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分享PHP函数microtime()调用技巧

Jun 13, 2016 am 11:10 AM
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定义和用法

PHP函数microtime()返回当前 Unix 时间戳和微秒数。

PHP函数microtime()语法

microtime(get_as_float)

PHP函数microtime()参数与描述

get_as_float 如果给出了 get_as_float 参数并且其值等价于 TRUE,该函数将返回一个浮点数。

说明

PHP函数microtime()仅在支持 gettimeofday() 系统调用的操作系统下可用。

如果调用时不带可选参数,本函数以 "msec sec" 的格式返回一个字符串,其中 sec 是自 Unix 纪元(0:00:00 January 1, 1970 GMT)起到现在的秒数,msec 是微秒部分。字符串的两部分都是以秒为单位返回的。

PHP函数microtime()例子

<ol class="dp-xml">
<li class="alt"><span><span class="tag"><span> ?php  </span></span></span></li>
<li><span>echo(microtime());  </span></li>
<li class="alt">
<span class="tag">?></span><span> </span>
</li>
</ol>
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输出:

0.25139300 1138197510

PHP函数microtime()通常用法如下:

<ol class="dp-xml">
<li class="alt"><span><span class="tag"><span> ?php  </span></span></span></li>
<li>
<span>$</span><span class="attribute">mtime</span><span>=</span><span class="attribute-value">explode</span><span>(' ',microtime());</span>
</li>
<li>
<span>$</span><span class="attribute">startTime</span><span>=$mtime[1]+$mtime[0];  </span>
</li>
<li class="alt"><span>echo $startTime;  </span></li>
<li>
<span class="tag">?></span><span> </span>
</li>
</ol>
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