How to Convert HH:MM:SS (or MM:SS) Time Strings to Total Seconds?

Converting Time Strings in HH:MM:SS Format to Seconds

Problem:
How can you convert a time string in the HH:MM:SS format into a flat seconds number? The time string can sometimes be in the format MM:SS only.

Solution:

Method 1: Using Regular Expressions

To convert the time string without splitting it, use the following code:

$str_time = "23:12:95";

$str_time = preg_replace("/^([\d]{1,2})\:([\d]{2})$/", "00::", $str_time);

sscanf($str_time, "%d:%d:%d", $hours, $minutes, $seconds);

$time_seconds = $hours * 3600 + $minutes * 60 + $seconds;

Method 2: Using sscanf()

If regular expressions are not preferred, use the following code:

$str_time = "2:50";

sscanf($str_time, "%d:%d:%d", $hours, $minutes, $seconds);

$time_seconds = isset($seconds) ? $hours * 3600 + $minutes * 60 + $seconds : $hours * 60 + $minutes;

In the second method, check if the seconds variable is set to handle time strings in the MM:SS format correctly.

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