获取每个月的第一个星期的日期代码,PHP代码库,德仔网

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【PHP】获取每个月的第一个星期的日期
作者:Dezai.CN / 发布于2011/6/11/ 461
<div><span style="font-style: italic; color: rgb(128,128,128)">/**
* This function calculates the first [WEEKDAY] of a month.
* The day to find is passed as an integer to the function.
* 
* To use: Pass the month, year and day (as an integer 0-6) to the function.
*
* @param int $month
* @param int $year
* @param int $day [0 = sunday, 1 = monday, 2 = tuesday, 3 = wednesday, 4 = thursday, 5 = friday, 6 = saturday]
* @return date
*/</span>
<span style="color: rgb(0,0,0); font-weight: bold">function</span> getFirstDay<span style="color: rgb(102,204,102)">(</span><span style="color: rgb(0,0,255)">$month</span>,<span style="color: rgb(0,0,255)">$year</span>,<span style="color: rgb(0,0,255)">$day</span><span style="color: rgb(102,204,102)">)</span><span style="color: rgb(102,204,102)">{</span>

<span style="color: rgb(0,0,255)">$num</span> = <a href="http://www.php.net/date" target="_blank"><span style="color: rgb(0,0,102)">date</span></a><span style="color: rgb(102,204,102)">(</span><span style="color: rgb(255,0,0)">"w"</span>,<a href="http://www.php.net/mktime" target="_blank"><span style="color: rgb(0,0,102)">mktime</span></a><span style="color: rgb(102,204,102)">(</span><span style="color: rgb(204,102,204)">0</span>,<span style="color: rgb(204,102,204)">0</span>,<span style="color: rgb(204,102,204)">0</span>,<span style="color: rgb(0,0,255)">$month</span>,<span style="color: rgb(204,102,204)">1</span>,<span style="color: rgb(0,0,255)">$year</span><span style="color: rgb(102,204,102)">)</span><span style="color: rgb(102,204,102)">)</span>;
<span style="color: rgb(177,177,0)">if</span><span style="color: rgb(102,204,102)">(</span><span style="color: rgb(0,0,255)">$num</span>==<span style="color: rgb(0,0,255)">$day</span><span style="color: rgb(102,204,102)">)</span> <span style="color: rgb(102,204,102)">{</span>
<span style="color: rgb(177,177,0)">return</span> <a href="http://www.php.net/date" target="_blank"><span style="color: rgb(0,0,102)">date</span></a><span style="color: rgb(102,204,102)">(</span><span style="color: rgb(255,0,0)">"Y-m-d H:i:s"</span>,<a href="http://www.php.net/mktime" target="_blank"><span style="color: rgb(0,0,102)">mktime</span></a><span style="color: rgb(102,204,102)">(</span><span style="color: rgb(204,102,204)">0</span>,<span style="color: rgb(204,102,204)">0</span>,<span style="color: rgb(204,102,204)">0</span>,<span style="color: rgb(0,0,255)">$month</span>,<span style="color: rgb(204,102,204)">1</span>,<span style="color: rgb(0,0,255)">$year</span><span style="color: rgb(102,204,102)">)</span><span style="color: rgb(102,204,102)">)</span>;
<span style="color: rgb(102,204,102)">}</span>
