Validate that input is in this time format - “HH:MM” [closed]

Answer 1

Another approch without using regex.

if(is_string($foo)  && (strlen($foo) == 4 || strlen($foo) == 5) && intval(str_replace(':','',$foo)) > -1 && intval(str_replace(':','',$foo)) < 2360){
    stuff to do if valid time
}
else{
    stuff to do if invalid time
}

First of all I check if the datatype is string. If not it obvious that it is not a valid time. Then I check if the string has the right lenght of 4 / 5 letters. With str_replace I remove the ':' and then cast the result to an integer which I could easily compare to the desired time range (in my example 00:00 - 23:59).