Created
June 5, 2019 14:43
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Crude attempt at supporting Elasticsearch date math values in PHP's DateTime object
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<?php | |
namespace MyNamespace; | |
/** | |
* @author Ton Sharp | |
* @author Brian Litzinger | |
* @see https://gist.github.com/66Ton99/60571ee49bf1906aaa1c | |
* @see https://www.elastic.co/guide/en/elasticsearch/reference/5.3/common-options.html#date-math | |
*/ | |
class DateTime extends \DateTime | |
{ | |
/** | |
* @param int|null $year | |
* @param int|null $month | |
* @param int|null $day | |
* | |
* @return $this | |
*/ | |
public function setDate($year, $month, $day) | |
{ | |
if (null == $year) { | |
$year = $this->format('Y'); | |
} | |
if (null == $month) { | |
$month = $this->format('n'); | |
} | |
if (null == $day) { | |
$day = $this->format('j'); | |
} | |
$daysInMonth = cal_days_in_month(CAL_GREGORIAN, $month, $year); | |
$day = $day > $daysInMonth ? $daysInMonth : $day; | |
$return = parent::setDate($year, $month, $day); | |
return $return; | |
} | |
/** | |
* @inheritdoc | |
*/ | |
public function modify($modify) | |
{ | |
$pattern = '/(now)?([-+]\d+\w)(\/\w)?/'; | |
preg_match_all($pattern, $modify, $allMatches, PREG_SET_ORDER); | |
if (empty($allMatches)) { | |
return $this; | |
} | |
foreach ($allMatches as $matches) { | |
$modify = preg_replace_callback( | |
$pattern, | |
function ($matches) use ($pattern) { | |
if (empty($matches[0])) { | |
return; | |
} | |
$value = $this->stringify($matches[2]); | |
$modifier = $matches[3] ?? null; | |
$value = parent::modify($value); | |
if ($value && $modifier) { | |
$this->applyModifier($modifier); | |
} | |
return; | |
}, | |
$modify | |
); | |
if ($modify = trim($modify)) { | |
return parent::modify($modify); | |
} | |
} | |
return $this; | |
} | |
private function stringify($value) | |
{ | |
$pattern = '/(\d+)(\w+)/'; | |
return preg_replace_callback( | |
$pattern, | |
function ($matches) { | |
if (empty($matches)) { | |
return ''; | |
} | |
return $matches[1].$this->transpose($matches[2]); | |
}, | |
$value | |
); | |
} | |
private function transpose($value) | |
{ | |
$options = [ | |
'd' => ' day', | |
'h' => ' hour', | |
'H' => ' hour', | |
'm' => ' minutes', | |
'M' => ' month', | |
's' => ' second', | |
'w' => ' week', | |
'y' => ' year', | |
]; | |
return $options[$value] ?? ''; | |
} | |
private function applyModifier($modifier) | |
{ | |
switch ($modifier) { | |
case '/d': | |
parent::modify('today midnight'); | |
break; | |
case '/M': | |
parent::modify('first day of this month'); | |
parent::modify('today midnight'); | |
break; | |
} | |
} | |
} |
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