如何使用 PHP 验证日期
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how to validate date with PHP
提问by adam
If a date is submitted by form in following format, $month=2, $day=31, $year= 2010. How can i verify using PHP date function if it is valid date or not? Thanks.
如果按以下格式通过表单提交日期，则$month=2, $day=31, $year= 2010. 如何使用 PHP 日期函数验证它是否为有效日期？谢谢。
回答by Jonno_FTW
http://php.net/manual/en/function.checkdate.php
http://php.net/manual/en/function.checkdate.php
The checkdatefunction is the first result in google from the search "php validate date"
该checkdate函数是谷歌搜索“php验证日期”的第一个结果
In your case, the usage would be:
在您的情况下，用法是：
checkdate($month, $day, $year);
回答by ahmeti
<?php
function validateDate($date, $format = 'Y-m-d H:i:s'){
$d = DateTime::createFromFormat($format, $date);
return $d && $d->format($format) == $date;
}
?>
var_dump(validateDate('2012-02-28 12:12:12')); # true
var_dump(validateDate('2012-02-30 12:12:12')); # false
var_dump(validateDate('2012-02-28', 'Y-m-d')); # true
var_dump(validateDate('28/02/2012', 'd/m/Y')); # true
var_dump(validateDate('30/02/2012', 'd/m/Y')); # false
回答by TuK
Try checkdate() http://php.net/manual/en/function.checkdate.php
试试 checkdate() http://php.net/manual/en/function.checkdate.php
checkdate($month, $day, $year);
returns true if date is valid / false otherwise
如果日期有效则返回真/否则返回假
回答by Gustavo Costa De Oliveira
bool checkdate ( int $month , int $day , int $year )
回答by Jon Hulka
Here's what I've come up with to combine the strictness of checkdate() with the convenience of DateTime (It converts entries like 'next thursday' or '2 weeks ago')
这是我想出的将 checkdate() 的严格性与 DateTime 的便利性相结合的方法（它可以转换诸如“下周四”或“两周前”之类的条目）
If the input string is invalid, it returns false. Empty dates are returned as null, and non-empty dates are formatted MySQL style 'Y-m-d'.
如果输入字符串无效，则返回 false。空日期返回为空，非空日期格式为 MySQL 样式“Ym-d”。
/**
* @return variant null for empty date, mysql date string for valid date, or false for invalid date string
*/
function myCheckDate($date)
{
$result=false;
if($date=='')
{
$result=null;
}
else
{
//Best of both worlds
// - flexibility of DateTime (next thursday, 2 weeks ago, etc)
// - strictness of checkdate (2000-02-31 is not allowed)
$m=false;
$d=false;
$y=false;
$parts=date_parse($date);
if($parts!==false)
{
$m=$parts['month'];
$d=$parts['day'];
$y=$parts['year'];
}
if($m!==false && $d!==false)
{
if($y===false) $y=date('Y'); //Default to this year
//Try for a specific date - this catches bad entries like 'feb 31, 2000'
if(checkdate($m,$d,$y)) $result=sprintf('%04d-%02d-%02d',$y,$m,$d);
}
else
{
//Try for something more generic - this allows entries like 'next thursday'
$dt=false;
try{ $dt=new \DateTime($date); }catch(\Exception $e){ $dt=false; }
if($dt!==false) $result=$dt->format('Y-m-d');
}
}
return $result;
}
