计算php函数的执行时间

1. $long_str = "this is a test to see how much time md5 function takes to execute over this string";
3. // start timing from here
4. $start = microtime(true);
6. // function to test
7. $md5 = md5($long_str);
9. $elapsed = microtime(true) - $start;
11. echo "That took $elapsed seconds.\n";
12. ?>

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执行时间, php