README.md

Usage:

php script.php test.plt

Sample output:

G01 X-7626 Y-392 Z0
G01 X-7642 Y-436 Z0
G01 X-7652 Y-481 Z0
G01 X-7655 Y-526 Z0
G01 X-7652 Y-570 Z0
G01 X-7642 Y-615 Z0
G01 X-7626 Y-659 Z0
G01 X-7604 Y-704 Z0
G01 X-7635 Y-704 Z0
G01 Z1000

script.php

<?php
/**
 * Invoke the script with a filename to parse:
 * 
 *     php script.php test.plt
 */

if (!isset($argv[1])) {
    echo 'Please provide a file name an argument, for example:' . PHP_EOL;
    echo 'php script.php test.plt' . PHP_EOL;
    exit(1);
}

$filename = $argv[1];

if (!file_exists($filename)) {
    echo "The file $filename does not exist" . PHP_EOL;
    exit(1);
}

// Read the file
$fileContent = file_get_contents($filename);

// Split on the ';' separator
$instructions = explode(';', $fileContent);

foreach ($instructions as $instruction) {
    if (empty($instruction) || ($instruction == 'IN')) {
        // Ignore empty lines and IN
        continue;
    }

    // 2 first characters
    $penAction = substr($instruction, 0, 2);
    if ($penAction == 'PU') {
        // Pen UP
        $penAction = 'Z1000';
    } else {
        // Pen DOWN
        $penAction = 'Z0';
    }

    $coordinates = substr($instruction, 2);
    if (empty($coordinates)) {
        // No coordinates?
        echo 'G01 ' . $penAction . PHP_EOL;
        continue;
    }
    $coordinates = explode(',', $coordinates);

    $x = $coordinates[0];
    $y = $coordinates[1];

    echo 'G01 X-' . $x . ' Y-' . $y . ' ' . $penAction . PHP_EOL;
}