TimezoneFilter.php

Go to the documentation of this file.

<?php
namespace MediaWiki\Preferences;
 
use DateTimeZone;
use Exception;
 
class TimezoneFilter implements Filter {
 
    public function filterForForm( $value ) {
        return $value;
    }
 
    public function filterFromForm( $tz ) {
        $data = explode( '|', $tz, 3 );
        switch ( $data[0] ) {
            case 'ZoneInfo':
                $valid = false;
 
                if ( count( $data ) === 3 ) {
                    // Make sure this timezone exists
                    try {
                        new DateTimeZone( $data[2] );
                        // If the constructor didn't throw, we know it's valid
                        $valid = true;
                    } catch ( Exception $e ) {
                        // Not a valid timezone
                    }
                }
 
                if ( !$valid ) {
                    // If the supplied timezone doesn't exist, fall back to the encoded offset
                    return 'Offset|' . intval( $tz[1] );
                }
                return $tz;
            case 'System':
                return $tz;
            default:
                $data = explode( ':', $tz, 2 );
                if ( count( $data ) == 2 ) {
                    $data[0] = intval( $data[0] );
                    $data[1] = intval( $data[1] );
                    $minDiff = abs( $data[0] ) * 60 + $data[1];
                    if ( $data[0] < 0 ) {
                        $minDiff = - $minDiff;
                    }
                } else {
                    $minDiff = intval( $data[0] ) * 60;
                }
 
                # Max is +14:00 and min is -12:00, see:
                # https://en.wikipedia.org/wiki/Timezone
                # 14:00
                $minDiff = min( $minDiff, 840 );
                # -12:00
                $minDiff = max( $minDiff, -720 );
                return 'Offset|' . $minDiff;
        }
    }
}