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//need to add a box for the company URL
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add_action( 'save_post', '143600_save_box' );
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//create the metabox
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function wpse_143600_add_box() {
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    add_meta_box( 
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        'related_testimonial',
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        __( 'community', 'wpse_143600_translation' ),
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        __( 'Testimonails', 'wpse_143600_translation' ),
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        'testimonial',
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        'locations',
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  'normal'
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	'normal'
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}
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//build the box
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function wpse_143600_testimonial_box($post) {
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    wp_nonce_field( basename( __FILE__ ), 'wpse_143600_nonce' );
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    $wpse_143600_stored_meta = get_post_meta( $post->ID );
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    $testimonialArgs = array(
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  'post_type' => 'community',
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	'post_type' => 'testimonials',
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  'post_status' => 'publish',
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	'post_status' => 'publish',
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  'numberposts' => -1
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	'numberposts' => -1
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    $testimonials = get_posts($testimonialArgs);
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    if($testimonials): ?>
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    <p>
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      <label for="meta-select" class="wpse_143600-row-title"><?php _e( 'Example Select Input', 'wpse_143600_translation' )?></label>
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      <select name="meta-select" id="meta-select">
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        <option value="NULL">Please choose a testimonial…</option>
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    <?php foreach($testimonials as $testimonial): ?>
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        <option value="<?php echo $testimonial->ID; ?>" <?php if ( isset ( $wpse_143600_stored_meta['meta-select'] ) ) selected( $wpse_143600_stored_meta['meta-select'][0], $testimonial->ID ); ?>><?php echo $testimonial->post_title; ?></option>
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    <?php endforeach; ?>
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      </select>
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    </p>    
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    <?php
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    else:
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    ?>
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  <p>There are no testimonials - please save this post, and write some testimonials. You'll then be able to choose a testimonial for this location.</p>
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	<p>There are no testimonials - please save this post, and write some testimonials. You'll then be able to choose a testimonial for this location.</p>
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    endif;
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}
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//save the box
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function wpse_143600_save_box( $post_id ) {
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    $is_autosave = wp_is_post_autosave( $post_id );
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    $is_revision = wp_is_post_revision( $post_id );
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    $is_valid_nonce = ( isset( $_POST[ 'wpse_143600_nonce' ] ) && wp_verify_nonce( $_POST[ 'wpse_143600_nonce' ], basename( __FILE__ ) ) ) ? 'true' : 'false';
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    // Exits script depending on save status
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    if ( $is_autosave || $is_revision || !$is_valid_nonce ) {
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        return;
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    }
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    // Checks for input and saves if needed
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    if( isset( $_POST[ 'meta-select' ] ) ) {
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      update_post_meta( $post_id, 'meta-select', $_POST[ 'meta-select' ] );
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	update_post_meta( $post_id, 'meta-select', $_POST[ 'meta-select' ] );
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}