title: Concatenate two columns into one using array_column
body: <p>I have an array of type </p>
  
  <pre><code>$records = array(
  array(
      'id' =&gt; 2135,
      'first_name' =&gt; 'John',
      'last_name' =&gt; 'Cena',
  ),
  array(
      'id' =&gt; 5623,
      'first_name' =&gt; 'Peter',
      'last_name' =&gt; 'Doe',
  ));
  </code></pre>
  
  <p>I want to display the output in the format of </p>
  
  <pre><code>[2135] =&gt; John Cena
  [5623] =&gt; Peter Doe
  </code></pre>
  
  <p>I have been using following code to try to display my expected result but its not working.</p>
  
  <pre><code>$names = array_column($records, 'first_name' . 'last_name', 'id');
  </code></pre>
  
  <p>How can I concatenate two columns of array into one?</p>