为了增加自己的
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>
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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