Admin Columns for ACF Fields

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

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Processing form data without nonce verification.

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The "acf/admin" prefix is not a valid namespace/function/class/variable/constant prefix in PHP.

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Classes declared by a theme/plugin should start with the theme/plugin prefix. Found: "FleiACFAdminColumns".

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

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Detected usage of a non-sanitized input variable: $_GET['s']

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

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strip_tags() is discouraged. Use the more comprehensive wp_strip_all_tags() instead.

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Your plugin has a different license declared in the readme file and plugin header. Please update your readme with a valid GPL license identifier.

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