Do you know how to use the die() and sleep() functions in PHP?

In the previous article "Two examples explain how to delete commas and trailing slashes in strings in PHP" I introduced to you how to delete commas and trailing slashes in strings in PHP. Interested friends can go and learn about it~

This article will also explain the title "Usage of die() and sleep() functions in PHP" through examples.

1. About the usage of die() function

die() is a built-in function in PHP. It is used to print a message and exit the current php script. Equivalent to the exit() function in PHP.

The syntax is very simple, such as "die($message)"

die() function only accepts one parameter, and it is not a parameter that must be passed.

The $message parameter indicates the message to be printed when exiting the script.

And note that die() has no return value, but prints the given message when exiting the script.

Note: This function is applicable to all PHP4 and above versions.

The example of using die function is as follows:

<?php
$site = "";
fopen($site, "r")
or die("无法连接到指定站点");

Output:

无法连接到给定站点

2. About the usage of sleep() function

sleep() is also a built-in function of PHP. It is used to delay the execution of a program for a given number of seconds.

The syntax is "int sleep(int $seconds)";

This function also only accepts one parameter, and the parameter must be passed.

The $seconds parameter represents the delay time in seconds.

Return value: Return zero on success, return FALSE on error. If the call is interrupted by a signal, this function will return a non-zero value.

Note: This function generates E_WARNING when the number of seconds is negative, and this function is suitable for 4.

Usage example of sleep() function:

<?php

// 初始时间
echo date(&#39;h:i:s&#39;) . "<br>";

// 暂停5秒
sleep(5);
// 输出
echo date(&#39;h:i:s&#39;);

Output:

09:28:30 
09:28:35

You can see that the time after pause (sleep) is 5 more than the time before pause (sleep) Second.

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