Using sleep to add delay or increase execution time

Delay in execution by sleep We can create a delay by using sleep command inside our PHP script. This command sleep will delay the output by seconds specified in sleep command. Here is the syntax.
The above command will create a delay of 25 seconds, the next step of execution will be after the delay of 25 seconds.

Some time while testing our scripts we need to add some delay , here it is useful. Say you want to see maximum script execution time of your server. This setting you can know by increasing the sleep time till the set value of execution time at server.

Let us print the time after a delay of 15 seconds.

Here we will first display the time in hour : minute : second format and then use the php flush command to send the output to browser. Then the sleep command will delay the execution by 15 seconds and then again we will print the server time to see the delay. Here is the code.
echo date('H:i:s');
echo "<br>";
echo date('H:i:s');
Out of the two outputs , second one will return after 15 secs
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