<span style="color: rgb(177,177,0)">elseif</span><span style="color: rgb(102,204,102)">(</span><span style="color: rgb(0,0,255)">$num</span>><span style="color: rgb(0,0,255)">$day</span><span style="color: rgb(102,204,102)">)</span> <span style="color: rgb(102,204,102)">{</span>
<span style="color: rgb(177,177,0)">return</span> <a href="http://www.php.net/date" target="_blank"><span style="color: rgb(0,0,102)">date</span></a><span style="color: rgb(102,204,102)">(</span><span style="color: rgb(255,0,0)">"Y-m-d H:i:s"</span>,<a href="http://www.php.net/mktime" target="_blank"><span style="color: rgb(0,0,102)">mktime</span></a><span style="color: rgb(102,204,102)">(</span><span style="color: rgb(204,102,204)">0</span>,<span style="color: rgb(204,102,204)">0</span>,<span style="color: rgb(204,102,204)">0</span>,<span style="color: rgb(0,0,255)">$month</span>,<span style="color: rgb(204,102,204)">1</span>,<span style="color: rgb(0,0,255)">$year</span><span style="color: rgb(102,204,102)">)</span>+<span style="color: rgb(102,204,102)">(</span><span style="color: rgb(204,102,204)">86400</span>*<span style="color: rgb(102,204,102)">(</span><span style="color: rgb(102,204,102)">(</span><span style="color: rgb(204,102,204)">7</span>+<span style="color: rgb(0,0,255)">$day</span><span style="color: rgb(102,204,102)">)</span>-<span style="color: rgb(0,0,255)">$num</span><span style="color: rgb(102,204,102)">)</span><span style="color: rgb(102,204,102)">)</span><span style="color: rgb(102,204,102)">)</span>;
<span style="color: rgb(102,204,102)">}</span>
<span style="color: rgb(177,177,0)">else</span> <span style="color: rgb(102,204,102)">{</span>
<span style="color: rgb(177,177,0)">return</span> <a href="http://www.php.net/date" target="_blank"><span style="color: rgb(0,0,102)">date</span></a><span style="color: rgb(102,204,102)">(</span><span style="color: rgb(255,0,0)">"Y-m-d H:i:s"</span>,<a href="http://www.php.net/mktime" target="_blank"><span style="color: rgb(0,0,102)">mktime</span></a><span style="color: rgb(102,204,102)">(</span><span style="color: rgb(204,102,204)">0</span>,<span style="color: rgb(204,102,204)">0</span>,<span style="color: rgb(204,102,204)">0</span>,<span style="color: rgb(0,0,255)">$month</span>,<span style="color: rgb(204,102,204)">1</span>,<span style="color: rgb(0,0,255)">$year</span><span style="color: rgb(102,204,102)">)</span>+<span style="color: rgb(102,204,102)">(</span><span style="color: rgb(204,102,204)">86400</span>*<span style="color: rgb(102,204,102)">(</span><span style="color: rgb(0,0,255)">$day</span>-<span style="color: rgb(0,0,255)">$num</span><span style="color: rgb(102,204,102)">)</span><span style="color: rgb(102,204,102)">)</span><span style="color: rgb(102,204,102)">)</span>;
<span style="color: rgb(102,204,102)">}</span>

