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Failing Script since upgrade to PHP8.2

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Mar 05.2024

Deprecated: Constant FILTER_SANITIZE_STRING is deprecated in /home2/folder/script.php on line 20

$POST = filter_var_array($_POST, FILTER_SANITIZE_STRING);

I think do $POST[‘myfield’]

What’s wrong and how to I work around this?

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PHP

2 Replies

Davinci•003 auto-replyPHP 8.2 introduced several changes and deprecations that might cause older scripts to fail. Here are a few steps you can take to debug your script:

1. **Enable Error Reporting**: The first step in debugging your PHP script is to enable error reporting. This can be done by adding the following lines at the top of your script:

``php
ini_set('display_errors', 1);
ini_set('display_startup_errors', 1);
error_reporting(E_ALL);
``

2. **Check Deprecated Functions**: PHP 8.2 has deprecated several functions. If your script uses any of these, you'll need to replace them with their newer counterparts. You can find a list of these deprecated functions in the PHP 8.2 migration guide.

3. **Check for Type Errors**: PHP 8.2 has introduced a stricter type system. If your script was relying on PHP's loose typing, it might now fail. Check your script for type errors.

4. **Check for Removed Extensions**: Some extensions have been removed in PHP 8.2. If your script relies on any of these, you'll need to find a replacement.

5. **Check for Changes in Default Error Reporting Level**: PHP 8.2 has changed the default error reporting level. If your script was relying on the old level, it might now fail.

If you're still having trouble, please provide the specific error message you're seeing, and I'll be happy to help further.

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@songchuwenApr 28.2024 — The warning you're seeing indicates that the constant FILTER_SANITIZE_STRING is deprecated, meaning it's no longer recommended for use in PHP because there may be better alternatives or it might be removed in future versions. To address this, you can switch to a different sanitization method or use a custom filter.

Here's how you can work around this issue:

1,Use Specific Sanitization Filters: Instead of using FILTER_SANITIZE_STRING, you can use more specific sanitization filters depending on the type of data you're expecting. For example, if you're expecting email addresses, you can use FILTER_SANITIZE_EMAIL, or if you're expecting integers, you can use FILTER_SANITIZE_NUMBER_INT.

2,Custom Sanitization: If none of the predefined filters suit your needs, you can create a custom sanitization function to sanitize the input data according to your requirements.

Here's an example of how you can sanitize the $_POST['myfield'] data using a custom function:
xxxxxx.php
function customSanitize($input) {
// Implement your custom sanitization logic here
// For example, you can use htmlspecialchars to escape HTML characters
return htmlspecialchars($input);
}

// Sanitize the $_POST['myfield'] using the custom function
$sanitizedValue = customSanitize($_POST['myfield']);
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In this example, customSanitize is a function that performs custom sanitization on the input data. You can replace htmlspecialchars with any other sanitization function or logic that suits your needs.

Remember to always validate and sanitize user input to prevent security vulnerabilities such as cross-site scripting (XSS) attacks and SQL injection.
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