Discuss the usage and examples of PHP confirm

Confirm in PHP is used to obtain the user's confirmation and perform corresponding operations based on the user's selection. In this article, we will explore the usage of confirm and its examples.

What is confirm?

confirm() is one of the JavaScript functions used to display a dialog box to the user and ask the user whether to confirm performing a certain operation. Dialog boxes usually display two buttons: OK and Cancel. When the user clicks the OK button, the confirm() function will return a true value, otherwise it will return a false value.

How to use confirm

The syntax of the confirm() function is as follows:

confirm(message)

Among them, message is a string value used to prompt information to the user and ask the user whether Perform operations.

For example, we can use the following code to implement a simple confirm function:

<script type="text/javascript">
function deleteItem(id) {
if(confirm("您确定要删除该项吗？")) {
//执行删除操作
}
}
</script>

In the above code, when the user clicks the delete button, a dialog box will pop up, prompting the user to confirm whether to delete the item . If the user clicks OK, the delete operation will be performed; if the user clicks Cancel, no operation will be performed.

Practical application of confirm

Let's look at a practical application scenario. Suppose we want to implement a message board system in a web page, and users can leave messages on the message board.

We can use the following code to achieve this:

<?php
if(isset($_POST[&#39;submit&#39;])) {
$username = $_POST[&#39;username&#39;];
$message = $_POST[&#39;message&#39;];
if(!empty($username) && !empty($message)) {
//插入留言到数据库中
echo "<script>alert('留言成功！');</script>";
} else {
echo "<script>alert('请输入姓名和留言内容！');</script>";
}
}
?>

<form method="post" action="">
<label for="username">姓名：</label>
<input type="text" name="username" id="username"><br>
<label for="message">留言内容：</label>
<textarea name="message" id="message" cols="30" rows="10"></textarea><br>
<input type="submit" name="submit" value="提交留言" onclick="return confirm(&#39;您确定要提交留言吗？&#39;)">
</form>

In the above code, we use the confirm() function. When the user clicks the submit message button, a dialog box will pop up to prompt the user to confirm. Submit Message. If the user clicks OK, the form submission operation will be performed and the message will be inserted into the database; if the user clicks Cancel, no operation will be performed.

Summary

In PHP, the confirm() function is a very useful function that can help us implement user interaction functions. By using the confirm() function, we can easily obtain the user's confirmation and perform corresponding operations based on the user's selection. In actual development, we should flexibly apply the confirm function according to specific application scenarios to provide users with a better experience.

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