How to convert string to timestamp in php

php method to convert a string into a timestamp (timestamp): 1. Use the strtotime() function to parse the date and time description of any English text into a timestamp; 2. Use the mktime() function, Used to get a timestamp from a date, returning the timestamp successfully, otherwise returning FALSE.

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

php string conversion For timestamp

PHP provides functions that can easily convert various forms of dates into timestamps. The main functions of this type are:

• strtotime(): Parse any English text datetime description into a timestamp.
• mktime(): Get timestamp from date.

strtotime()

strtotime() function is used to convert the date represented by the English text string into a timestamp. It is the inverse function of date() and returns the timestamp successfully. Otherwise return FALSE. Syntax:

int strtotime ( string time [, int now] )

The parameter time is the parsed string, which is the date represented according to the GNU date input format.

Example:

<?php
echo strtotime("2021-05-14 16:00:10")."<br>";    //输出 1620979210
echo strtotime("10 September 2021")."<br>";    //输出 1631203200
echo strtotime("+1 day"), "<br />"."<br>";    //输出明天此时的时间戳 
?>

mktime()

mktime() function is used to get the timestamp from the date, and returns the timestamp successfully, otherwise it returns FALSE. Syntax:

int mktime(时, 分, 秒, 月, 日, 年)

<?php
echo mktime(21, 50, 55, 07, 14, 2021);        //输出“1626270655”
?>

Parameters can be omitted from right to left. Any omitted parameters will be set to the current value of the local date and time.

mktime() is useful for doing date calculations and validation, it will automatically calculate the correct value for out-of-range input. For example, the following example outputs 2008-01-01:

<?php
echo date("Y-m-d", mktime(0, 0, 0, 12, 32, 2021));
echo date("Y-m-d", mktime(0, 0, 0, 13, 1, 2021));
?>

The last day of the next month. The last day of any given month can be represented as the "0" day of the next month instead of -1, as in the following example:

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);
$lastday = mktime(0, 0, 0, 3, 0, 2021);
echo strftime("2021年最后一天是:%d", $lastday);
// 2021年最后一天是：28
?>

Custom Function

Below The function is similar to strtotime.

<?php
$date_str = "2021-05-14 17:00:00";
echo $time_str = str_format_time($date_str);

function str_format_time($timestamp = &#39;&#39;)
{   
    if (preg_match("/[0-9]{4}-[0-9]{1,2}-[0-9]{1,2} (0[0-9]|1[0-9]|2[0-3]):([0-5][0-9]):([0-5][0-9])/i", $timestamp)) 
    {
        list($date,$time)=explode(" ",$timestamp);
        list($year,$month,$day)=explode("-",$date);
        list($hour,$minute,$seconds )=explode(":",$time);
         $timestamp=gmmktime($hour,$minute,$seconds,$month,$day,$year);
    }
    else
    {
        $timestamp=time();
    }
    return $timestamp;
}

echo &#39;<br />&#39;;
echo date("Y-m-d H:i:s", $time_str);

?>

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