How can i parse php functions from JSON string variable?

I want to extract and run PHP functions from a JSON string variable. my string variable is something like this :

$str = '"field_table_id": {
    "element_name": "select",
    "title": "some_title",
    "attributes": {
        "id": "field_table_id"
    },
    "options": {
        "values" : "@php_function ['function1', 'arg1', 'arg2', 'arg3'] @end_php",
        "titles" : "@php_function ['function1', 'arg1', 'arg2', 'arg3'] @end_php"
    }
}';

how can I do this?

When I ask this question I think the following answer is right but I found a better solution now.
I write a simple function for this. you can use this function in your codes.

function php_function_parser( $string ) {
    $valid_functions = array( 'function1', 'function2' );
    $string = preg_replace_callback(
        '/@php_function(.*?)@end_php/m',
        function ($matches) {
            $usr_function = $matches[1];
            eval("\$usr_function = $usr_function;");
            if ( is_array($usr_function) ) {
                if ( in_array($usr_function[0], $valid_functions) ) {
                    $fnc_name = $usr_function[0];
                    array_shift($usr_function);
                    if ( is_array($usr_function) ) {
                        return call_user_func_array( $fnc_name, $usr_function );
                    } else {
                        return call_user_func( $fnc_name, $usr_function );
                    }
                } else {
                    return 'invalid or forbidden php function use';
                }
            }
        },
        $string
    );
    return $string;
}

$str = "<h4>@php_function ['function1', 'arg1', 'arg2', 'arg3'] @end_php</h4>";
echo php_function_parser($str);

My new solution is :
In JSON syntax curly braces hold objects and square brackets hold arrays suppose I change the JSON to the following string :

{
    "field_table_id": {
        "element_name": "select",
        "title": "programming lanquages",
        "attributes": "json_object('element_attrs')",
        "options": {
            "values" : "json_array('options_values')"
        }
    }
}

I want replace

json_object('element_attrs')

with a PHP array like this as JSON object:

array('id' => 'select1', 'value' => 'php', 'style' => 'width:30%')

and

json_array('options_values')

with this PHP array as JSON array:

array('php', 'html', 'js', 'jquery')

the following PHP function to this for us

function readOurJson( string $json_path, array $replaces = array() ) {
    if ( is_file($json_path) ) {
        $json_string = file_get_contents( $json_path );
    } else {
        return false;
    }
    $json_string = preg_replace_callback(
        '/\"(json_array|json_object)\(\'([a-zA-Z]+[0-9a-zA-Z_]*)\'\)\"/m',
        function ($matches) use ($replaces) {
            if ( ! empty($matches) ) {
                $key = $matches[2];
                switch ( $matches[1] ) {
                    case 'json_array' :
                        if ( isset($replaces[$key]) ) {
                            if ( is_array($replaces[$key]) ) {
                                $json_array = '"' . implode( '","', $replaces[$key] ) . '"';
                                return "[$json_array]";
                            }
                        }
                    case 'json_object' :
                        if ( isset($replaces[$key]) ) {
                            if ( is_array($replaces[$key]) ) {
                                $json_object = json_encode($replaces[$key]);
                                return $json_object;
                            }
                        }
                }
                return $matches[0];
            }
        },
        $json_string
    );
    return json_decode($json_string);
}

usage:

$replaces = array(
    'element_attrs' => array('id' => 'select1', 'value' => 1, 'style' => 'width:30%'),
    'options_values' => array('php', 'html', 'js', 'jquery')
);
$array = readOurJson( $json_path, $replaces);
var_dump($array);

Test Code on PHP Sandbox
Let me know if you have any suggestions or corrections.