Ecomail

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

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

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load_plugin_textdomain() has been discouraged since WordPress version 4.6. When your plugin is hosted on WordPress.org, you no longer need to manually include this function call for translations under your plugin slug. WordPress will automatically load the translations for you as needed.

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Detected usage of meta_key, possible slow query.

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Detected usage of a non-sanitized input variable: $_POST['ecomail_subscription_nonce']

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

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$_POST['ecomail_subscription_nonce'] not unslashed before sanitization. Use wp_unslash() or similar

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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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The "/vendor" directory using composer exists, but "composer.json" file is missing.