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	<title>Chris Kankiewicz &#187; PHX2600</title>
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	<lastBuildDate>Sun, 01 Aug 2010 06:50:03 +0000</lastBuildDate>
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		<title>Calculate the first Friday of next month with PHP</title>
		<link>http://www.chriskankiewicz.com/posts/2008/10/20/calculate-the-first-friday-of-next-month-with-php/</link>
		<comments>http://www.chriskankiewicz.com/posts/2008/10/20/calculate-the-first-friday-of-next-month-with-php/#comments</comments>
		<pubDate>Tue, 21 Oct 2008 05:50:40 +0000</pubDate>
		<dc:creator>Chris Kankiewicz</dc:creator>
				<category><![CDATA[Programming]]></category>
		<category><![CDATA[Scripting]]></category>
		<category><![CDATA[Web Development]]></category>
		<category><![CDATA[Code]]></category>
		<category><![CDATA[First Friday]]></category>
		<category><![CDATA[PHP]]></category>
		<category><![CDATA[PHX2600]]></category>

		<guid isPermaLink="false">http://www.web-geek.net/?p=597</guid>
		<description><![CDATA[UPDATE: This script has been updated, see: http://www.web-geek.net/posts/2009/02/14/first-friday-script-updated-and-simplified/ While developing phx2600.org, I ran into a slight dilemma.  The PHX2600 meetings occur once a month on the first Friday of every month, and we wanted to display that on the site.  However, it was becoming a tedious chore to change the date once a month manually.  [...]]]></description>
			<content:encoded><![CDATA[<p><strong>UPDATE:</strong> This script has been updated, see: <a href="http://www.web-geek.net/posts/2009/02/14/first-friday-script-updated-and-simplified/">http://www.web-geek.net/posts/2009/02/14/first-friday-script-updated-and-simplified/</a></p>
<p>While developing <a title="PHX2600 - Phoenix, Arizona Netowrk of Hackers" href="http://www.phx2600.org" target="_blank">phx2600.org</a>, I ran into a slight dilemma.  The PHX2600 meetings occur once a month on the first Friday of every month, and we wanted to display that on the site.  However, it was becoming a tedious chore to change the date once a month manually.  So, being the automation addict I am, I thought, why not write a script.  So one night I hammered out the following script that will calculate the first Friday of next month:</p>
<p><span id="more-597"></span></p>

<div class="wp_syntax"><div class="code"><pre class="php" style="font-family:monospace;"><span style="color: #000000; font-weight: bold;">&lt;?php</span>
&nbsp;
  <span style="color: #666666; font-style: italic;">/***************************************
  *  FILENAME: first-friday.php          *
  *  AUTHOR:   Chris Kankiewicz [PHLAK]  *
  *  WEBSITE:  http://www.web-geek.net   *
  ***************************************/</span>
&nbsp;
  <span style="color: #666666; font-style: italic;">// START FUNCTIONS</span>
&nbsp;
  <span style="color: #000000; font-weight: bold;">function</span> get_day<span style="color: #009900;">&#40;</span><span style="color: #000088;">$describer</span><span style="color: #339933;">,</span><span style="color: #000088;">$weekday</span><span style="color: #339933;">,</span><span style="color: #000088;">$reference_date</span><span style="color: #009900;">&#41;</span> <span style="color: #009900;">&#123;</span> <span style="color: #666666; font-style: italic;">// $reference_date format = m-Y</span>
&nbsp;
    <span style="color: #000088;">$d</span> <span style="color: #339933;">=</span> <span style="color: #990000;">explode</span><span style="color: #009900;">&#40;</span><span style="color: #0000ff;">'-'</span><span style="color: #339933;">,</span><span style="color: #000088;">$reference_date</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
&nbsp;
    <span style="color: #b1b100;">switch</span> <span style="color: #009900;">&#40;</span><span style="color: #000088;">$describer</span><span style="color: #009900;">&#41;</span> <span style="color: #009900;">&#123;</span>
