title: How to sort array in descending order based on a specific value
body: <p>I have an array of news like</p>
  
  <pre><code>Array
  (
    [0] =&gt; Array
      (
          [news_published] =&gt; 1337192831
          [news_category] =&gt; 5
      )
  
    [1] =&gt; Array
      (
          [news_published] =&gt; 1334566743
          [news_category] =&gt; 5
      )
  
    [2] =&gt; Array
      (
          [news_published] =&gt; 1340092425
          [news_category] =&gt; 6
      )
  
    [3] =&gt; Array
      (
          [news_published] =&gt; 1339740173
          [news_category] =&gt; 6
      )
  
    [4] =&gt; Array
      (
          [news_published] =&gt; 1336148837
          [news_category] =&gt; 6
      )
  )
  </code></pre>
  
  <p>How I can sort news_published by descending order....I have tried with 'usort' but cant find the result properly can anyone suggest me?</p>