Workaround to get array_column() working for older PHP Versions in Bolder Surveys Plugin (http://codecanyon.net/item/bolder-surveys-for-wordpress). The file you need to edit is located under bolder-surveys/includes/admin/class-statistics-survey.php.

class-statistics-survey.php

<?php

if ( ! defined( 'ABSPATH' ) ) {
    exit; // Exit if accessed directly
}

class Bolder_Survey_Statistics_Single {

    /*
     * Survey ID
     */
    public $survey_id;

    /*
     * Pie Charts var
     */
    public $pie_charts;

    /*
     * Current Theme Colors array
     */
    public $theme_colors;


    function __construct( $survey_id ){
        global $status, $page, $_wp_admin_css_colors;

        $this->theme_colors = $_wp_admin_css_colors[ get_user_option( 'admin_color' ) ]->colors;

        $this->survey_id = $survey_id;

        $this->pie_charts = array();
    }


    /**
    * Display page for individual survey statistics
    */
    function display() {
        $survey_id = $this->survey_id;
        $participants_q = $this->get_participants( $this->survey_id );
        $participants = ( empty( $participants_q ) ) ? 0 : count( $participants_q );
        $date_start = get_post_meta( $survey_id, 'date_start', true );
        $date_end = get_post_meta( $survey_id, 'date_stop', true );
?>
<div class="wrap">
<h1><?php _e( 'Bolder Survey Statistics', 'bolder-surveys' ); ?>: <?php echo get_the_title( $survey_id ); ?>
    <a href="<?php echo admin_url( 'edit.php?post_type=bolder-surveys&page=survey-statistics' ); ?>" class="page-title-action">&laquo; <?php _e( 'Back to Statistics Homepage', 'bolder-surveys' ); ?></a></h1>

<?php if( isset( $_GET['reset'] ) && sanitize_title( $_GET['reset'] ) == 'successful' ) : ?>
    <div class="message updated"><p><?php _e( 'Statistics for this survey have been successfully reset.', 'bolder-surveys' ); ?></p></div>
<?php endif; ?>

<div id="poststuff">
<div id="post-body" class="columns-2">
<div id="post-body-content" style="position: relative;">
    <div class="bolder-survey-stats">

<?php if( $reset ) : ?>
        <div class="updated">
            <p><?php _e( 'The answers for this survey have been successfully deleted!', 'bolder-surveys' ); ?></p>
        </div>
<?php endif; ?>

        <div class="chart-wrapper">
<?php
        $n = 0;
        $survey_questions = $this->get_questions( $survey_id );
        foreach ($survey_questions as $q) :
            if( $q['type'] == 'headline' || $q['type'] == 'break' ) continue;
            $type = ( $q['type'] == 'grid' ) ? 'table' : 'chart';
?>
            <div class="<?php echo $type; ?> survey-element element-<?php echo $q['type']; ?> stat-question-<?php echo $q['id']; if( $n % 2 ) echo " last"; ?>">
                <?php $this->display_single_question( $q ); ?>
                <br class="clear">
            </div>
<?php
            $n++;
        endforeach;
?>
        </div>
    </div>
</div>
<div id="postbox-container-1" class="postbox-container">
    <div class="survey-info-box">
        <h2 class="element-headline"><?php _e( 'Survey Information', 'bolder-surveys' ); ?></h2>
        <div class="inner">
            <p class="survey-status"><?php $s = $this->get_survey_status( $survey_id ); echo '<span class="' . $s[1] . '">' . $s[0] . '</span>'; ?></p>
            <p>Date Started:<span><?php echo date( 'M j, Y', strtotime( $date_start ) ); ?></span></p>
            <p>Date Ended:<span><?php echo date( 'M j, Y', strtotime( $date_end ) ); ?></span></p>
            <p>Participants:<span><?php echo $participants; ?></span></p>
        </div>
        <div id="major-publishing-actions" class="submitbox">
            <p style="margin: 0;"><a class="submitdelete deletion" href="<?php echo admin_url( 'edit.php?post_type=bolder-surveys&page=survey-statistics&survey_id=' . $survey_id . '&reset=true' ); ?>">Reset Survey Statistics</a></p>
        </div>
    </div>
</div>
<br class="clear">
</div>
</div>
</div>
    <script type="text/javascript">
    <?php $this->generate_chart_js(); ?>
    </script>
<?php
    }