      <span style="color: #b1b100;">case</span> <span style="color: #0000ff;">'first'</span><span style="color: #339933;">:</span> <span style="color: #000088;">$offset</span> <span style="color: #339933;">=</span> get_day_offset<span style="color: #009900;">&#40;</span><span style="color: #000088;">$reference_date</span><span style="color: #339933;">,</span><span style="color: #000088;">$weekday</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span> <span style="color: #b1b100;">break</span><span style="color: #339933;">;</span>
    <span style="color: #009900;">&#125;</span>
&nbsp;
    <span style="color: #000088;">$r</span> <span style="color: #339933;">=</span> <span style="color: #990000;">mktime</span><span style="color: #009900;">&#40;</span><span style="color: #cc66cc;">0</span><span style="color: #339933;">,</span><span style="color: #cc66cc;">0</span><span style="color: #339933;">,</span><span style="color: #cc66cc;">0</span><span style="color: #339933;">,</span><span style="color: #000088;">$d</span><span style="color: #009900;">&#91;</span><span style="color: #cc66cc;">0</span><span style="color: #009900;">&#93;</span><span style="color: #339933;">,</span><span style="color: #cc66cc;">1</span><span style="color: #339933;">+</span><span style="color: #000088;">$offset</span><span style="color: #339933;">,</span><span style="color: #000088;">$d</span><span style="color: #009900;">&#91;</span><span style="color: #cc66cc;">1</span><span style="color: #009900;">&#93;</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
    <span style="color: #b1b100;">return</span> <span style="color: #000088;">$r</span><span style="color: #339933;">;</span>  <span style="color: #666666; font-style: italic;">//returns timestamp format</span>
  <span style="color: #009900;">&#125;</span>
&nbsp;
  <span style="color: #000000; font-weight: bold;">function</span> get_day_offset<span style="color: #009900;">&#40;</span><span style="color: #000088;">$anchor</span><span style="color: #339933;">,</span><span style="color: #000088;">$target</span><span style="color: #009900;">&#41;</span> <span style="color: #009900;">&#123;</span> <span style="color: #666666; font-style: italic;">//$anchor format = m-Y</span>
&nbsp;
    <span style="color: #000088;">$ts</span> <span style="color: #339933;">=</span> <span style="color: #990000;">explode</span><span style="color: #009900;">&#40;</span><span style="color: #0000ff;">'-'</span><span style="color: #339933;">,</span><span style="color: #000088;">$anchor</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
    <span style="color: #000088;">$ts</span> <span style="color: #339933;">=</span> <span style="color: #990000;">mktime</span><span style="color: #009900;">&#40;</span><span style="color: #cc66cc;">0</span><span style="color: #339933;">,</span><span style="color: #cc66cc;">0</span><span style="color: #339933;">,</span><span style="color: #cc66cc;">0</span><span style="color: #339933;">,</span><span style="color: #000088;">$ts</span><span style="color: #009900;">&#91;</span><span style="color: #cc66cc;">0</span><span style="color: #009900;">&#93;</span><span style="color: #339933;">,</span><span style="color: #0000ff;">'01'</span><span style="color: #339933;">,</span><span style="color: #000088;">$ts</span><span style="color: #009900;">&#91;</span><span style="color: #cc66cc;">1</span><span style="color: #009900;">&#93;</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
&nbsp;
    <span style="color: #000088;">$anchor</span> <span style="color: #339933;">=</span> <span style="color: #990000;">date</span><span style="color: #009900;">&#40;</span><span style="color: #0000ff;">&quot;w&quot;</span><span style="color: #339933;">,</span><span style="color: #000088;">$ts</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
    <span style="color: #000088;">$target</span> <span style="color: #339933;">=</span> <span style="color: #990000;">strtolower</span><span style="color: #009900;">&#40;</span><span style="color: #000088;">$target</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
    <span style="color: #000088;">$days</span> <span style="color: #339933;">=</span> <span style="color: #990000;">array</span><span style="color: #009900;">&#40;</span>
