php method to determine the day of the week a date is: You can use the date() function to determine. The date() function can format the timestamp into a more readable date and time. The specific usage method is: [date('l', strtotime('2019-4-6'));].
The PHP date() function formats a timestamp into a more readable date and time.
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Syntax:
string date ( string $format [, int $timestamp ] )
Parameters:
format Required. Specifies the format of the timestamp
timestamp Optional. Specify timestamp. The default is the current date and time
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Code implementation:
1 , date('l'), obtains the English day of the week. Sunday to Saturday
date('l', strtotime('2019-4-6')); // Saturday
2, date('D'), get the first three letters of the English alphabet. Mon to Sun
date('D', strtotime('2019-4-6')); // Sat
3, date('w'), what is obtained is a number, 0 (meaning Sunday) to 6 (meaning Saturday)
date('w', strtotime('2019-4-6')); // 6
4, date('N') , obtains the day of the week represented by numbers in ISO-8601 format (newly added in PHP 5.1.0), 1 (meaning Monday) to 7 (meaning Sunday)
date('N', strtotime('2019-4-6')); // 6
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