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<?php |
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namespace Jet_Form_Builder\Compatibility; |
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abstract class Base_Compatibility { |
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public static $is_activated = null; |
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public static function is_activated() { |
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if ( is_null( static::$is_activated ) ) { |
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static::$is_activated = static::check(); |
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} |
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return static::$is_activated; |
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} |
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abstract public static function check(); |
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} |
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