How to get the epoch timestamp in PHP?

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In PHP, how to get the epoch timestamp, the number of seconds passed since the epoch?

In PHP, you can use the time() function.

ts = time();

To get the microsecond together too as a float number, use the microtime(true) function.

ts2 = microtime(true);

Example:

$ php -a
Interactive shell

php > echo time() . PHP_EOL;
1491473013
php > echo microtime(true) . PHP_EOL;
1491473017.2061
php > 

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