    /**
     * Setup display output for single elements
     */
    function display_single_element( $survey_id, $element_id ) {
?>
<div class="wrap">
<h1><?php _e( 'Bolder Survey Statistics', 'bolder-surveys' ); ?>: <?php echo get_the_title( $survey_id ); ?>
    <a href="<?php echo admin_url( 'edit.php?post_type=bolder-surveys&page=survey-statistics&survey_id=' . absint( $survey_id ) ); ?>" class="page-title-action">&laquo; <?php _e( 'Back to Full Survey Statistics', 'bolder-surveys' ); ?></a></h1>
<div id="poststuff">
<div id="post-body" class="columns-2">
<div id="post-body-content" style="position: relative;">
    <div class="bolder-survey-stats">
<?php
        // retrieve requested element
        $question = $this->get_question( (int) $survey_id, (int) $element_id );

        if( $question ) :
            if( $question['type'] == 'headline' || $question['type'] == 'break' ) continue;
            $type = ( $question['type'] == 'grid' ) ? 'table' : 'chart';
?>
            <div class="<?php echo $type; ?> survey-element element-<?php echo $question['type']; ?> stat-question-<?php echo $question['id']; if( $n % 2 ) echo " last"; ?>">
                <?php $this->display_single_question( $question, true ); ?>
                <br class="clear">
            </div>
<?php
        else :
        endif;
?>
    </div>
</div>
    <script type="text/javascript">
    <?php $this->generate_chart_js(); ?>
    </script>
<?php
    }


    /**
    * Display page for individual survey statistics
    */
    function display_single_question( $question, $single = false ) {
        // exit if question is not found
        if( ! $question || ! is_array( $question ) )
            return;

        $type = ( isset( $question['type'] ) ) ? $question['type'] : 'break';
        $args = unserialize( $question['args'] );
        $question += $args;
        unset( $question['args'] );

        if( $type == 'headline' || $type == 'break' )
            return;
        elseif( $type == 'grid' )
            $this->generate_grid_chart( $question, $single );
        elseif( $type =='question' && ( in_array( $args['question_type'], array( 'text', 'textarea' ) ) ) )
            $this->generate_text_results( $question, $single );
        else
            $this->generate_pie_chart( $question, $single );
    }


    /**
     * Get questions for this survey
     */
    function get_questions( $survey_id ) {
        global $wpdb;

        return $wpdb->get_results( "SELECT * FROM " . $wpdb->prefix . "beSurveys_elements WHERE sid='" . $survey_id . "' ORDER BY order_id ASC", ARRAY_A );
    }

    /**
     * Get question by element id
     */
    function get_question( $survey_id, $element_id ) {
        global $wpdb;

        return $wpdb->get_row( "SELECT * FROM " . $wpdb->prefix . "beSurveys_elements WHERE sid='" . $survey_id . "' AND id='" . $element_id . "' ORDER BY order_id ASC", ARRAY_A );
    }

    /**
    * Retrieve list of all surveys
    */
    function get_survey_list() {
        global $wpdb;

        $args = array(
            'posts_per_page' => -1,
            'post_type' => 'bolder-surveys',
            );
        $sel = get_posts( $args );

        if( count( $sel ) ) return $sel;

        return false;
    }

    /**
    * Retrieve all participants for a given survey
    */
    function get_participants( $survey_id ) {
        global $wpdb;

        $survey_id = absint( $survey_id );
        $sel = $wpdb->get_results( "SELECT * FROM " . $wpdb->prefix . "beSurveys_users WHERE sid='" . $survey_id . "' ORDER BY date DESC", ARRAY_A );

        if( count( $sel ) ) return $sel;

        return false;
    }

    /**
    * Retrieve status for a given survey
    */
    function get_survey_status( $survey_id ) {

        $survey_id = absint( $survey_id );
        $date_start = get_post_meta( $survey_id, 'date_start', true );
        $date_end = get_post_meta( $survey_id, 'date_stop', true );
        $published = get_post_status( $survey_id );

        if( !isset( $date_start ) || !isset( $date_end ) ) return array( 'INVALID', 'error' );

        if( $published != 'publish' )
            return array( 'PENDING', 'notice' );

        $current_date = strtotime('now');
        if( strtotime($date_start) < $current_date && strtotime($date_end) > $current_date )
            return array( 'ACTIVE', 'success' );
        else
            return array( 'INACTIVE', 'notice' );

        return array( 'INVALID', 'error' );
    }

    /**
    * Retrieve all answers for a given element (question)
    */
    function get_element_answers( $element_id ) {
        global $wpdb;

