json_decode not works because i got json from external page in php [closed]

I'm trying to get JSON data from external website it's a valid JSON data but when decoding it from variable that came from php simple html dom i got an error "Syntax error", when i copied json data ant put it in variable as a string it works fine i need to fix this error .

$html = new simple_html_dom();
$html->load($data);

$post_details_json = $html->find('.ba' , 0)->attr['data-ft'];
$json = $post_details_json;
$post_details = json_decode($json);

print_r($post_details);

This's My Json Data

{"mf_story_key":"106494564155746456","top_level_post_id":"106494015564378658","tl_objid":"10649401587635466","content_owner_id_new":"1063906267567564","throwback_story_fbid":"10649401565765728","page_id":"1063906276575674","story_location":9,"ott":"AX-hwalMIkPJ9q-Q","page_insights":{"10639062456456456":{"page_id":"10639012398789456","page_id_type":"page","actor_id":"106398978945641","dm":{"isShare":0,"originalPostOwnerID":0},"psn":"EntStatusCreationStory","post_context":{"object_fbtype":266,"publish_time":7686867,"story_name":"EntStatusCreationStory","story_fbid":["10876868672328"]},"role":1,"sl":9,"targets":[{"actor_id":"106546456334","page_id":"1063906546334","post_id":"1064946554654328","role":1,"share_id":0}]}},"actrs":"1063446545634","tds_flgs":3,"ftmd_400706":"111114l","tn":"-R"}

source https://stackoverflow.com/questions/73493893/json-decode-not-works-because-i-got-json-from-external-page-in-php