Which function is used for php pop-up box?

Which function does php pop-up box use?

php does not have a pop-up box function. It is a server script language, not Ability to control browser BOM objects.

So the pop-up box needs to be implemented using JavaScript. You can use php to output JavaScript code to pop up the warning box.

The code is as follows:

<?php
    echo "<script>alert(&#39;提示内容&#39;)</script>";
?>

The effect is as follows:

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