        $element_id = absint( $element_id );
        $sel = $wpdb->get_results( "SELECT * FROM " . $wpdb->prefix . "beSurveys_answers WHERE eid='" . $element_id . "'", ARRAY_A );

        if( count( $sel ) ) return $sel;

        return false;
    }

    /**
    * Display Pie Chart for Individual Question
    */
    function generate_pie_chart( $args, $single = false ) {
        global $Bolder_Survey_Chart_Colors;

        $pieces = array();
        $n = 0;
?>
        <h4><?php echo stripslashes( $args['headline'] ); ?></h4>
        <canvas id="pie-chart-<?php echo $args['id']; ?>" class="pie-chart-canvas" height="250" width="250"></canvas>
<?php if( $args['type'] == 'rating' ) { ?>
        <div class="pie-chart-key">
            <h5>KEY</h5>
            <ul>
<?php
            $results = $this->process_rating_results( $args );
            if( $results ) :
                $total = array_sum( $results );
                foreach ( $results as $value => $count ) {
                    $percent = number_format( ( $count * 100 ) / $total, 2 );
                    if( $n == 5 ) echo "</ul><ul style=\"float:left;\">";
                    echo "\t\t\t<li><span style=\"background:" . $Bolder_Survey_Chart_Colors[ $n ] . "\"></span>" . stripslashes( $value ) . " - " . $percent . "% (" . $count . ")</li>\n";
                    $percent = ( $count * 100 ) / $total;
                    $pieces[] = array( 'value' => $percent, 'color' => $Bolder_Survey_Chart_Colors[ $n ] );
                    $n++;
                    if( $n >= 10 ) $n = 0;
                }
            else : 
                _e( 'No results found.', 'bolder-surveys' );
            endif;
?>
            </ul>
        </div>
<?php
        } elseif ( $args['type'] == 'question' ) {
?>
        <div class="pie-chart-key">
            <h5>KEY</h5>
            <ul>
<?php
            $results = $this->process_question_results( $args );
            if( $results ) :
                $total = 0;
                foreach ( $results as $r )
                    $total += $r['count'];

                foreach ( $results as $value => $count ) {
                    $percent = number_format( ( $count['count'] * 100 ) / $total, 2 );
                    $pieces[] = array( 'value' => $percent, 'color' => $Bolder_Survey_Chart_Colors[ $n ] );
                    echo "\t\t\t<li><span style=\"background:" . $Bolder_Survey_Chart_Colors[ $n ] . "\"></span>" . stripslashes( stripslashes( $count['title'] ) ) . " - " . $percent . "% (" . $count['count'] . ")</li>\n";
                    $n++;
                    if( $n >= 10 ) $n = 0;
                }
            else : 
                _e( 'No results found.', 'bolder-surveys' );
            endif;
?>
            </ul>
        </div>
<?php
        }
        echo '<div class="clear"></div>';
        if( ! $single ) echo '<p class="view-details"><a href="' . admin_url( 'edit.php?post_type=bolder-surveys&page=survey-statistics&survey_id=' . $args['sid'] . '&element=' . $args['id'] ) . '">' . __( 'View Details', 'bolder-surveys' ) . '</a></p>';

        $this->pie_charts[ $args['id'] ] = $pieces;
    }

    /**
    * Display Bar Graph for Individual Question
    */
    function generate_grid_chart( $args, $single = false ) {
        global $wpdb;
        $columns = explode( '|', stripslashes( $args['options-col'] ) );
        $rows = explode( '|', stripslashes( $args['options-row'] ) );
?>
            <div class="grid chart-question-<?php echo $args['id']; ?>">
                <h4><?php echo stripslashes( $args['headline'] ); ?></h4>
                <table id="survey-answers-grid-<?php echo $args['id']; ?>" class="bolder-surveys-admin-table">
                    <thead>
                        <tr>
                            <th>&nbsp;</th>
<?php foreach( $columns as $val_c ) : ?>
                            <th scope="col"><?php echo $val_c; ?></th>
<?php
        endforeach;

