Fixed And Sticky Header

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All output should be run through an escaping function (see the Security sections in the WordPress Developer Handbooks), found '$myplugins_options["class-addbackgroundcolor-fx"]'.

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All output should be run through an escaping function (like esc_html_e() or esc_attr_e()), found '_e'.

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The $text parameter must be a single text string literal. Found: $myplugins_options['class-addbackgroundcolor-fx']

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Missing $domain parameter in function call to _e().

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Mismatched text domain. Expected 'fixed-and-sticky-header' but got 'myfixedsticky-fxx'.

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Detected usage of a non-sanitized input variable: $_GET['instruct']

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$_GET['instruct'] not unslashed before sanitization. Use wp_unslash() or similar

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Processing form data without nonce verification.

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Detected usage of a possibly undefined superglobal array index: $_POST['nonceAmountoftime']. 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;