How to determine whether a string is valid JSON?

Question

Does anyone know of a robust (and bullet proof) is_JSON function snippet for PHP? I (obviously) have a situation where I need to know if a string is JSON or not.

Hmm

Answer 1

$this->post_data = json_decode( stripslashes( $post_data ) );
  if( $this->post_data === NULL )
   {
   die( '{"status":false,"msg":"The post_data parameter must be valid JSON"}' );
   }