1 = microtime(true);
foreach ($numbers as $number) {
    if (in_array($number, $numbersLetters)) {}
}
$t2 = microtime(true);
printf("DONE!n");
printf("Time elapsed: %.5f n", $t2 - $t1);
// =============================------------===============================
printf("Benchmarking speed with array_intersect...");
shuffle($numbers);
shuffle($numbersLetters);
$t1 = microtime(true);
array_intersect($numbers, $numbersLetters);
$t2 = microtime(true);
printf("DONE!n");
printf("Time elapsed: %.5f n", $t2 - $t1);

Sample size: 12288 elements in 2 arrays (24576 total) 
Benchmarking speed in foreach + in_array() scenario... (this might take a while) DONE!
Time elapsed: 3.79213 
Benchmarking speed with array_intersect...DONE!
Time elapsed: 0.05765 

小提琴:http://ideone.com/OZ2Idf