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1 | <?php | |
2 | /** | |
3 | * Generates a list of available timezone continents and cities. | |
4 | * | |
5 | * Two distinct array based on available timezones | |
6 | * and the one selected in the settings: | |
7 | * - (0) continents: | |
8 | * + list of available continents | |
9 | * + special key 'selected' containing the value of the selected timezone's continent | |
10 | * - (1) cities: | |
11 | * + list of available cities associated with their continent | |
12 | * + special key 'selected' containing the value of the selected timezone's city (without the continent) | |
13 | * | |
14 | * Example: | |
15 | * [ | |
16 | * [ | |
17 | * 'America', | |
18 | * 'Europe', | |
19 | * 'selected' => 'Europe', | |
20 | * ], | |
21 | * [ | |
22 | * ['continent' => 'America', 'city' => 'Toronto'], | |
23 | * ['continent' => 'Europe', 'city' => 'Paris'], | |
24 | * 'selected' => 'Paris', | |
25 | * ], | |
26 | * ]; | |
27 | * | |
28 | * Notes: | |
29 | * - 'UTC/UTC' is mapped to 'UTC' to form a valid option | |
30 | * - a few timezone cities includes the country/state, such as Argentina/Buenos_Aires | |
31 | * - these arrays are designed to build timezone selects in template files with any HTML structure | |
32 | * | |
33 | * @param array $installedTimeZones List of installed timezones as string | |
34 | * @param string $preselectedTimezone preselected timezone (optional) | |
35 | * | |
36 | * @return array[] continents and cities | |
37 | **/ | |
38 | function generateTimeZoneData($installedTimeZones, $preselectedTimezone = '') | |
39 | { | |
40 | if ($preselectedTimezone == 'UTC') { | |
41 | $pcity = $pcontinent = 'UTC'; | |
42 | } else { | |
43 | // Try to split the provided timezone | |
44 | $spos = strpos($preselectedTimezone, '/'); | |
45 | $pcontinent = substr($preselectedTimezone, 0, $spos); | |
46 | $pcity = substr($preselectedTimezone, $spos+1); | |
47 | } | |
48 | ||
49 | $continents = []; | |
50 | $cities = []; | |
51 | foreach ($installedTimeZones as $tz) { | |
52 | if ($tz == 'UTC') { | |
53 | $tz = 'UTC/UTC'; | |
54 | } | |
55 | $spos = strpos($tz, '/'); | |
56 | ||
57 | // Ignore invalid timezones | |
58 | if ($spos === false) { | |
59 | continue; | |
60 | } | |
61 | ||
62 | $continent = substr($tz, 0, $spos); | |
63 | $city = substr($tz, $spos+1); | |
64 | $cities[] = ['continent' => $continent, 'city' => $city]; | |
65 | $continents[$continent] = true; | |
66 | } | |
67 | ||
68 | $continents = array_keys($continents); | |
69 | $continents['selected'] = $pcontinent; | |
70 | $cities['selected'] = $pcity; | |
71 | ||
72 | return [$continents, $cities]; | |
73 | } | |
74 | ||
75 | /** | |
76 | * Tells if a continent/city pair form a valid timezone | |
77 | * | |
78 | * Note: 'UTC/UTC' is mapped to 'UTC' | |
79 | * | |
80 | * @param string $continent the timezone continent | |
81 | * @param string $city the timezone city | |
82 | * | |
83 | * @return bool whether continent/city is a valid timezone | |
84 | */ | |
85 | function isTimeZoneValid($continent, $city) | |
86 | { | |
87 | return in_array( | |
88 | $continent.'/'.$city, | |
89 | timezone_identifiers_list() | |
90 | ); | |
91 | } |