        $items = $this->get_element_answers( $args['id'] );
        if( $items ) {
            $results = $this->process_grid_results( $items );
            $for_chart = array();
            $data = "";
        }
?>
                        </tr>
                    </thead>
                    <tbody>
        <?php foreach( $rows as $val_r ) : ?>
                        <tr>
                            <th scope="row"><?php echo $val_r; ?></th>
            <?php foreach( $columns as $val_c ) : $max = max( $results[ sanitize_title( $val_r ) ] ); ?>
                            <td>
                    <?php
                        $r = $results[ sanitize_title( $val_r ) ][ sanitize_title( $val_c ) ];
                        if( isset( $r ) && !is_null( $r ) ) {
                            if( $max == $r ) echo "<span>" . $r . "</span>";
                            else echo $r;
                        } else echo 0;
                    ?>
                            </td>
            <?php endforeach; ?>
                        </tr>
        <?php endforeach; ?>
                    </tbody>
                </table>
            </div>
            <?php if( ! $single ) : ?><p class="view-details"><a href="<?php echo admin_url( 'edit.php?post_type=bolder-surveys&page=survey-statistics&survey_id=' . $args['sid'] . '&element=' . $args['id'] ); ?>"><?php _e( 'View Details', 'bolder-surveys' ); ?></a></p><?php endif; ?>
<?php
    }

    /**
    * Unserialize text question answers and form into single array
    */
    function generate_text_results( $args, $single = false ) {
?>
        <h4><?php echo stripslashes( $args['headline'] ); ?></h4>
<?php
        $n = 0;
        $results = $this->process_text_question_results( $args );
        if( $results ) {

            if( ! $single ) $results = array_splice( $results, 0, 4 );
            $counts = $this->array_column( $results, 'count' );
            $total_counts = array_sum( $counts );

            foreach( $results as $value ) {
                $width = (  $value['count'] / $total_counts ) * 100;
                echo '<p><span><span style="background: ' . $this->theme_colors[2] . '; width: ' . $width . '%;"></span></span>' . $value['answer'] . ' (' . $value['count'] . ')</p>';

                $n++;
            }
        }

        if( ! $single ) :
?>
        <p class="view-details"><a href="<?php echo admin_url( 'edit.php?post_type=bolder-surveys&page=survey-statistics&survey_id=' . $args['sid'] . '&element=' . $args['id'] ); ?>"><?php _e( 'View All Answers', 'bolder-surveys' ); ?></a></p>
<?php
        endif;
    }

    /**
    * Create JS code to generate chart elements
    */
    function generate_chart_js() {

        if( count( $this->pie_charts ) ) {
            foreach ( $this->pie_charts as $id => $args ) {
                echo "\n\tvar Data" . $id . " = [";
                foreach ( $args as $val )
                    echo "{value: " . $val['value'] . ",color:'" . $val['color'] . "'},";
                echo "];\n\tvar myDoughnut = new Chart(document.getElementById('pie-chart-" . $id . "').getContext('2d')).Doughnut(Data" . $id . ")\n";
            }
        }

    }

    /**
    * Unserialize rating answers and form into single array
    */
    function process_rating_results( $rating ) {

        $results = $temp = array();
        $answers = $this->get_element_answers( $rating['id'] );
        foreach ($answers as $value) {
            if( isset( $temp[ $value['answer'] ] ) )
                $temp[ $value['answer'] ]++;
            else $temp[ $value['answer'] ] = 1;
}
        $max = ( $rating['rating_type'] == 'ten' ) ? 10 : 5;
        for( $n = 1; $n <= $max; $n++ ) {
            $results[ $n ] = ( isset( $temp[ $n ] ) ) ? $temp[ $n ] : 0;
        }

        return $results;
    }

    /**
    * Unserialize selective question answers and form into single array
    */
    function process_question_results( $question ) {

        $results = $temp = array();
        $answers = $this->get_element_answers( $question['id'] );
        if( $answers ) :
            foreach( $answers as $value ) {
                $key = sanitize_title( $value['answer'] );
                if( !isset( $results[ $key ] ) ) $results[ $key ] = array( 'title' => $value['answer'], 'count' => 0 );
                $results[ $key ]['count']++;
            }
        endif;

        return $results;
    }

    /**
    * Unserialize text question answers and form into single array
    */
    function process_text_question_results( $question ) {
        $results = array();
        $answers = $this->get_element_answers( $question['id'] );

        if( $answers ) {
            foreach( $answers as $value ) {
                $data = unserialize( $value['answer'] );
                if( is_array( $data ) ) {
                    foreach ( $data as $val ) {
                        $key = sanitize_title( $val );
                        if( !isset( $results[ $key ] ) ) $results[ $key ] = array( 'answer' => $val, 'count' => 0 );
                        $results[ $key ]['count']++;
                    }
                } elseif( !isset( $results[ sanitize_title( $data ) ] ) ) {
                    $results[ sanitize_title( $data ) ] = array( 'answer' => $value['answer'], 'count' => 0 );
                    $results[ sanitize_title( $data ) ]['count']++;
                }
            }

