php 时间函数

时间戳

<code class="hljs ruby has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">$timestamp</span>=time();<span class="hljs-regexp" style="color: rgb(0, 136, 0); box-sizing: border-box;">//</span>拿到当前的时间戳</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li></ul>

设置时区

<code class="hljs scss has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-function" style="box-sizing: border-box;">date_default_timezone_get()</span>;<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//得到当前时区</span>
<span class="hljs-function" style="box-sizing: border-box;">date_default_timezone_set(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'PRC'</span>)</span>;<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//设置默认时区为中国</span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li></ul>

格式化时间戳

<code class="hljs mel has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">echo <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">date</span>(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'Y年m日d天 H:i:s'</span>);　<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//date返回格式化的当前时间</span>
<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">$date3</span>=<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">date</span>(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'Y-m-d H:i:s'</span>,<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"1228348800"</span>);</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li></ul>

拿到某个时间的时间戳

<code class="hljs scss has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-function" style="box-sizing: border-box;">mktime(<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>,<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>,<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>,<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">10</span>,<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">9</span>,<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">2014</span>)</span>;<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//返回2014年9月10号的时间戳</span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li></ul>

测试代码执行时间

<code class="hljs r has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">$start_time=microtime();
//<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">...</span>执行的代码
$end_time=microtime();
$execute_time=$end_time-$start_time;</code>