3v4l.org

run code in 300+ PHP versions simultaneously

@ 2017-01-24T17:46:45Z

<?php

function interpreter(string $code, int $iterations, int $width, int $height): string {
    $dataGrid = [];
    $output = '';
    $codeOffset = -1;
    $skip = 0;
    $commands = $code;
    $pointer = ['x' => 0, 'y' => 0];
    $jmps = new SplStack();
    
    for ($row = 0; $row < $width; ++$row) {
        for ($col = 0; $col < $height; ++$col) {
            $dataGrid[$col][$row] = '0';
        }
    }

    while (strlen($commands) && $iterations) {
        //if (!$skip)
            //echo "{$commands} ({$pointer['x']}, {$pointer['y']} = {$dataGrid[$pointer['x']][$pointer['y']]})\n";
        ++$codeOffset;
        $command = $commands[0];
        $commands = substr($commands, 1);
        
        if ($skip) {
            if ($command === ']') {
                $jmps->pop();
                var_dump("pop");
                --$skip;
            } elseif ($command === '[') {
                ++$skip;
            }
            continue;
        }
        //var_dump($command);

        switch ($command) {
            case 'n':
                if (--$pointer['x'] === -1) {
                    $pointer['x'] = $height - 1;
                }
                break;
            case 'e':
                if (++$pointer['y'] === $width) {
                    $pointer['y'] = 0;
                }
                break;
            case 's':
                if (++$pointer['x'] === $height) {
                    $pointer['x'] = 0;
                }
                break;
            case 'w':
                if (--$pointer['y'] === -1) {
                    $pointer['y'] = $width - 1;
                }
                break;
            case '*':
                if ($dataGrid[$pointer['x']][$pointer['y']] === '0') {
                    echo "{$pointer['x']}, {$pointer['y']} = 1\n";
                    $dataGrid[$pointer['x']][$pointer['y']] = '1';
                } else {
                    echo "{$pointer['x']}, {$pointer['y']} = 0\n";
                    $dataGrid[$pointer['x']][$pointer['y']] = '0';
                }
                break;
            case '[':
                $jmps->push($codeOffset);
                var_dump("push");
                
                if ($dataGrid[$pointer['x']][$pointer['y']] === '0') {
                    $skip = 1;
                }
                break;
            case ']':
                $jmpOffset = $jmps->top();
                var_dump("pop");
                
                if ($dataGrid[$pointer['x']][$pointer['y']] === '1') {
                    $commands = substr($code, $jmpOffset + 1);
                    $codeOffset = $jmpOffset;
                    // ++$iterations;
                }
                break;
            default:
                continue 2;
        }
        
        --$iterations;
    }
    
    $rows = [];

    foreach ($dataGrid as $row) {
        $rows[] = implode('', $row);
    }
    
    return implode("\r\n", $rows);
}

var_dump(interpreter("*[es*]", 52, 5, 6));
/*
11000
01100
00110
00011
00001
10000*/
// var_dump(interpreter("*[s[e]*]", 9, 5, 5));
/*10000
10000
00000
00000
00000*/

Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6: 0, 0 = 1 string(4) "push" 1, 1 = 1 string(3) "pop" 2, 2 = 1 string(3) "pop" 3, 3 = 1 string(3) "pop" 4, 4 = 1 string(3) "pop" 5, 0 = 1 string(3) "pop" 0, 1 = 1 string(3) "pop" 1, 2 = 1 string(3) "pop" 2, 3 = 1 string(3) "pop" 3, 4 = 1 string(3) "pop" 4, 0 = 1 string(3) "pop" 5, 1 = 1 string(3) "pop" 0, 2 = 1 string(3) "pop" string(40) "11100 01100 00110 00011 10001 11000"
Output for 8.3.5: Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 0, 0 = 1 string(4) "push" 1, 1 = 1 string(3) "pop" 2, 2 = 1 string(3) "pop" 3, 3 = 1 string(3) "pop" 4, 4 = 1 string(3) "pop" 5, 0 = 1 string(3) "pop" 0, 1 = 1 string(3) "pop" 1, 2 = 1 string(3) "pop" 2, 3 = 1 string(3) "pop" 3, 4 = 1 string(3) "pop" 4, 0 = 1 string(3) "pop" 5, 1 = 1 string(3) "pop" 0, 2 = 1 string(3) "pop" string(40) "11100 01100 00110 00011 10001 11000"
Output for 5.6.0 - 5.6.40: Parse error: syntax error, unexpected ':', expecting '{' in /in/s5IdF on line 3
Process exited with code 255.

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