My solution to the task "Print an associative array as an ASCII table". More info can be found on task author page: http://phpixie.com/blog/test-tasks-for-php-interviews-that-developers-will-enjoy-solving/

Print an associative array as an ASCII table

<?php

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

$table = array(
    array(
        'Name'    => 'Trixie',
        'Color'   => 'Green',
        'Element' => 'Earth',
        'Likes'   => 'Flowers'
    ),
    array(
        'Name'    => 'Tinkerbell',
        'Element' => 'Air',
        'Likes'   => 'Singing',
        'Color'   => 'Blue'
    ),
    array(
        'Element' => 'Water',
        'Likes'   => 'Dancing',
        'Name'    => 'Blum',
        'Color'   => 'Pink'
    ),
);

function draw_table($table)
{

    $nl              = "\n";
    $columns_headers = columns_headers($table);
    $columns_lengths = columns_lengths($table, $columns_headers);
    $row_separator   = row_seperator($columns_lengths);
    $row_spacer      = row_spacer($columns_lengths);
    $row_headers     = row_headers($columns_headers, $columns_lengths);

    echo '<pre>';

    echo $row_separator . $nl;
    echo str_repeat($row_spacer . $nl, SPACING_Y);
    echo $row_headers . $nl;
    echo str_repeat($row_spacer . $nl, SPACING_Y);
    echo $row_separator . $nl;
    echo str_repeat($row_spacer . $nl, SPACING_Y);
    foreach ($table as $row_cells) {
        $row_cells = row_cells($row_cells, $columns_headers, $columns_lengths);
        echo $row_cells . $nl;
        echo str_repeat($row_spacer . $nl, SPACING_Y);
    }
    echo $row_separator . $nl;

    echo '</pre>';

}

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

function columns_lengths($table, $columns_headers)
{
    $lengths = [];
    foreach ($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;
}

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

    return $row;
}

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

    return $row;
}

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

    return $row;
}

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

    return $row;
}

draw_table($table);

/*
 * Example output:
 * +------------+-------+---------+---------+
 * |    Name    | Color | Element |  Likes  |
 * +------------+-------+---------+---------+
 * | Trixie     | Green | Earth   | Flowers |
 * | Tinkerbell | Blue  | Air     | Singing |
 * | Blum       | Pink  | Water   | Dancing |
 * +------------+-------+---------+---------+
 */

Thanks, I just forked it and modify it a bit into a class for a little project of mine. I'm using for logging sql results to a log file.
Here's my fork: https://gist.github.com/josecanciani/ff535426bd5d453ef9c2