title: PHP : Add word from array to string after every 5 words
body: <p>I've got a string and i wanted to put a word every after 5 words. The word is coming from array.</p>
  <pre><code>French History Maths Physics Spanish Chemistry Biology English DT Maths History DT Spanish English French RS
  </code></pre>
  <p>and i want to get 2 words from the array then insert it to the string above after 5 words.</p>
  <pre><code>$words = arrray(a, able, about, above, abst, accordance, according, accordingly, across, act, actually, added, adj);
  </code></pre>
  <p>Like this output :</p>
  <pre><code>French History Maths Physics Spanish a able about above abst Chemistry Biology English DT Maths according according accordingly across act Spanish English French RS.
  </code></pre>