📄 function.easter-days.html
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html> <head> <title>Get number of days after March 21 on which Easter falls for a given year</title> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> </head> <body><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.easter-date.html">easter_date</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.frenchtojd.html">FrenchToJD</a></div> <div class="up"><a href="ref.calendar.html">Calendar Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="function.easter-days" class="refentry"> <div class="refnamediv"> <h1 class="refname">easter_days</h1> <p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">easter_days</span> — <span class="dc-title">Get number of days after March 21 on which Easter falls for a given year</span></p> </div> <div class="refsect1 description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type">int</span> <span class="methodname"><b><b>easter_days</b></b></span> ([ <span class="methodparam"><span class="type">int</span> <tt class="parameter">$year</tt></span> [, <span class="methodparam"><span class="type">int</span> <tt class="parameter">$method</tt></span> ]] )</div> <p class="para rdfs-comment"> Returns the number of days after March 21 on which Easter falls for a given year. If no year is specified, the current year is assumed. </p> <p class="para"> This function can be used instead of <a href="function.easter-date.html" class="function">easter_date()</a> to calculate Easter for years which fall outside the range of Unix timestamps (i.e. before 1970 or after 2037). </p> <p class="para"> The date of Easter Day was defined by the Council of Nicaea in AD325 as the Sunday after the first full moon which falls on or after the Spring Equinox. The Equinox is assumed to always fall on 21st March, so the calculation reduces to determining the date of the full moon and the date of the following Sunday. The algorithm used here was introduced around the year 532 by Dionysius Exiguus. Under the Julian Calendar (for years before 1753) a simple 19-year cycle is used to track the phases of the Moon. Under the Gregorian Calendar (for years after 1753 - devised by Clavius and Lilius, and introduced by Pope Gregory XIII in October 1582, and into Britain and its then colonies in September 1752) two correction factors are added to make the cycle more accurate. </p> <p class="para"> (The code is based on a C program by Simon Kershaw, <webmaster at ely.anglican dot org>) </p> </div> <div class="refsect1 parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><i><tt class="parameter">year</tt></i></span> <dd> <p class="para"> The year as a positive number </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">method</tt></i></span> <dd> <p class="para"> Allows to calculate easter dates based on the Gregorian calendar during the years 1582 - 1752 when set to <b><tt>CAL_EASTER_ROMAN</tt></b>. See the <a href="calendar.constants.html" class="link">calendar constants</a> for more valid constants. </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> The number of days after March 21st that the Easter Sunday is in the given <i><tt class="parameter">year</tt></i>. </p> </div> <div class="refsect1 changelog"> <h3 class="title">ChangeLog</h3> <p class="para"> <table class="informaltable"> <colgroup> <thead valign="middle"> <tr valign="middle"> <th colspan="1">Version</th> <th colspan="1">Description</th> </tr> </thead> <tbody valign="middle" class="tbody"> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">Since 4.3.0</td> <td colspan="1" rowspan="1" align="left"> The <i><tt class="parameter">year</tt></i> parameter is optional and defaults to the current year according to the local time if omitted. </td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">Since 4.3.0</td> <td colspan="1" rowspan="1" align="left"> The <i><tt class="parameter">method</tt></i> parameter was introduced. </td> </tr> </tbody> </colgroup> </table> </p> </div> <div class="refsect1 examples"> <h3 class="title">Examples</h3> <p class="para"> <div class="example"> <p><b>Example #1 <b>easter_days()</b> example</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br /><br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">easter_days</span><span style="color: #007700">(</span><span style="color: #0000BB">1999</span><span style="color: #007700">); </span><span style="color: #FF8000">// 14, i.e. April 4<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">easter_days</span><span style="color: #007700">(</span><span style="color: #0000BB">1492</span><span style="color: #007700">); </span><span style="color: #FF8000">// 32, i.e. April 22<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">easter_days</span><span style="color: #007700">(</span><span style="color: #0000BB">1913</span><span style="color: #007700">); </span><span style="color: #FF8000">// 2, i.e. March 23<br /><br /></span><span style="color: #0000BB">?></span></span></code></div> </div> </div> </p> </div> <div class="refsect1 seealso"> <h3 class="title">See Also</h3> <p class="para"> <ul class="simplelist"> <li class="member"><a href="function.easter-date.html" class="function" rel="rdfs-seeAlso">easter_date()</a></li> </ul> </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.easter-date.html">easter_date</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.frenchtojd.html">FrenchToJD</a></div> <div class="up"><a href="ref.calendar.html">Calendar Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div></body></html>⌨️ 快捷键说明
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