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Detected usage of a non-sanitized input variable: $_POST['pplb_button_class']

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$_POST['pplb_button_class'] not unslashed before sanitization. Use wp_unslash() or similar

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All output should be run through an escaping function (see the Security sections in the WordPress Developer Handbooks), found '$expire'.

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Functions declared in the global namespace by a theme/plugin should start with the theme/plugin prefix. Found: "activate_pplb".

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Global variables defined by a theme/plugin should start with the theme/plugin prefix. Found: "$expire".

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Processing form data without nonce verification.

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Detected usage of a possibly undefined superglobal array index: $_POST['pplb_button_class']. Check that the array index exists before using it.

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PHP file should prevent direct access. Add a check like: if ( ! defined( 'ABSPATH' ) ) exit;

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Function "get_queried_object_id()" requires WordPress 3.1.0, but your plugin minimum supported version is WordPress 2.8.0.

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wp_redirect() found. Using wp_safe_redirect(), along with the "allowed_redirect_hosts" filter if needed, can help avoid any chances of malicious redirects within code. It is also important to remember to call exit() after a redirect so that no other unwanted code is executed.