检查变量是否是PHP的有效日期 [英] Check if variable is a valid date with PHP

问题描述

我正在处理一个脚本，它会从CSV文件导入一些数据。当我这样做，我想能够检查一个变量，看看它是否是一个有效的日期字符串。

I am working on a script that will import some data from a CSV file. As I am doing this I want to be able to check a variable to see if it is a valid date string.

我已经看到几种方法来检查刺痛是否是一个日期，但是大部分都需要你现在的格式。我不会知道日期的格式。

I have seen several ways to check if a sting is a date, but most of them require you to now the format. I will not know the format that the date will in.

现在我正在使用strtotime（），但这不能轻松地

right now I am using strtotime(), but this fails to easily

$field ="May";
if(strtotime($field)){
    echo "This is a date";
}

在这种情况下，May是人名，而不是日期。

In this case, "May" was the persons first name, and not a date at all.

任何人都可以推荐更可靠的功能？

Can any one recommend more reliable function?

根据您的一些人的问题编辑

在我的情况下作为日期通过，它将需要具体到一个/每月/年，所以只是五月将是模糊的。

For a variable to pass as a "date" in my case, it would need to be specific to a day/month/year, so just "May" would be to vague to count.

根据以下的Pauls好点，我们还可以测试字符串是否包含一个数字，例如

Based on that and Pauls good point below we can also test to see if the string contains a number, such as

$field ="May";
if(strtotime($field) && 1 === preg_match('~[0-9]~', $field)){
    echo "This is a date";
}else{
    echo "Nope not a date";
}

这似乎涵盖了我的即时需求，但任何人都可以发现任何问题或建议改进？

This seems to cover my immediate needs, but can any one spot any issues or suggest improvements?

推荐答案

使用 date_parse 并检查返回的数组的值

Use date_parse and check the values of the returned array

$date = date_parse("May")

// ["year"] == FALSE
// ["month"] == 5
// ["day"] == FALSE

你也可以将它们传递到 checkdate 。

You can also pass those into checkdate.

$date = date_parse($someString);
if ($date["error_count"] == 0 && checkdate($date["month"], $date["day"], $date["year"]))
    echo "Valid date";
else
    echo "Invalid date";

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