Print an associative array as an ASCII table

<?php

/**
*
* Last version: https://gist.github.com/josecanciani/ff535426bd5d453ef9c2
*
* Credits (adapted from): https://gist.github.com/doubleking/6117215
*
**/

namespace structure\util;

use \STR_PAD_BOTH;

class ArrayToAsciiTable {

    const SPACING_X = 1;
    const SPACING_Y = 0;
    const JOINT_CHAR = '+';
    const LINE_X_CHAR = '-';
    const LINE_Y_CHAR = '|';

    function draw_table($table){
        if (!$table) {
            $table = array(array('' => 'No data found'));
        }
        $nl = "\n";
        $columns_headers = $this->columns_headers($table);
        $columns_lengths = $this->columns_lengths($table, $columns_headers);
        $row_separator = $this->row_seperator($columns_lengths);
        $row_spacer = $this->row_spacer($columns_lengths);
        $row_headers = $this->row_headers($columns_headers, $columns_lengths);

        $ascii = $row_separator . $nl;
        $ascii .= str_repeat($row_spacer . $nl, self::SPACING_Y);
        $ascii .= $row_headers . $nl;
        $ascii .= str_repeat($row_spacer . $nl, self::SPACING_Y);
        $ascii .= $row_separator . $nl;
        $ascii .= str_repeat($row_spacer . $nl, self::SPACING_Y);
        foreach($table as $row_cells)
        {
            $row_cells = $this->row_cells($row_cells, $columns_headers, $columns_lengths);
            $ascii .= $row_cells . $nl;
            $ascii .= str_repeat($row_spacer . $nl, self::SPACING_Y);
        }
        $ascii .= $row_separator;
        return $ascii;
    }

    private function columns_headers($table){
        return array_keys(reset($table));
    }

    private function columns_lengths($table, $columns_headers){
        $lengths = array();
        foreach($columns_headers as $header)
        {
            $header_length = strlen($header);
            $max = $header_length;
            foreach($table as $row)
            {
                $length = strlen($row[$header]);
                if($length > $max)
                    $max = $length;
            }

            if(($max % 2) != ($header_length % 2))
                $max += 1;

            $lengths[$header] = $max;
        }

        return $lengths;
    }

    private function row_seperator($columns_lengths){
        $row = '';
        foreach($columns_lengths as $column_length)
        {
            $row .= self::JOINT_CHAR . str_repeat(self::LINE_X_CHAR, (self::SPACING_X * 2) + $column_length);
        }
        $row .= self::JOINT_CHAR;

        return $row;
    }

    private function row_spacer($columns_lengths){
        $row = '';
        foreach($columns_lengths as $column_length)
        {
            $row .= self::LINE_Y_CHAR . str_repeat(' ', (self::SPACING_X * 2) + $column_length);
        }
        $row .= self::LINE_Y_CHAR;

        return $row;
    }

    private function row_headers($columns_headers, $columns_lengths){
        $row = '';
        foreach($columns_headers as $header)
        {
            $row .= self::LINE_Y_CHAR . str_pad($header, (self::SPACING_X * 2) + $columns_lengths[$header], ' ', STR_PAD_BOTH);
        }
        $row .= self::LINE_Y_CHAR;

        return $row;
    }

    private function row_cells($row_cells, $columns_headers, $columns_lengths){
        $row = '';
        foreach($columns_headers as $header)
        {
            $row .= self::LINE_Y_CHAR . str_repeat(' ', self::SPACING_X) . str_pad($row_cells[$header], self::SPACING_X + $columns_lengths[$header], ' ', STR_PAD_RIGHT);
        }
        $row .= self::LINE_Y_CHAR;

        return $row;
    }

}