How to Convert HH:MM:SS Time to Total Seconds in PHP?

Converting Time in HH:MM:SS Format to Seconds

Converting time in HH:MM:SS format to a flat seconds number is a common task in programming. This can be achieved using a straightforward procedure.

Solution:

There are two approaches to this conversion:

Approach 1: Using Regular Expressions

1. Add leading zeros to the MM:SS format if it exists. This can be done using regular expressions:

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

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2. Extract hours, minutes, and seconds using sscanf:

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

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3. Calculate seconds by multiplying hours by 3600, minutes by 60, and adding the seconds.

Approach 2: Without Regular Expressions

For time in MM:SS format, use the following:

sscanf($str_time, "%d:%d:%d", $hours, $minutes, $seconds);
$time_seconds = isset($seconds) ? $hours * 3600 + $minutes * 60 + $seconds : $hours * 60 + $minutes;

For time in HH:MM:SS format, directly extract hours, minutes, and seconds using sscanf:

sscanf($str_time, "%d:%d:%d", $hours, $minutes, $seconds);
$time_seconds = $hours * 3600 + $minutes * 60 + $seconds;

Example Usage:

$str_time = "23:12:95";
$time_seconds = $hours * 3600 + $minutes * 60 + $seconds;
echo $time_seconds; // Output: 83575

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