105 lines
3.3 KiB
PHP
105 lines
3.3 KiB
PHP
<?php
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/**
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* Generates the timezone selection form and JavaScript.
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*
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* Note: 'UTC/UTC' is mapped to 'UTC' to form a valid option
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*
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* Example: preselect Europe/Paris
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* list($htmlform, $js) = generateTimeZoneForm('Europe/Paris');
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*
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* @param string $preselectedTimezone preselected timezone (optional)
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*
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* @return array containing the generated HTML form and Javascript code
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**/
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function generateTimeZoneForm($preselectedTimezone='')
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{
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// Select the server timezone
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if ($preselectedTimezone == '') {
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$preselectedTimezone = date_default_timezone_get();
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}
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if ($preselectedTimezone == 'UTC') {
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$pcity = $pcontinent = 'UTC';
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} else {
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// Try to split the provided timezone
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$spos = strpos($preselectedTimezone, '/');
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$pcontinent = substr($preselectedTimezone, 0, $spos);
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$pcity = substr($preselectedTimezone, $spos+1);
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}
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// The list is in the form 'Europe/Paris', 'America/Argentina/Buenos_Aires'
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// We split the list in continents/cities.
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$continents = array();
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$cities = array();
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// TODO: use a template to generate the HTML/Javascript form
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foreach (timezone_identifiers_list() as $tz) {
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if ($tz == 'UTC') {
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$tz = 'UTC/UTC';
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}
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$spos = strpos($tz, '/');
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if ($spos !== false) {
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$continent = substr($tz, 0, $spos);
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$city = substr($tz, $spos+1);
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$continents[$continent] = 1;
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if (!isset($cities[$continent])) {
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$cities[$continent] = '';
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}
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$cities[$continent] .= '<option value="'.$city.'"';
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if ($pcity == $city) {
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$cities[$continent] .= ' selected="selected"';
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}
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$cities[$continent] .= '>'.$city.'</option>';
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}
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}
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$continentsHtml = '';
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$continents = array_keys($continents);
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foreach ($continents as $continent) {
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$continentsHtml .= '<option value="'.$continent.'"';
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if ($pcontinent == $continent) {
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$continentsHtml .= ' selected="selected"';
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}
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$continentsHtml .= '>'.$continent.'</option>';
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}
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// Timezone selection form
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$timezoneForm = 'Continent:';
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$timezoneForm .= '<select name="continent" id="continent" onChange="onChangecontinent();">';
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$timezoneForm .= $continentsHtml.'</select>';
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$timezoneForm .= ' City:';
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$timezoneForm .= '<select name="city" id="city">'.$cities[$pcontinent].'</select><br />';
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// Javascript handler - updates the city list when the user selects a continent
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$timezoneJs = '<script>';
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$timezoneJs .= 'function onChangecontinent() {';
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$timezoneJs .= 'document.getElementById("city").innerHTML =';
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$timezoneJs .= ' citiescontinent[document.getElementById("continent").value]; }';
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$timezoneJs .= 'var citiescontinent = '.json_encode($cities).';';
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$timezoneJs .= '</script>';
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return array($timezoneForm, $timezoneJs);
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}
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/**
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* Tells if a continent/city pair form a valid timezone
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*
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* Note: 'UTC/UTC' is mapped to 'UTC'
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*
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* @param string $continent the timezone continent
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* @param string $city the timezone city
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*
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* @return bool whether continent/city is a valid timezone
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*/
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function isTimeZoneValid($continent, $city)
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{
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return in_array(
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$continent.'/'.$city,
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timezone_identifiers_list()
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);
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}
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