      <span style="color: #0000ff;">'sunday'</span><span style="color: #339933;">=&gt;</span><span style="color: #cc66cc;">0</span><span style="color: #339933;">,</span>
      <span style="color: #0000ff;">'monday'</span><span style="color: #339933;">=&gt;</span><span style="color: #cc66cc;">1</span><span style="color: #339933;">,</span>
      <span style="color: #0000ff;">'tuesday'</span><span style="color: #339933;">=&gt;</span><span style="color: #cc66cc;">2</span><span style="color: #339933;">,</span>
      <span style="color: #0000ff;">'wednesday'</span><span style="color: #339933;">=&gt;</span><span style="color: #cc66cc;">3</span><span style="color: #339933;">,</span>
      <span style="color: #0000ff;">'thursday'</span><span style="color: #339933;">=&gt;</span><span style="color: #cc66cc;">4</span><span style="color: #339933;">,</span>
      <span style="color: #0000ff;">'friday'</span><span style="color: #339933;">=&gt;</span><span style="color: #cc66cc;">5</span><span style="color: #339933;">,</span>
      <span style="color: #0000ff;">'saturday'</span><span style="color: #339933;">=&gt;</span><span style="color: #cc66cc;">6</span>
    <span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
&nbsp;
    <span style="color: #000088;">$offset</span> <span style="color: #339933;">=</span> <span style="color: #000088;">$days</span><span style="color: #009900;">&#91;</span><span style="color: #000088;">$target</span><span style="color: #009900;">&#93;</span> <span style="color: #339933;">-</span> <span style="color: #000088;">$anchor</span><span style="color: #339933;">;</span>
&nbsp;
    <span style="color: #b1b100;">if</span> <span style="color: #009900;">&#40;</span><span style="color: #000088;">$offset</span><span style="color: #339933;">&lt;</span><span style="color: #cc66cc;">0</span><span style="color: #009900;">&#41;</span> <span style="color: #000088;">$offset</span><span style="color: #339933;">+=</span><span style="color: #cc66cc;">7</span><span style="color: #339933;">;</span>
&nbsp;
    <span style="color: #b1b100;">return</span> <span style="color: #000088;">$offset</span><span style="color: #339933;">;</span>  <span style="color: #666666; font-style: italic;">//returns 0-6 for use in get_day();</span>
  <span style="color: #009900;">&#125;</span>
&nbsp;
  <span style="color: #666666; font-style: italic;">//END FUNCTIONS</span>
&nbsp;
  <span style="color: #000088;">$t</span> <span style="color: #339933;">=</span> <span style="color: #990000;">getdate</span><span style="color: #009900;">&#40;</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span> <span style="color: #666666; font-style: italic;">//Get today's date</span>
&nbsp;
  <span style="color: #000088;">$today</span> <span style="color: #339933;">=</span> <span style="color: #990000;">date</span><span style="color: #009900;">&#40;</span><span style="color: #0000ff;">'m-Y'</span><span style="color: #339933;">,</span><span style="color: #000088;">$t</span><span style="color: #009900;">&#91;</span><span style="color: #cc66cc;">0</span><span style="color: #009900;">&#93;</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span> <span style="color: #666666; font-style: italic;">//Display today's date as MM-YYYY</span>
&nbsp;
  <span style="color: #666666; font-style: italic;">//Calculate Next Month</span>
  <span style="color: #b1b100;">if</span><span style="color: #009900;">&#40;</span><span style="color: #000088;">$t</span><span style="color: #009900;">&#91;</span>mon<span style="color: #009900;">&#93;</span> <span style="color: #339933;">==</span> <span style="color: #0000ff;">'12'</span><span style="color: #009900;">&#41;</span><span style="color: #009900;">&#123;</span>
    <span style="color: #000088;">$nm</span> <span style="color: #339933;">=</span> <span style="color: #0000ff;">'1-'</span><span style="color: #339933;">.</span><span style="color: #009900;">&#40;</span><span style="color: #000088;">$t</span><span style="color: #009900;">&#91;</span>year<span style="color: #009900;">&#93;</span><span style="color: #339933;">+</span><span style="color: #cc66cc;">1</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
