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Okay, let's dive into the world of PHP and how to calculate time differences in minutes. This tutorial will cover various approaches, considerations for different date/time formats, and provide detailed code examples.

*Understanding the Basics: Time in PHP*

Before we get to the calculations, it's crucial to understand how PHP represents time internally. PHP predominantly uses the Unix timestamp – a numerical representation of the number of seconds that have elapsed since the Unix epoch (January 1, 1970, 00:00:00 Coordinated Universal Time (UTC)).

PHP provides functions to convert dates and times into Unix timestamps, perform calculations on them, and format them back into human-readable formats.

*Methods for Calculating Time Differences in Minutes*

Here are several approaches to calculating time differences in minutes in PHP, ranked by their generally preferred usage (especially when dealing with more complex scenarios):

1. *Using `DateTime` Objects (Recommended)*

The `DateTime` class in PHP is the most robust and recommended way to handle dates and times. It offers a clear object-oriented approach and handles timezones gracefully.

*Steps:*

1. Create `DateTime` objects from your dates/times.
2. Use the `diff()` method to get a `DateInterval` object.
3. Extract the number of minutes from the `DateInterval`.

*Code Example:*



*Explanation:*

`new DateTime($datetime1_str)`: Creates `DateTime` objects from the input strings. The constructor automatically tries to parse the string.
`$datetime1-diff($datetime2)`: Calculates the difference between the two dates and returns a `DateInterval` object. The order is important; it's `$datetime1` minus `$datetime2`. If you want the absolute difference, ensure `$datetime1` is earlier than `$datetime2`.
`$interval-days`, `$interval-h`, `$interval-i`: Access the days, hours, and minutes components of the interval.
`$minu ...

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