            // Obtain a list of columns
            foreach ($results as $key => $row) {
                $title[ $key ] = $row['answer'];
                $count[ $key ] = $row['count'];
            }
            // Sort the data with volume descending, edition ascending
            // Add $data as the last parameter, to sort by the common key
            array_multisort($count, SORT_DESC, $title, SORT_ASC, $results);
        }

        return $results;
    }

    /**
    * Unserialize grid answers and form into single array
    */
    function process_grid_results( $grid ) {

        $results = array();

        foreach ($grid as $value) {
            $ans = unserialize($value['answer']);

            // Sort unserialized answers
            foreach ( $ans as $key => $value ) {
                if( !isset( $results[ $key ] ) ) $results[ $key ] = array();

                // If more than one col is selected for row
                if( is_array( $value ) ) {
                    foreach ( $value as $value2 ) {
                        $value2 = sanitize_title( $value2 );
                        if( !isset( $results[ $key ][ $value2 ] ) ) $results[ $key ][ $value2 ] = 0;
                        $results[ $key ][ sanitize_title( $value2 ) ]++;
                    }
                } else {
                    if( !isset( $results[ $key ][ sanitize_title( $value ) ] ) ) $results[ $key ][ sanitize_title( $value ) ] = 0;
                    $results[ $key ][ sanitize_title( $value ) ]++;
                }
            }
        }

        return $results;
    }

    /**
    * Retrieve statistics for recently taken surveys: number of participants per survey
    */
    function get_takers_by_survey() {
        global $wpdb;

        $sel = $wpdb->get_results( "SELECT sid, COUNT(sid) as total_takers FROM " . $wpdb->prefix . "beSurveys_users GROUP BY sid ORDER BY date", ARRAY_A );
        $surveys = array();

        foreach ($sel as $value)
            $surveys[ $value['sid'] ] = $value['total_takers'];

        if( count( $surveys ) ) return $surveys;

        return false;
    }
    
    function array_column($input = null, $columnKey = null, $indexKey = null)
    {
        // Using func_get_args() in order to check for proper number of
        // parameters and trigger errors exactly as the built-in array_column()
        // does in PHP 5.5.
        $argc = func_num_args();
        $params = func_get_args();

        if ($argc < 2) {
            trigger_error("array_column() expects at least 2 parameters, {$argc} given", E_USER_WARNING);
            return null;
        }

        if (!is_array($params[0])) {
            trigger_error(
                'array_column() expects parameter 1 to be array, ' . gettype($params[0]) . ' given',
                E_USER_WARNING
            );
            return null;
        }

        if (!is_int($params[1])
            && !is_float($params[1])
            && !is_string($params[1])
            && $params[1] !== null
            && !(is_object($params[1]) && method_exists($params[1], '__toString'))
        ) {
            trigger_error('array_column(): The column key should be either a string or an integer', E_USER_WARNING);
            return false;
        }

        if (isset($params[2])
            && !is_int($params[2])
            && !is_float($params[2])
            && !is_string($params[2])
            && !(is_object($params[2]) && method_exists($params[2], '__toString'))
        ) {
            trigger_error('array_column(): The index key should be either a string or an integer', E_USER_WARNING);
            return false;
        }

        $paramsInput = $params[0];
        $paramsColumnKey = ($params[1] !== null) ? (string) $params[1] : null;

        $paramsIndexKey = null;
        if (isset($params[2])) {
            if (is_float($params[2]) || is_int($params[2])) {
                $paramsIndexKey = (int) $params[2];
            } else {
                $paramsIndexKey = (string) $params[2];
            }
        }

        $resultArray = array();

        foreach ($paramsInput as $row) {
            $key = $value = null;
            $keySet = $valueSet = false;

            if ($paramsIndexKey !== null && array_key_exists($paramsIndexKey, $row)) {
                $keySet = true;
                $key = (string) $row[$paramsIndexKey];
            }

            if ($paramsColumnKey === null) {
                $valueSet = true;
                $value = $row;
            } elseif (is_array($row) && array_key_exists($paramsColumnKey, $row)) {
                $valueSet = true;
                $value = $row[$paramsColumnKey];
            }

            if ($valueSet) {
                if ($keySet) {
                    $resultArray[$key] = $value;
                } else {
                    $resultArray[] = $value;
                }
            }

        }

        return $resultArray;
    }

}
?>