  <span style="color: #009900;">&#125;</span> <span style="color: #b1b100;">elseif</span><span style="color: #009900;">&#40;</span><span style="color: #000088;">$t</span><span style="color: #009900;">&#91;</span>mday<span style="color: #009900;">&#93;</span> <span style="color: #339933;">&lt;=</span> <span style="color: #0000ff;">'7'</span> <span style="color: #339933;">&amp;&amp;</span> <span style="color: #000088;">$t</span><span style="color: #009900;">&#91;</span>wday<span style="color: #009900;">&#93;</span> <span style="color: #339933;">&lt;=</span> <span style="color: #0000ff;">'5'</span><span style="color: #009900;">&#41;</span> <span style="color: #009900;">&#123;</span>
    <span style="color: #000088;">$nm</span> <span style="color: #339933;">=</span> <span style="color: #009900;">&#40;</span><span style="color: #000088;">$t</span><span style="color: #009900;">&#91;</span>mon<span style="color: #009900;">&#93;</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">.</span><span style="color: #0000ff;">'-'</span><span style="color: #339933;">.</span><span style="color: #000088;">$t</span><span style="color: #009900;">&#91;</span>year<span style="color: #009900;">&#93;</span><span style="color: #339933;">;</span>
  <span style="color: #009900;">&#125;</span>	<span style="color: #b1b100;">else</span> <span style="color: #009900;">&#123;</span>
    <span style="color: #000088;">$nm</span> <span style="color: #339933;">=</span> <span style="color: #009900;">&#40;</span><span style="color: #000088;">$t</span><span style="color: #009900;">&#91;</span>mon<span style="color: #009900;">&#93;</span><span style="color: #339933;">+</span><span style="color: #cc66cc;">1</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">.</span><span style="color: #0000ff;">'-'</span><span style="color: #339933;">.</span><span style="color: #000088;">$t</span><span style="color: #009900;">&#91;</span>year<span style="color: #009900;">&#93;</span><span style="color: #339933;">;</span>
  <span style="color: #009900;">&#125;</span>
&nbsp;
  <span style="color: #000088;">$date</span> <span style="color: #339933;">=</span> get_day<span style="color: #009900;">&#40;</span><span style="color: #0000ff;">&quot;first&quot;</span><span style="color: #339933;">,</span> <span style="color: #0000ff;">&quot;friday&quot;</span><span style="color: #339933;">,</span> <span style="color: #000088;">$nm</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
&nbsp;
  <span style="color: #666666; font-style: italic;">//Checks if today is after the first friday of the month</span>
  <span style="color: #b1b100;">if</span><span style="color: #009900;">&#40;</span><span style="color: #000088;">$t</span><span style="color: #009900;">&#91;</span>mon<span style="color: #009900;">&#93;</span> <span style="color: #339933;">==</span> <span style="color: #990000;">date</span><span style="color: #009900;">&#40;</span><span style="color: #0000ff;">'m'</span><span style="color: #339933;">,</span><span style="color: #000088;">$date</span><span style="color: #009900;">&#41;</span>
    <span style="color: #339933;">&amp;&amp;</span> <span style="color: #000088;">$t</span><span style="color: #009900;">&#91;</span>mday<span style="color: #009900;">&#93;</span> <span style="color: #339933;">&gt;</span> <span style="color: #990000;">date</span><span style="color: #009900;">&#40;</span><span style="color: #0000ff;">'j'</span><span style="color: #339933;">,</span><span style="color: #000088;">$date</span><span style="color: #009900;">&#41;</span>
    <span style="color: #339933;">&amp;&amp;</span> <span style="color: #000088;">$t</span><span style="color: #009900;">&#91;</span>mon<span style="color: #009900;">&#93;</span> <span style="color: #339933;">==</span> <span style="color: #0000ff;">'12'</span><span style="color: #009900;">&#41;</span> <span style="color: #009900;">&#123;</span>
