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}

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/**

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* Get all fields for the instantiated form Id

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* Stored as $this->fields for additional use w/o calling DB

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protected function getFields() {

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if (empty($this->fields)) {

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$this->fields = Ninja_Forms()->form($this->formId)->get_fields();

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}

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// not needed internally, but available for public/static use

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return $this->fields;

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}

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/**

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* Convert Unix date stamp to Wordpress post date format

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* @param int|null $incoming

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* @return string

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protected function formatDate(/* ?int */$incoming = null)/* :string */ {

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$return = $incoming;

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if (!is_null($incoming)) {

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$wpDateFormat = 'Y-m-d';

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// @TODO: remove integer casting when adding type hinting

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$return = date($wpDateFormat, (int) $incoming);

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}

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return $return;

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}

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/**

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* Set field types to be removed before output

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* Provided as indexed array of NF field types

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* @param array $hidden

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public function setHiddenFieldTypes(array $hidden=null)/*: SubmissionCollectionInterface*/ {

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$this->hiddenFieldTypes = $hidden;

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return $this;

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}

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}

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