Auto Generator Model for database

<?php

class ModelGenerator {
    private $tableName;
    private $columns;

    public function __construct($tableName, $columns) {
        $this->tableName = $tableName;
        $this->columns = $columns;
    }

    private function convertToPascalCase($str) {
        return str_replace(' ', '', ucwords(str_replace('_', ' ', $str)));
    }

    private function convertToCamelCase($str) {
        $str = $this->convertToPascalCase($str);
        return lcfirst($str);
    }

    public function generateModel() {
        $modelName = $this->convertToPascalCase($this->tableName);

        $code = "<?php\n\n";
        $code .= "/**\n";
        $code .= " * This file was automatically generated by ModelGenerator.\n";
        $code .= " * Generated on: " . date('Y-m-d H:i:s') . "\n";
        $code .= " */\n\n";
        $code .= "class $modelName\n";
        $code .= "{\n";

        foreach ($this->columns as $columnName => $columnType) {
            $propertyName = $this->convertToCamelCase($columnName);
            $code .= "\tprivate $$propertyName;\n\n";
            $code .= "\tpublic function get" . ucfirst($propertyName) . "()\n";
            $code .= "\t{\n";
            $code .= "\t\treturn \$this->$propertyName;\n";
            $code .= "\t}\n\n";
            $code .= "\tpublic function set" . ucfirst($propertyName) . "(\$value)\n";
            $code .= "\t{\n";
            $code .= "\t\t\$this->$propertyName = \$value;\n";
            $code .= "\t}\n\n";
        }

        $code .= "}\n";

        return $code;
    }
}

// Read the JSON file path from command-line arguments
if (count($argv) < 2) {
    echo "Usage: php ModelGenerator.php <json_file_path>" . PHP_EOL;
    exit(1);
}

$jsonFilePath = $argv[1];

if (!file_exists($jsonFilePath)) {
    echo "Error: JSON file not found: $jsonFilePath" . PHP_EOL;
    exit(1);
}

// Read the JSON file
$jsonData = file_get_contents($jsonFilePath);
$tableData = json_decode($jsonData, true);

if ($tableData === null) {
    echo "Error: Invalid JSON format" . PHP_EOL;
    exit(1);
}

// Extract table name and columns from JSON data
$tableName = key($tableData);
$columns = $tableData[$tableName];

// Create an instance of ModelGenerator
$modelGenerator = new ModelGenerator($tableName, $columns);

// Generate the model code
$modelCode = $modelGenerator->generateModel();

// Get the directory of the JSON file
$jsonFileDir = dirname($jsonFilePath);

// Specify the output file path
$outputFilePath = $jsonFileDir . '/' . ucfirst($tableName) . '.php';

// Output the generated code to a file
if (file_put_contents($outputFilePath, $modelCode) === false) {
    echo "Error: Failed to write the output file: $outputFilePath" . PHP_EOL;
    exit(1);
}

echo "Model class generated successfully: $outputFilePath" . PHP_EOL;