      <span style="color: #000088;">$nm</span> <span style="color: #339933;">=</span> <span style="color: #0000ff;">'1-'</span><span style="color: #339933;">.</span><span style="color: #009900;">&#40;</span><span style="color: #000088;">$t</span><span style="color: #009900;">&#91;</span>year<span style="color: #009900;">&#93;</span><span style="color: #339933;">+</span><span style="color: #cc66cc;">1</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
      <span style="color: #000088;">$ff</span> <span style="color: #339933;">=</span> get_day<span style="color: #009900;">&#40;</span><span style="color: #0000ff;">&quot;first&quot;</span><span style="color: #339933;">,</span> <span style="color: #0000ff;">&quot;friday&quot;</span><span style="color: #339933;">,</span> <span style="color: #000088;">$nm</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
  <span style="color: #009900;">&#125;</span> <span style="color: #b1b100;">elseif</span><span style="color: #009900;">&#40;</span><span style="color: #000088;">$t</span><span style="color: #009900;">&#91;</span>mon<span style="color: #009900;">&#93;</span> <span style="color: #339933;">==</span> <span style="color: #990000;">date</span><span style="color: #009900;">&#40;</span><span style="color: #0000ff;">'m'</span><span style="color: #339933;">,</span><span style="color: #000088;">$date</span><span style="color: #009900;">&#41;</span>
    <span style="color: #339933;">&amp;&amp;</span> <span style="color: #000088;">$t</span><span style="color: #009900;">&#91;</span>mday<span style="color: #009900;">&#93;</span> <span style="color: #339933;">&gt;</span> <span style="color: #990000;">date</span><span style="color: #009900;">&#40;</span><span style="color: #0000ff;">'j'</span><span style="color: #339933;">,</span><span style="color: #000088;">$date</span><span style="color: #009900;">&#41;</span> <span style="color: #339933;">&amp;&amp;</span> <span style="color: #000088;">$t</span><span style="color: #009900;">&#91;</span>mon<span style="color: #009900;">&#93;</span> <span style="color: #339933;">!=</span> <span style="color: #0000ff;">'12'</span><span style="color: #009900;">&#41;</span> <span style="color: #009900;">&#123;</span>
      <span style="color: #000088;">$nm</span> <span style="color: #339933;">=</span> <span style="color: #009900;">&#40;</span><span style="color: #000088;">$t</span><span style="color: #009900;">&#91;</span>mon<span style="color: #009900;">&#93;</span><span style="color: #339933;">+</span><span style="color: #cc66cc;">1</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">.</span><span style="color: #0000ff;">'-'</span><span style="color: #339933;">.</span><span style="color: #000088;">$t</span><span style="color: #009900;">&#91;</span>year<span style="color: #009900;">&#93;</span><span style="color: #339933;">;</span>
      <span style="color: #000088;">$ff</span> <span style="color: #339933;">=</span> get_day<span style="color: #009900;">&#40;</span><span style="color: #0000ff;">&quot;first&quot;</span><span style="color: #339933;">,</span><span style="color: #0000ff;">&quot;friday&quot;</span><span style="color: #339933;">,</span><span style="color: #000088;">$nm</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
  <span style="color: #009900;">&#125;</span>	<span style="color: #b1b100;">else</span> <span style="color: #009900;">&#123;</span>
    <span style="color: #000088;">$ff</span> <span style="color: #339933;">=</span> <span style="color: #000088;">$date</span><span style="color: #339933;">;</span>
  <span style="color: #009900;">&#125;</span>
&nbsp;
  <span style="color: #666666; font-style: italic;">// I know this code is crap, deal with it or fix it yourself!</span>
&nbsp;
  <span style="color: #b1b100;">echo</span> <span style="color: #990000;">date</span><span style="color: #009900;">&#40;</span><span style="color: #0000ff;">&quot;F j, Y&quot;</span><span style="color: #339933;">,</span> <span style="color: #000088;">$ff</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
&nbsp;
<span style="color: #000000; font-weight: bold;">?&gt;</span></pre></div></div>

<p>I apologies for the crappy code, I was either tired, drunk or both the night I wrote this.</p>
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