首先我要感謝@rudie的回答和@jeremy提煉他的回答。
我需要一個更靈活的版本可以處理與TimePicker插件jQueryUI Datepicker。我還需要它與\反斜槓轉義字符一起使用，以處理用戶輸入的奇怪時間格式，例如H\h i\m\i\n。
這是我的解決方案，基於我在Connections Business Directory WordPress plugin中實現的那些以前的答案。
它更接近地匹配date_parse_from_format()和DateTime::createFromFormat()的功能。
希望這可以幫助別人！
<?php
/**
* Class cnDate
*/
class cnDate {
/**
* Date format characters and their name and regex structure.
*
* @access public
* @since 8.6.4
*
* @var array
*/
protected static $keys = array(
'Y' => array('year', '\d{4}'), // Year with 4 Digits
'y' => array('year', '\d{2}'), // Year with 2 Digits
'm' => array('month', '\d{2}'), // Month with leading 0
'n' => array('month', '\d{1,2}'), // Month without the leading 0
'M' => array('month', '[A-Z][a-z]{2}'), // Month ABBR 3 letters
'F' => array('month', '[A-Z][a-z]{2,8}'), // Month Name
'd' => array('day', '\d{2}'), // Day with leading 0
'j' => array('day', '\d{1,2}'), // Day without leading 0
'D' => array('day', '[A-Z][a-z]{2}'), // Day ABBR 3 Letters
'l' => array('day', '[A-Z][a-z]{5,8}'), // Day Name
'h' => array('hour', '\d{2}'), // Hour 12h formatted, with leading 0
'H' => array('hour', '\d{2}'), // Hour 24h formatted, with leading 0
'g' => array('hour', '\d{1,2}'), // Hour 12h formatted, without leading 0
'G' => array('hour', '\d{1,2}'), // Hour 24h formatted, without leading 0
'i' => array('minute', '\d{2}'), // Minutes with leading 0
's' => array('second', '\d{2}'), // Seconds with leading 0
'u' => array('hour', '\d{1,6}'), // Microseconds
'a' => array('meridiem', '[ap]m'), // Lowercase ante meridiem and Post meridiem
'A' => array('meridiem', '[AP]M'), // Uppercase ante meridiem and Post meridiem
);
/**
* Create a regex used to parse the supplied datetime format.
*
* @access public
* @since 8.6.4
*
* @param string $format The datetime format.
*
* @return string
*/
private static function getFormatRegex($format) {
$keys = self::$keys;
// Convert format string to regex.
$regex = '';
$chars = str_split($format);
foreach ($chars as $n => $char) {
$lastChar = isset($chars[ $n - 1 ]) ? $chars[ $n - 1 ] : '';
$skipCurrent = '\\' == $lastChar;
if (! $skipCurrent && isset($keys[ $char ])) {
$regex .= '(?P<' . $keys[ $char ][0] . '>' . $keys[ $char ][1] . ')';
} elseif ('\\' == $char || '!' == $char) {
/*
* No need to add the date format escaping character to the regex since it should not exist in the
* supplied datetime string. Including it would cause the preg_match to fail.
*/
//$regex .= $char;
} else {
$regex .= preg_quote($char);
}
}
return '#^' . $regex . '$#';
}
/**
* PHP 5.2 does not have a version of @see date_parse_from_format(), this is a mostly PHP 5.2 compatible version.
*
* @link http://stackoverflow.com/a/14196482/5351316
*
* @access public
* @since 8.6.4
*
* @param string $format The datetime format.
* @param string $date The datetime string to parse.
