<?php
$content = file_get_contents('index.php');
$lines = explode("\n", $content);
$stack = [];
$in_php = false;

foreach ($lines as $idx => $line) {
    $line_num = $idx + 1;
    
    // Simple check for PHP tags
    if (strpos($line, '<?php') !== false) $in_php = true;
    if (strpos($line, '?>') !== false) $in_php = false;

    // Alternative syntax checks
    if (preg_match('/\bif\b\s*\(.*\)\s*:/', $line)) {
        $stack[] = ['type' => 'if', 'line' => $line_num];
    } elseif (preg_match('/\belseif\b\s*\(.*\)\s*:/', $line)) {
        // elseif is part of the current if block, so it doesn't change nesting level
    } elseif (preg_match('/\belse\b\s*:/', $line)) {
        // else is part of the current if block, so it doesn't change nesting level
    } elseif (preg_match('/foreach\s*\(.*\)\s*:/', $line)) {
        $stack[] = ['type' => 'foreach', 'line' => $line_num];
    }
    if (strpos($line, 'endif;') !== false) {
        if (empty($stack)) {
            echo "Unexpected endif; at line $line_num\n";
        } else {
            $last = array_pop($stack);
            if ($last['type'] !== 'if') {
                echo "Mismatched endif; at line $line_num (expected endforeach; for {$last['type']} at line {$last['line']})\n";
            }
        }
    }
    if (strpos($line, 'endforeach;') !== false) {
        if (empty($stack)) {
            echo "Unexpected endforeach; at line $line_num\n";
        } else {
            $last = array_pop($stack);
            if ($last['type'] !== 'foreach') {
                echo "Mismatched endforeach; at line $line_num (expected endif; for {$last['type']} at line {$last['line']})\n";
            }
        }
    }
}

foreach ($stack as $unclosed) {
    echo "Unclosed {$unclosed['type']} starting at line {$unclosed['line']}\n";
}