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<?php
/**
* Generates the timezone selection form and JavaScript.
*
* Note: 'UTC/UTC' is mapped to 'UTC' to form a valid option
*
* Example: preselect Europe/Paris
* list($htmlform, $js) = templateTZform('Europe/Paris');
*
* @param string $preselected_timezone preselected timezone (optional)
*
* @return an array containing the generated HTML form and Javascript code
**/
function generateTimeZoneForm($preselected_timezone='')
{
// Select the first available timezone if no preselected value is passed
if ($preselected_timezone == '') {
$l = timezone_identifiers_list();
$preselected_timezone = $l[0];
}
// Try to split the provided timezone
$spos = strpos($preselected_timezone, '/');
$pcontinent = substr($preselected_timezone, 0, $spos);
$pcity = substr($preselected_timezone, $spos+1);
// Display config form:
$timezone_form = '';
$timezone_js = '';
// The list is in the form 'Europe/Paris', 'America/Argentina/Buenos_Aires'...
// We split the list in continents/cities.
$continents = array();
$cities = array();
// TODO: use a template to generate the HTML/Javascript form
foreach (timezone_identifiers_list() as $tz) {
if ($tz == 'UTC') {
$tz = 'UTC/UTC';
}
$spos = strpos($tz, '/');
if ($spos !== false) {
$continent = substr($tz, 0, $spos);
$city = substr($tz, $spos+1);
$continents[$continent] = 1;
if (!isset($cities[$continent])) {
$cities[$continent] = '';
}
$cities[$continent] .= '<option value="'.$city.'"';
if ($pcity == $city) {
$cities[$continent] .= ' selected="selected"';
}
$cities[$continent] .= '>'.$city.'</option>';
}
}
$continents_html = '';
$continents = array_keys($continents);
foreach ($continents as $continent) {
$continents_html .= '<option value="'.$continent.'"';
if ($pcontinent == $continent) {
$continents_html .= ' selected="selected"';
}
$continents_html .= '>'.$continent.'</option>';
}
// Timezone selection form
$timezone_form = 'Continent:';
$timezone_form .= '<select name="continent" id="continent" onChange="onChangecontinent();">';
$timezone_form .= $continents_html.'</select>';
$timezone_form .= ' City:';
$timezone_form .= '<select name="city" id="city">'.$cities[$pcontinent].'</select><br />';
// Javascript handler - updates the city list when the user selects a continent
$timezone_js = '<script>';
$timezone_js .= 'function onChangecontinent() {';
$timezone_js .= 'document.getElementById("city").innerHTML =';
$timezone_js .= ' citiescontinent[document.getElementById("continent").value]; }';
$timezone_js .= 'var citiescontinent = '.json_encode($cities).';';
$timezone_js .= '</script>';
return array($timezone_form, $timezone_js);
}
/**
* Tells if a continent/city pair form a valid timezone
*
* Note: 'UTC/UTC' is mapped to 'UTC'
*
* @param string $continent the timezone continent
* @param string $city the timezone city
*
* @return whether continent/city is a valid timezone
*/
function isTimeZoneValid($continent, $city)
{
if ($continent == 'UTC' && $city == 'UTC') {
return true;
}
return in_array(
$continent.'/'.$city,
timezone_identifiers_list()
);
}
?>
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