PHP verifies whether the format of a date is correct

小云云
Release: 2023-03-17 14:08:02
Original
20549 people have browsed it

In PHP development, we will definitely come into contact with the date() function. We have introduced some uses of the PHPdate function before. I believe everyone will use it. This article mainly teaches you how to determine whether the format of a date is correct in PHP.

Idea

You can use strtotime() to convert the date ($date) into a timestamp, and then use date() to convert it into the format that needs to be verified. A date is compared with $date to see if it is the same to verify whether the format of the date is correct.

Regular verification date format

$dateTime=”2010-6-4 00:00:00″;
if(preg_match(“/^d{4}-d{2}-d{2} d{2}:d{2}:d{2}$/s”,$dateTime))
{
echo “Yes”;
}else{
echo “No”;
}
Copy after login

Example

/* 
* 方法 isDate 
* 功能 判断日期格式是否正确 
* 参数 $str 日期字符串 
$format 日期格式 
* 返回 无 
*/ 
function is_Date($str,$format='Y-m-d'){ 
    $unixTime_1=strtotime($str); 
    if(!is_numeric($unixTime_1)) return false; //如果不是数字格式,则直接返回 
    $checkDate=date($format,$unixTime_1); 
    $unixTime_2=strtotime($checkDate); 
    if($unixTime_1==$unixTime_2){ 
        return true; 
    }else{ 
        return false; 
    } 
}
Copy after login

Note that the above judgment method is sufficient for general requirements , but it is not very strict. It will also return true for dates in this format such as 2012-03-00 or 2012-02-31. I have not found a better solution

The following code verifies whether the date is 2015 The format of -08-11 20:06:08:

<?php
 header("Content-type:text/html;charset=utf-8");
 $date = &#39;2015-08-11 20:06:08&#39;;
 if( date(&#39;Y-m-d H:i:s&#39;, strtotime($date))  == $date )
 {
  echo &#39;yes&#39;;
 }
 else
 {
  echo &#39;no&#39;;
 }
?>
Copy after login

So to verify whether the date format is 2015-08-11, you can change it to if(date('Y-m-d', strtotime($date) ) == $date ) to determine, verify other formats, and so on.

Although the article seems very short and the method seems simple, it is indeed a very practical small case. Everyone, hurry up and get it!

Related recommendations:

A related question about the PHPdate() function

php date() function obtains the current date and time and Detailed explanation of formatting method parameters

Do you know the difference between php date and gmdate to obtain the date?

The above is the detailed content of PHP verifies whether the format of a date is correct. For more information, please follow other related articles on the PHP Chinese website!

Related labels:
source:php.cn
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Popular Tutorials
More>
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template
About us Disclaimer Sitemap
php.cn:Public welfare online PHP training,Help PHP learners grow quickly!