PNG to JPG

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$_GET['convert_png'] not unslashed before sanitization. Use wp_unslash() or similar

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Unescaped parameter $old used in $wpdb->query()\n$old assigned unsafely at line 895.

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Processing form data without nonce verification.

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

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

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

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

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Using __FILE__ for menu slugs risks exposing filesystem structure.

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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: fopen().

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The parameter "FALSE" at position #2 of load_plugin_textdomain() has been deprecated since WordPress version 2.7.0. Use "" instead.

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