PHP DateTime() class, change first day of the week to Monday

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I found this to work, yet there are some inconsistencies in PHP’s DateTime class.

If the departing date is a sunday the previous monday is not considered the same week (fixed by this class). But departing from a monday, the next sunday is considered as the same week. If they fix that in the future this class will need some additions.

class EuroDateTime extends DateTime {

// Override "modify()"
public function modify($string) {

    // Change the modifier string if needed
    if ( $this->format('N') == 7 ) { // It's Sunday and we're calculating a day using relative weeks
        $matches = array();
        $pattern = '/this week|next week|previous week|last week/i';
        if ( preg_match( $pattern, $string, $matches )) {
            $string = str_replace($matches[0], '-7 days '.$matches[0], $string);
        }
    }
    return parent::modify($string);

}

}

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