Transpose Matrix in Php

Welcome to the Transpose Matrix in Php page! Here, you'll find the source code for this program as well as a description of how the program works.

Current Solution

<?php
function usage()
{
    exit("Usage: please enter the dimension of the matrix and the serialized matrix");
}

function parse_int($str_value)
{
    // Remove leading and trailing spaces
    $str_value = trim($str_value);

    // Make sure all digits
    if (preg_match("/^\d+$/", $str_value) === FALSE)
    {
        return FALSE;
    }

    // Make sure valid integer
    if (
        filter_var(
            $str_value,
            FILTER_VALIDATE_INT,
            array(
                'options' => array(
                    'decimal' => TRUE,
                    'min_range' => PHP_INT_MIN,
                    'max_range' => PHP_INT_MAX
                )
            )
        ) === FALSE
    )
    {
        return FALSE;
    }

    return intval($str_value);
}

function parse_int_array($str_values)
{
    $str_array = explode(",", $str_values);
    $values = array();
    foreach ($str_array as $str_value)
    {
        $value = parse_int($str_value);
        if ($value === FALSE)
        {
            return FALSE;
        }

        array_push($values, $value);
    }

    return $values;
}

// Convert list to matrix
function convert_list_to_matrix($values, $num_cols)
{
    return array_chunk($values, $num_cols);
}

// Transpose matrix
function transpose_matrix($matrix)
{
    // Get number of rows.
    // If 1, use 'array_chunk' to output each value in the row to its own row.
    // Otherwise, use 'array_map' with no function and the "splat" operator to
    // output one value in each column and append it to each row
    return (count($matrix) == 1) ? array_chunk($matrix[0], 1) : array_map(NULL, ...$matrix);
}

// Show matrix as a list
function show_matrix_as_list($matrix)
{
    // Join each row value with a comma for each column value
    printf(
        "%s\n",
        implode(", ", array_map(
            function ($value) { return implode(", ", $value); },
            $matrix)
        )
    );
}

// Exit if too few arguments
if (count($argv) < 4)
{
    usage();
}

// Parse 1st argument. Exit if invalid or less than 1
$num_cols = parse_int($argv[1]);
if ($num_cols === FALSE || $num_cols < 1)
{
    usage();
}

// Parse 2nd argument. Exit if invalid or less than 1
$num_rows = parse_int($argv[2]);
if ($num_rows === FALSE || $num_rows < 1)
{
    usage();
}

// Parse 3nd argument. Exit if invalid if incorrect size
$values = parse_int_array($argv[3]);
if ($values == FALSE || count($values) != $num_rows * $num_cols)
{
    usage();
}

// Convert list to matrix
$matrix = convert_list_to_matrix($values, $num_cols);

// Transpose matrix
$matrix_t = transpose_matrix($matrix);

// Show matrix as a list
show_matrix_as_list($matrix_t);

Transpose Matrix in Php was written by:

• rzuckerm

If you see anything you'd like to change or update, please consider contributing.

How to Implement the Solution

No 'How to Implement the Solution' section available. Please consider contributing.

How to Run the Solution

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