<span style="color: rgb(102,204,102)">}</span>

<span style="font-style: italic; color: rgb(128,128,128)">// Example of use:</span>
<span style="color: rgb(0,0,255)">$sunday</span> = getFirstDay<span style="color: rgb(102,204,102)">(</span><span style="color: rgb(255,0,0)">'1'</span>,<span style="color: rgb(255,0,0)">'2009'</span>,<span style="color: rgb(204,102,204)">0</span><span style="color: rgb(102,204,102)">)</span>; <span style="font-style: italic; color: rgb(128,128,128)">// Sunday</span>
<span style="color: rgb(0,0,255)">$monday</span> = getFirstDay<span style="color: rgb(102,204,102)">(</span><span style="color: rgb(255,0,0)">'1'</span>,<span style="color: rgb(255,0,0)">'2009'</span>,<span style="color: rgb(204,102,204)">1</span><span style="color: rgb(102,204,102)">)</span>; <span style="font-style: italic; color: rgb(128,128,128)">// Monday</span>
<span style="color: rgb(0,0,255)">$tuesday</span> = getFirstDay<span style="color: rgb(102,204,102)">(</span><span style="color: rgb(255,0,0)">'1'</span>,<span style="color: rgb(255,0,0)">'2009'</span>,<span style="color: rgb(204,102,204)">2</span><span style="color: rgb(102,204,102)">)</span>; <span style="font-style: italic; color: rgb(128,128,128)">// Tuesday</span>
<span style="color: rgb(0,0,255)">$wednesday</span> = getFirstDay<span style="color: rgb(102,204,102)">(</span><span style="color: rgb(255,0,0)">'1'</span>,<span style="color: rgb(255,0,0)">'2009'</span>,<span style="color: rgb(204,102,204)">3</span><span style="color: rgb(102,204,102)">)</span>; <span style="font-style: italic; color: rgb(128,128,128)">// Wednesday</span>
<span style="color: rgb(0,0,255)">$thursday</span> = getFirstDay<span style="color: rgb(102,204,102)">(</span><span style="color: rgb(255,0,0)">'1'</span>,<span style="color: rgb(255,0,0)">'2009'</span>,<span style="color: rgb(204,102,204)">4</span><span style="color: rgb(102,204,102)">)</span>; <span style="font-style: italic; color: rgb(128,128,128)">// Thursday</span>
<span style="color: rgb(0,0,255)">$friday</span> = getFirstDay<span style="color: rgb(102,204,102)">(</span><span style="color: rgb(255,0,0)">'1'</span>,<span style="color: rgb(255,0,0)">'2009'</span>,<span style="color: rgb(204,102,204)">5</span><span style="color: rgb(102,204,102)">)</span>; <span style="font-style: italic; color: rgb(128,128,128)">// Friday</span>
<span style="color: rgb(0,0,255)">$saturday</span> = getFirstDay<span style="color: rgb(102,204,102)">(</span><span style="color: rgb(255,0,0)">'1'</span>,<span style="color: rgb(255,0,0)">'2009'</span>,<span style="color: rgb(204,102,204)">6</span><span style="color: rgb(102,204,102)">)</span>; <span style="font-style: italic; color: rgb(128,128,128)">// Saturday</span>

<a href="http://www.php.net/echo" target="_blank"><span style="color: rgb(0,0,102)">echo</span></a> <span style="color: rgb(255,0,0)">"First Sunday: "</span> . <span style="color: rgb(0,0,255)">$sunday</span> . <span style="color: rgb(255,0,0)">""</span>;
<a href="http://www.php.net/echo" target="_blank"><span style="color: rgb(0,0,102)">echo</span></a> <span style="color: rgb(255,0,0)">"First Monday: "</span> . <span style="color: rgb(0,0,255)">$monday</span> . <span style="color: rgb(255,0,0)">""</span>;
<a href="http://www.php.net/echo" target="_blank"><span style="color: rgb(0,0,102)">echo</span></a> <span style="color: rgb(255,0,0)">"First Tuesday: "</span> . <span style="color: rgb(0,0,255)">$tuesday</span> . <span style="color: rgb(255,0,0)">""</span>;
<a href="http://www.php.net/echo" target="_blank"><span style="color: rgb(0,0,102)">echo</span></a> <span style="color: rgb(255,0,0)">"First Wednesday: "</span> . <span style="color: rgb(0,0,255)">$wednesday</span> . <span style="color: rgb(255,0,0)">""</span>;
<a href="http://www.php.net/echo" target="_blank"><span style="color: rgb(0,0,102)">echo</span></a> <span style="color: rgb(255,0,0)">"First Thursday: "</span> . <span style="color: rgb(0,0,255)">$thursday</span> . <span style="color: rgb(255,0,0)">""</span>;
<a href="http://www.php.net/echo" target="_blank"><span style="color: rgb(0,0,102)">echo</span></a> <span style="color: rgb(255,0,0)">"First Friday: "</span> . <span style="color: rgb(0,0,255)">$friday</span> . <span style="color: rgb(255,0,0)">""</span>;
<a href="http://www.php.net/echo" target="_blank"><span style="color: rgb(0,0,102)">echo</span></a> <span style="color: rgb(255,0,0)">"First Saturday: "</span> . <span style="color: rgb(0,0,255)">$saturday</span> . <span style="color: rgb(255,0,0)">""</span>;
</div>
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