title: how to explode the index of an array in PHP?
body: <p>I have an array like</p>
  
  <pre><code>Array
  (
      [select_value_2_1] =&gt;  7
  )
  </code></pre>
  
  <p>I want to explode index into <code>Array ([0]=select_value, [1]=2, [2]=1)</code></p>