gppa-wpml-current-language-choices.php: Automatically filter posts by current WPML language.

gp-populate-anything/gppa-wpml-current-language-choices.php

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+<?php
+/**
+ * Gravity Perks // Populate Anything // WPML Current Language Choices
+ * https://gravitywiz.com/documentation/gravity-forms-populate-anything/
+ *
+ * With WPML you can create multiple versions of posts each with their own language.
+ * When populating posts with Populate Anything, there's no way to identify the current
+ * language and filter by that language with the existing UI. This snippet automatically
+ * filters posts by the current language.
+ *
+ * Instructions:
+ * 1. [Install the snippet.](https://gravitywiz.com/documentation/managing-snippets/#where-do-i-put-snippets)
+ * 2. Add the CSS class `wpml-limit-to-current-language` to any GPPA-enabled field you want filtered.
+ * 3. Populate that field with posts; the snippet filters choices to the current WPML language.
+ */
+add_filter( 'gppa_input_choices', 'hb_wpml_limit_gppa_choices_to_current_language', 10, 4 );
+
+function hb_wpml_limit_gppa_choices_to_current_language( $choices, $field, $objects, $field_values ) {
+	// Ensure WPML is active.
+	if ( ! function_exists( 'icl_object_id' ) ) {
+		return $choices;
+	}
+
+	// Only apply filtering if the marker CSS class is present.
+	$css_class = isset( $field->cssClass ) ? $field->cssClass : '';
+	if ( strpos( $css_class, 'wpml-limit-to-current-language' ) === false ) {
+		return $choices;
+	}
+
+	// Get current WPML language (e.g. 'nl', 'en').
+	$current_lang = apply_filters( 'wpml_current_language', null );
+	if ( ! $current_lang ) {
+		return $choices;
+	}
+
+	$filtered_choices = array();
+
+	foreach ( $choices as $index => $choice ) {
+		$post_id   = 0;
+		$post_type = null;
+
+		// Preferred: WP_Post object from $objects array.
+		if ( isset( $objects[ $index ] ) && $objects[ $index ] instanceof WP_Post ) {
+			$post_id   = $objects[ $index ]->ID;
+			$post_type = $objects[ $index ]->post_type;
+		}
+
+		// Fallback: use the choice value as post ID.
+		if ( ! $post_id && isset( $choice['value'] ) ) {
+			$post_id = absint( $choice['value'] );
+
+			if ( $post_id && ! $post_type ) {
+				$post_obj  = get_post( $post_id );
+				$post_type = $post_obj ? $post_obj->post_type : null;
+			}
+		}
+
+		// If we can resolve a post and post type, apply WPML language check.
+		if ( $post_id && $post_type ) {
+			// Convert the post type to a WPML element type, e.g. 'post_post'.
+			$element_type = apply_filters( 'wpml_element_type', $post_type );
+
+			// Get the language code for this specific element.
+			$choice_lang = apply_filters(
+				'wpml_element_language_code',
+				null,
+				array(
+					'element_id'   => $post_id,
+					'element_type' => $element_type,
+				)
+			);
+
+			// If WPML knows the language and it does not match the current language, skip this choice.
+			if ( $choice_lang && $choice_lang !== $current_lang ) {
+				continue;
+			}
+		}
+
+		// Keep the choice.
+		$filtered_choices[] = $choice;
+	}
+
+	return $filtered_choices;
+}