PHP:格式化JSON为PHP语法格式

1. 原生函数

$arr = [1,2,3,4];
$str = var_export($a,true);
var_dump($str);

2. 自定义方法

class Export{private static $space;private static function do($a, string $prev){$res = '';$next = $prev . self::$space;if (is_array($a)) {$res .= '[';foreach ($a as $k => $v)  if (is_int($k)) {$res .= $next . self::do($v, $next) . ',';} else {$res .= $next . self::do($k, $next) . ' => ' . self::do($v, $next) . ',';}return $res . $prev . ']';} else if (is_scalar($a)) {return is_string($a) ? '\'' . str_replace('\'', '\\\'', $a) . '\'' : json_encode($a);} else return 'NULL';}public static function to($a, int $space_len = 2){self::$space = str_repeat(' ', max($space_len, 2));return self::do($a, PHP_EOL);}
}// $str = Export::to(转化的数据);
// var_dump($str);