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

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Processing form data without nonce verification.

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In footer ($in_footer) is not set explicitly wp_register_script; It is recommended to load scripts in the footer. Please set this value to `true` to load it in the footer, or explicitly `false` if it should be loaded in the header.

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

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Use of heredoc syntax (<<<) is not allowed; use standard strings or inline HTML instead

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Stylesheets must be registered/enqueued via wp_enqueue_style()

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A function call to __() with texts containing placeholders was found, but was not accompanied by a "translators:" comment on the line above to clarify the meaning of the placeholders.

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

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Missing "License" in Plugin Header. Please update your Plugin Header with a valid GPLv2 (or later) compatible license.