Home Backend Development PHP Tutorial Detailed explanation of PHP regular matching date and timestamp conversion cases

Detailed explanation of PHP regular matching date and timestamp conversion cases

May 29, 2018 pm 03:21 PM
php date time regular

本文介绍下,用php实现正则匹配日期与时间,并进行时间戳转换的例子,有需要的朋友,参考下吧

先来一个比较简单实用的代码

日期YYYY-MM-DD


$str = '';
$isMatched = preg_match('/^\d{4}(\-|\/|.)\d{1,2}\1\d{1,2}$/', $str, $matches);
var_dump($isMatched, $matches);
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php需要一定的时间格式才能转换成时间戳(表示从格林威治时间1970年01月01日00时00分00秒起至现在的总秒数),这就要用到php正则判断,以下是代码:


<?php
//匹配时间格式为2016-02-16或2016-02-16 23:59:59前面为0时可以不写
$time = "2016-12-14 23:59:59";
$patten = "/^\d{4}[\-](0?[1-9]|1[012])[\-](0?[1-9]|[12][0-9]|3[01])(\s+(0?[0-9]|1[0-9]|2[0-3])\:(0?[0-9]|[1-5][0-9])\:(0?[0-9]|[1-5][0-9]))?$/";
if (preg_match($patten, $time)) {
 echo $timestro = strtotime($time);
} else {
 echo "error";
}
?>
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对该正则的分析:

/^\d{4}[\-](0?[1-9]|1[012])[\-](0?[1-9]|[12][0-9]|3[01])(\s+(0?[0-9]|[12][0-3])\:(0?[0-9]|[1-5][1-9])\:(0?[0-9]|[1-5][1-9]))?$/

/是表达式开始符 最后面的/是表达式的结束符
^字符串的开始,即以***开始
$表示字符串的结尾,即表示已***结尾
|表示或者
()表示一个单元
d{4}匹配一个4位数,
(\-)匹配一个“-”号,
(0?[1-9]|1[012])匹配月份,
(0?[1-9]|[12][0-9]|3[01])匹配天,
(\s+(0?[0-9]|1[0-9]|2[0-3])\:(0?[0-9]|[1-5][0-9])\:(0?[0-9]|[1-5][0-9]))?整个匹配时分秒部分,?表示有或者没有。
最后一步是对匹配成功的部分,进行时间戳转换。
当前转换结果为:1329407999

附上我自己写的实例,代码如下:


<meta charset=&#39;utf-8&#39;> 
<pre class="brush:php;toolbar:false"> 
<?php 
$str="嘿嘿2010/07/08 12:31:56哈哈1999/12/31 13:21:45"; 
$str2="嘿嘿2010-07-08 12:31:56哈哈1999-12-31 13:21:45"; 
//仅匹配日期 
preg_match_all("/d{4}/d{2}/d{2}/", $str, $arr); 
preg_match_all("/d{4}-d{2}-d{2}/", $str2, $arr2); 
//匹配日期与时间 
preg_match_all("/d{4}/d{2}/d{2}sd{2}:d{2}:d{2}/", $str, $arr3); 
preg_match_all("/d{4}-d{2}-d{2}sd{2}:d{2}:d{2}/", $str2, $arr4); 
echo &#39;<font color="red">匹配日期</font><br>&#39;; 
print_r($arr); 
print_r($arr2); 
echo &#39;<font color="red">匹配日期和时间</font><br>&#39;; 
print_r($arr3); 
print_r($arr4); 
?> 
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以上就是本文的全部内容,希望对大家的学习有所帮助。


相关推荐:

个人理解正则表达式——懒惰匹配,正则表达式匹配_PHP教程

php 正则怎么匹配“/”,网络上只有匹配“”的

php 正则怎么匹配“/”,网络上只有匹配“”的


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