Linker – URL shortener & track outbound link clicks

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

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Processing form data without nonce verification.

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

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

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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.

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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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load_plugin_textdomain() has been discouraged since WordPress version 4.6. When your plugin is hosted on WordPress.org, you no longer need to manually include this function call for translations under your plugin slug. WordPress will automatically load the translations for you as needed.

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Detected usage of meta_key, possible slow query.

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Resource version not set in call to wp_enqueue_style(). This means new versions of the style may not always be loaded due to browser caching.