Heureka

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Global variables defined by a theme/plugin should start with the theme/plugin prefix. Found: "$__composer_autoload_files".

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Hook names invoked by a theme/plugin should start with the theme/plugin prefix. Found: "'wc_membership_plan_options_' . $this->tab['target']".

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

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

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date() is affected by runtime timezone changes which can cause date/time to be incorrectly displayed. Use gmdate() instead.

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Using cURL functions is highly discouraged. Use wp_remote_get() instead.

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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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Hook names invoked by a theme/plugin should start with the theme/plugin prefix. Found: "$this->feed_name() . '_feed_data'".

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trigger_error() found. Debug code should not normally be used in production.

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File operations should use WP_Filesystem methods instead of direct PHP filesystem calls. Found: fclose().

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File operations should use WP_Filesystem methods instead of direct PHP filesystem calls. Found: fwrite().

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The $context parameter must be a single text string literal. Found: $this->get_post_type_key()

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File operations should use WP_Filesystem methods instead of direct PHP filesystem calls. Found: fopen().

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unlink() is discouraged. Use wp_delete_file() to delete a file.

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Use of the backtick operator is forbidden