PHP regular expression method to verify specific holidays

PHP is a general-purpose open source scripting language that is widely used in server-side web development. In web development, correct data validation and format control are an important part of ensuring application quality and security. In terms of holiday determination, PHP's regular expressions are very practical. We can use regular expressions to determine whether the current date is a specific holiday. In this article, we will introduce how to use PHP regular expressions to verify specific holidays.

Step 1: Get the current date

To get the current date in PHP, you can use the date() function. The first parameter of this function is the date format and the second parameter is an optional timestamp. We use the default value, which is the current timestamp.

$today = date("Y-m-d"); //获取当前日期

Step 2: Write a regular expression

Before judging a specific holiday, we need to write a regular expression that matches the date format of the holiday. The following is the matching regular expression for the Spring Festival date:

$chunjie_regex = "/^(19|20)d{2}-(0?[1-9]|1[0-2])-([1-2][0-9]|3[0-1])$/";

The symbols in the regular expression have the following meanings:

• ^: The start mark of the regular expression.
• (19|20)d{2}: Matches the year 19xx or 20xx.
• -: Matches horizontal bars.
• (0?[1-9]|1[0-2]): Matches the months 01-12.
• -: Matches horizontal bars.
• (1-2|3[0-1]): Matches days 01-31.
• $: The end mark of the regular expression.

According to this regular expression, we can match the strings "2022-02-01" and "2023-01-27" with the Spring Festival date.

Step 3: Determine whether the current date is a specific holiday

We use regular expressions to determine whether the current date is a specific holiday. Taking the Spring Festival as an example, if the current date matches the above regular expression, it means that the current date is the Spring Festival.

if(preg_match($chunjie_regex, $today)) {
    echo "今天是春节！";
}

In the above code, we use the preg_match() function to determine whether the current date matches the regular expression. If there is a match, return 1; otherwise return 0. Therefore, we can use the if statement to determine whether the current date is a specific holiday.

In summary, we can use PHP regular expressions to verify specific holidays through the above steps. As needed, we can write regular expressions that match other holidays, such as Valentine's Day, National Day, etc. However, when writing regular expressions, you need to pay attention to the format and range of holiday dates to ensure matching accuracy.

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