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

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Use of a direct database call is discouraged.

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Direct database call without caching detected. Consider using wp_cache_get() / wp_cache_set() or wp_cache_delete().

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It is not necessary to prepare a query which doesn't use variable replacement.

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Detected usage of a possibly undefined superglobal array index: $_POST[$this->slug . '_noncename']. Check that the array index exists before using it.

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$_POST[$this->slug . '_noncename'] not unslashed before sanitization. Use wp_unslash() or similar

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Plugin name "Hide Title" is different from the name declared in plugin header "Post Or Page Hide Title".

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

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

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Tested up to: 4.7 < 7.0. The "Tested up to" value in your plugin is not set to the current version of WordPress. This means your plugin will not show up in searches, as we require plugins to be compatible and documented as tested up to the most recent version of WordPress.