Counter live visitors for WooCommerce

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Short PHP opening tag used with echo; expected "<?php echo $is_live ..." but found "<?= $is_live ..."

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

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Global variables defined by a theme/plugin should start with the theme/plugin prefix. Found: &quot;$base_url&quot;.

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Use placeholders and $wpdb-&gt;prepare(); found interpolated variable {$this-&gt;table_name} at FROM {$this-&gt;table_name}\n

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Processing form data without nonce verification.

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

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Processing form data without nonce verification.

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Function "determine_locale()" requires WordPress 5.0.0, but your plugin minimum supported version is WordPress 4.3.0.

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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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Missing $domain parameter in function call to __().