How to short multidimensional PHP array (recent news time based implementation) : i got some recent news rss in xml format and change in to json format , it is needed for android application to display recent news. i have an following JSON array ...

    {
        "rss_news": [
            {
                "title": " ",
                "rss_original_src": "recent_news1(google news)",
                "rss_original_src_img": "",
                "link": "",
                "pubDate": "Tue, 19 Apr 2016 14:05:47 +0530",
                "description": ""
            },
     {
                "title": " ",
                "rss_original_src": "recent_news2(yahoo news)",
                "rss_original_src_img": "",
                "link": "",
                "pubDate": "Tue, 19 Apr 2016 16:05:47 +0530",
                "description": ""
            },
     {
                "title": " ",
                "rss_original_src": "recent_news3",
                "rss_original_src_img": "",
                "link": "",
                "pubDate": "Tue, 19 Apr 2016 11:05:47 +0530",
                "description": ""
            },
    ....
    ]
    }

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Now i need ... PHP multi dimensional array short based on value(pubDate)..

Thanks in advance..
       
