如何检查时间字符串（没有日期部分）是否为H：i：s格式的php

Question

I have time strings as follows

8:7:9

17:34:38

I want to check if the strings have H:i:s format if I found completely invalid strings like empty,other text values, strings with date part (2017:10:12 18:39:21)

Thanks in Advance..!

Answer 1

Use DateTime to check whether a string matches a specific time format:

if (!DateTime::createFromFormat('H:i:s', '2017-10-08 17:23:30')) {
    // time string does not match the H:i:s format
}

If the string matches the provided format, the result will be a DateTime object. If it doesn't, the result will be a boolean false. So you can easily check for that.