What does this statement mean?

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While\[code\]$w is an Array ( [0] => 4, [1] => 6 )\[/code\]what does this statement mean:\[code\]$day == $w[0] || $day == $w[1] || $day < ((7 + $w[1] - $w[0]) % 7);\[/code\]Please help. I have not seen the \[code\]||\[/code\] operator inside other than an if or while statement. Thank you.EDIT 01:This is the original function where it is used to find the number of a particular day in a date range:\[code\]// find number of a particular day (sunday or monday or etc) within a date rangefunction number_of_days($day, $start, $end){ $w = array(date('w', $start), date('w', $end)); return floor( ( date('z', $end) - date('z', $start) ) / 7) + ($day == $w[0] || $day == $w[1] || $day < ((7 + $w[1] - $w[0]) % 7));}\[/code\]This was not created by me. But I wanted to edit this function because when the end day is a Saturday, it is taking the following Sunday into account too, which is wrong.