Pretty print a matrix (bidimensional array)

print_matrix.php

<?php
 
/**
 * Pretty print a matrix (bidimensional array).
 *
 * @author Francisco Lopes <[email protected]>
 * @param array $matrix The matrix to print
 * @return void
 */
function print_matrix(array $matrix) {
    if (!count($matrix) || !count($matrix[0]))
        return;
     
    $width = max(array_map('strlen', call_user_func_array('array_merge', $matrix)));
    $column = str_repeat('─', $width);
     
    echo '┌' . str_repeat($column . '┬', count($matrix[0]) - 1) . $column . '┐' . PHP_EOL;
     
    for ($i = 0; $i < count($matrix); $i++) {
        echo '│';
        for ($j = 0; $j < count($matrix[$i]); $j++) {
            echo str_pad($matrix[$i][$j], $width, ' ', STR_PAD_LEFT) . '│';
        }
        echo PHP_EOL;
         
        if ($i < count($matrix) - 1)
            echo '├' . str_repeat($column . '┼', count($matrix[$i]) - 1) . $column . '┤' . PHP_EOL;
    }
     
    echo '└' . str_repeat($column . '┴', count($matrix[0]) - 1) . $column . '┘' . PHP_EOL;
}