php calculate program running time

The

microtime() function returns the current Unix timestamp and microseconds.

<code><span>echo</span>(microtime());
<span>0.47813000</span><span>1451273280</span></code>

microtime(true)returns a floating point number
Calculate running time code:

<code><span>$startTime</span> = microtime(<span>true</span>);
<span>$endTime</span> = microtime(<span>true</span>);
<span>$runTime</span> = (<span>$endTime</span>-<span>$startTime</span>)*<span>1000</span> . <span>' ms'</span>;</code>

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