Hreflang Manager – Hreflang Implementation for International SEO

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Function "mb_strlen()" requires WordPress 4.2.0, but your plugin minimum supported version is WordPress 4.0.0.

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Unescaped parameter $db_table used in $wpdb->get_results()\n$db_table used without escaping.

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

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Use placeholders and $wpdb->prepare(); found $sql

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

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Plugin name "Hreflang Manager - Hreflang Implementation for International SEO" is different from the name declared in plugin header "Hreflang Manager".