Open Graph Protocol Framework

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

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Hook names invoked by a theme/plugin should start with the theme/plugin prefix. Found: "excerpt_length".

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wp_cache_reset() has been deprecated since WordPress version 3.5.0. Use wp_cache_switch_to_blog() instead.

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Detected usage of a non-sanitized input variable: $_SERVER['HTTP_HOST']

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

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$_SERVER['HTTP_HOST'] not unslashed before sanitization. Use wp_unslash() or similar

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The $domain parameter must be a single text string literal. Found: OPEN_GRAPH_PROTOCOL_PLUGIN_DOMAIN

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