Example of how to convert time text into timestamp in PHP

PHP is a very popular server-side scripting language that supports a variety of data types and functions, among which time types are often used. In practical applications, we may need to convert time text into timestamps for processing. This article will introduce how to use PHP to implement this function.

1. Convert time text to timestamp

In PHP, you can convert time text into timestamp through the strtotime() function. The common format of this function is:

strtotime(string $time [, int $now = time() ])

Among them, $time is the time text that needs to be converted, $now is an optional parameter, indicating the current time used during conversion, and the default value is the time returned by the time() function. The current UNIX timestamp.

The following is a simple sample code:

<?php
$timeStr = &#39;2021-06-01 12:00:00&#39;; // 时间文本
$timestamp = strtotime($timeStr); // 转换成时间戳
echo $timestamp;
?>

The output result is: 1622539200

2. Conversion of other time text formats

In addition to the commonly used "year-month-day hour:minute:second" format, the strtotime() function also supports the conversion of other time text formats. Here are several commonly used formats and their corresponding sample codes:

1. Relative time format

The relative time format refers to "/- digital year/month/week/day/hour/minute/second", where '/-' means taking the current time Add/subtract, the number indicates the amount of time to add or subtract, and the year/month/week/day/hour/minute/second respectively indicates the time unit that needs to be adjusted. For example, the following code will return the timestamp one hour before the current timestamp:

<?php
$timestamp = strtotime(&#39;-1 hour&#39;);
echo $timestamp; 
?>

2. English text format

The strtotime() function also supports time text expressed in English , for example, "now" represents the current time, "yesterday" represents yesterday, and English month and week names can also be used, such as "June 1, 2021" represents June 1, 2021. The following is a sample code:

<?php
$timestamp = strtotime(&#39;June 1, 2021&#39;);
echo $timestamp;
?>

3. Dealing with time zone issues

When using PHP’s date and time functions, you need to pay attention to time zone issues. If you do not specify a time zone, PHP will use the server's default time zone. If you need to use other time zones, you can use the date_default_timezone_set() function to set the time zone, for example:

<?php
date_default_timezone_set(&#39;Asia/Shanghai&#39;); // 设置时区为上海
$timeStr = &#39;2021-06-01 12:00:00&#39;; // 时间文本
$timestamp = strtotime($timeStr); // 转换成时间戳
echo $timestamp;
?>

IV. Summary

This article introduces how to use PHP to convert time text into a timestamp, and Some other methods of converting time text formats and considerations for dealing with time zone issues. Proficient in these skills, you can deal with time-related issues in PHP development and improve development efficiency.

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