Simple function to return the number of days in a time span between 2 given dates.

Arguments are long integers as returned by the standard php function mktime().
Arguments can be generated using mktime(), dateEStime(), or
dateAryEStime(mySQLdate2Ary()).

Example:
A simple illustrator to show how the function is used.

Change comment characters on lines indicated to use text code.
The test code can be used singly or multiply.

By : dsilvia

<?php
/*
* (c) 2006, D.E. Silvia, All rights reserved.
* This code is available for use for non-commercial purposes.
* Free to distribute as long as this copyright information remains intact.
* No modification is authorized. Please, refer bugs/enhancements to
* dsilvia@mchsi.com
*
*/

/*
* Simple function to return the number of days in a time span between 2 given dates.
*
* Arguments are long integers as returned by the standard php function mktime().
* Arguments can be generated using mktime(), dateEStime(), or
* dateAryEStime(mySQLdate2Ary()).
*
* Example:
* A simple illustrator to show how the function is used.
*
* Change comment characters on lines indicated to use text code.
* The test code can be used singly or multiply.
*
* btw, ES|es stands for 'Epoch Seconds'
*

// Change line below from slash-slash to star-slash to use test code
//
$numDays00=daysInSpan(mktime(0,0,0,1,1,2000),mktime(0,0,0,4,1,2000));
$numDays01=daysInSpan(mktime(0,0,0,1,1,2001),mktime(0,0,0,4,1,2001));

print("Using mktime()<br />");
print("The first quarter of 2000 has $numDays00 days (leap year)<br />");
print("The first quarter of 2001 has $numDays01 days (not a leap year)<br /><br />");

/*
*
// Change line below from slash-slash to star-slash to use test code
//
// using DateSpan.php
include_once('DateSpan.php');
$numDays00=daysInSpan(dateEStime(1,1,2000),dateEStime(1,4,2000));
$numDays01=daysInSpan(dateEStime(1,1,2001),dateEStime(1,4,2001));

print("Using dateEStime() from DateSpan.php<br />");
print("The first quarter of 2000 has $numDays00 days (leap year)<br />");
print("The first quarter of 2001 has $numDays01 days (not a leap year)<br /><br />");
/*
*
*/

/*
*
// Change line below from slash-slash to star-slash to use test code
//
// using MySQLdateSpan.php
include_once('MySQLdateSpan.php');
$numDays00=daysInSpan(dateAryEStime(mySQLdate2Ary('2000-1-1')),dateAryEStime(mySQLdate2Ary('2000-4-1')));
$numDays01=daysInSpan(dateAryEStime(mySQLdate2Ary('2001-1-1')),dateAryEStime(mySQLdate2Ary('2001-4-1')));

print("Using mySQLdate2Ary() from MySQLdateSpan.php<br />");
print("The first quarter of 2000 has $numDays00 days (leap year)<br />");
print("The first quarter of 2001 has $numDays01 days (not a leap year)<br />");
/*
*
*/


function daysInSpan($start,$end)
{
$dayTicks=ticksInDay();
return ($end-$start)/$dayTicks;
}

function ticksInDay()
{
$today=getdate();
$yesterday=mktime(0,0,0,$today[mon],$today[mday]-1,$today[year]);
$today=mktime(0,0,0,$today[mon],$today[mday],$today[year]);
return $today-$yesterday;
}
?>

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