*
* @return array
*/
public static function parseFromFormat($format, $date) {
/** Setup the default values to be returned, matching @see date_parse_from_format() */
$dt = array(
'year' => FALSE,
'month' => FALSE,
'day' => FALSE,
'hour' => FALSE,
'minute' => FALSE,
'second' => FALSE,
'fraction' => FALSE,
'warning_count' => 0,
'warnings' => array(),
'error_count' => 0,
'errors' => array(),
'is_localtime' => FALSE,
'zone_type' => 0,
'zone' => 0,
'is_dst' => '',
);
// Now try to match it.
if (preg_match(self::getFormatRegex($format), $date, $matches)) {
foreach ($matches as $k => $v) {
// Remove unwanted indexes from resulting preg_match.
if (is_int($k)) {
unset($matches[ $k ]);
}
// Year, month, day, hour, minute, second and fraction should be coerced from string to int.
if (in_array($k, array('year', 'month', 'day', 'hour', 'minute', 'second', 'fraction'))
&& is_numeric($v)) {
$matches[ $k ] = (int) $v;
} elseif ('month' === $k) {
$parsed = date_parse($v);
$matches[ $k ] = (int) $parsed['month'];
} elseif ('day' === $k) {
$parsed = date_parse($v);
$matches[ $k ] = (int) $parsed['day'];
}
}
} else {
$dt['error_count'] = 1;
$dt['errors'][] = 'Invalid date supplied.'; // @todo match error string from date_parse_from_format()
}
return wp_parse_args($matches, $dt);
}
/**
* PHP 5.2 does not have a version of @see DateTime::createFromFormat(), this is a mostly PHP 5.2 compatible version.
*
* @link http://bordoni.me/date_parse_from_format-php-5-2/
*
* @access public
* @since 8.6.4
*
* @param string $format The datetime format.
* @param string $date The datetime string to parse.
*
* @return false|DateTime Instance of DateTime, false on failure.
*/
public static function createFromFormat($format, $date) {
$keys = self::$keys;
$pos = strpos($format, '!');
$chars = str_split($format);
// Setup default datetime values based on time now or Unix epoch based on if `!` if present in $format.
if (FALSE !== $pos) {
$datetime = array(
'year' => '1970',
'month' => '01',
'day' => '01',
'hour' => '00',
'minute' => '00',
'second' => '00',
'fraction' => '000000',
);
} else {
/** @link http://stackoverflow.com/a/38334226/5351316 */
list($usec, $sec) = explode(' ', microtime());
$datetime = array(
'year' => date('Y', $sec),
'month' => date('m', $sec),
'day' => date('d', $sec),
'hour' => date('H', $sec),
'minute' => date('i', $sec),
'second' => date('s', $sec),
'fraction' => substr($usec, 2, 6),
);
}
$parsed = self::parseFromFormat($format, $date);
foreach ($chars as $n => $char) {
$lastChar = isset($chars[ $n - 1 ]) ? $chars[ $n - 1 ] : '';
$skipCurrent = '\\' == $lastChar;
if (! $skipCurrent && isset($keys[ $char ])) {
// Existing value exists in supplied parsed date.
if ($parsed[ $keys[ $char ][0] ]) {
/*
* Replace default datetime interval with the parsed datetime interval only if
* an `!` was found within the supplied $format and its position is
* greater than the current $format character position.
*/
if (! (FALSE !== $pos && $pos > $n)) {
$datetime[ $keys[ $char ][0] ] = $parsed[ $keys[ $char ][0] ];
}
}
}
}
// Ensure the datetime integers are correctly padded with leading zeros.
$datetime['month'] = str_pad($datetime['month'], 2, '0', STR_PAD_LEFT);
$datetime['day'] = str_pad($datetime['day'], 2, '0', STR_PAD_LEFT);
$datetime['hour'] = str_pad($datetime['hour'], 2, '0', STR_PAD_LEFT);
$datetime['minute'] = str_pad($datetime['minute'], 2, '0', STR_PAD_LEFT);
$datetime['second'] = str_pad($datetime['second'], 2, '0', STR_PAD_LEFT);
// Parse the $datetime into a string which can be parsed by DateTime().
$formatted = strtr('year-month-day hour:minute:second.fraction', $datetime);
// Sanity check to make sure the datetime is valid.
if (! strtotime($formatted)) {
return FALSE;
}
// Return a new DateTime instance.
return new DateTime($formatted);
}
}
是否'的strtotime（）'不工作？ – Michael