WP Theme Optimizer

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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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The $domain parameter must be a single text string literal. Found: $this->plugin_name

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

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Functions declared in the global namespace by a theme/plugin should start with the theme/plugin prefix. Found: "activate_wpto".

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

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Function "get_current_screen()" requires WordPress 3.1.0, but your plugin minimum supported version is WordPress 3.0.1.

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The plugin name includes a restricted term. Your chosen plugin name - "WP Theme Optimizer" - contains the restricted term "wp" which cannot be used at all in your plugin name.

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No PHP code was found in this file and short open tags are not allowed by this install of PHP. This file may be using short open tags but PHP does not allow them.

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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.