Measuring the time of a query

I'm using PDO, is there any way, to measure how long does it 开发者_开发百科take to complete the query?

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You could use microtime(true) to get the seconds needed to execute:

$start = microtime(true);
//Your code
echo 'Time needed: ' . (microtime(true) - $start) . '.';

To get a more accurate time you should do that test more times (10000 here):

$start = microtime(true);
for ($i = 0; $i < 10000; ++$i) {
    //Your code
}
echo 'Time needed: ' . (microtime(true) - $start) . '.';

@Baz1nga, that code doesn't work, since microtime_float() isn't a function (Sorry, I can't comment, need more reputation :()

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have you tried using Micro Time to measure the time. Just surround whatever you want to measure around this piece of code and you should get the time.

$time_start = microtime_float();

// code to be measured

$time_end = microtime_float();

$timeMeasured = $time_end - $time_start;


function microtime_float()
{
    list($usec, $sec) = explode(" ", microtime());
    return ((float)$usec + (float)$sec);
}

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As Sietse said, use the microtime function to measure the elapsed microseconds.

If you're testing MySQL before the test query, execute the following query:

RESET QUERY CACHE;

Otherwise, you can't be sure if the query was really executed or was retrieved from the query cache (it can be a big difference).