primer lugar me gustaría dar las gracias a @rudie por su respuesta y @jeremy refinamiento de su respuesta.
Necesitaba una versión un poco más flexible que podría manejar jQueryUI Datepicker con el plugin TimePicker. También necesitaba que funcionara con el carácter de escape de barra invertida \ para tratar los formatos de tiempo impar que los usuarios ingresan, como H\h i\m\i\n.
Aquí está mi solución basada en las respuestas anteriores que implementé en mi Connections Business Directory WordPress plugin.
Se parece más a la funcionalidad de date_parse_from_format() y DateTime::createFromFormat().
Espero que esto ayude a alguien!
<?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);
}
}
¿Tiene 'strtotime()' no funciona? – Michael