首先我要感谢@rudie 的回答和@jeremy 对他的回答的完善。
我需要一个更灵活的版本来处理带有 TimePicker 插件的 jQueryUI Datepicker。我还需要它与\ 反斜杠转义字符一起使用，以处理用户输入的奇怪时间格式，例如H\h i\m\i\n。
这是我的解决方案，基于我在 Connections Business Directory WordPress plugin 中实施的那些先前的答案。
它更接近于date_parse_from_format() 和DateTime::createFromFormat() 的功能。
希望这对某人有所帮助！
<?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 );
}
}