title: Split a string into exactly two strings in php
body: <p>I need to split a string into exactly two parts.</p>
  
  <p>Example:</p>
  
  <pre><code>$str = 'abc def ghi jkl'
  </code></pre>
  
  <p>Result:</p>
  
  <pre><code>$arr[0] = 'abc'
  $arr[1] = 'def ghi jkl'
  </code></pre>
  
  <p>I tried </p>
  
  <pre><code>explode(' ', $str);
  </code></pre>
  
  <p>but it is giving me all the parts of the string. 
  How do you combine the rest of the array would be a better question i guess?</p>
  
  <p>Thanks for your help~</p>