Php security

Question

Hello guys and ladies I'm a beginner PHP developer and I have created my own CMS and I use this code to prevent vulnerabilities:
Function escape($data){
$data = trim($data);
$data = stripslashes($data);
$data = htmlspecialchars($data);
$data = mysqli_real_escape_string($data);
return $data;
}
And Everytime I receive data I use this function to avoid from SQL injection, XSS and Other vulnerabilities.
Please help me make it better and say your opinion.

Answer 1

To prevent embedding of HTML tags:

https://www.w3schools.com/php/func_string_strip_tags.asp

Answer 2

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