<code><span><span><?php</span>header(<span>"content-type:text/html;charset=utf-8"</span>);<span>$t1</span> = microtime(<span>true</span>);<span>for</span>(<span>$i</span>=<span>1</span>;<span>$i</span><<span>10000000</span>;<span>$i</span>++){}<span>$t2</span> = microtime(<span>true</span>);<span>for</span>(<span>$i</span>=<span>1</span>;<span>$i</span><<span>10000000</span>;++<span>$i</span>){}<span>$t3</span> = microtime(<span>true</span>);<span>echo</span><span>"后++消耗了=="</span>.(<span>$t2</span>-<span>$t1</span>);<span>echo</span><span>'<hr>'</span>;<span>echo</span><span>"前++消耗了=="</span>.(<span>$t3</span>-<span>$t2</span>);<span>echo</span><span>'<hr>'</span>;<span>$i</span> = <span>1</span>;<span>$i</span> = <span>$i</span>++;<span>echo</span><span>$i</span>;<span>//后++:先把值临时存储一份,执行++,再把临时存储的那份值参与运算</span><span>//前++:先执行++, 再把自加的值参与运算 </span></span></code>
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