title: Which statement is memory/processor efficient ?
body: <p>I don't have better why to rephrase the question , you might suggest me one. Most of the time I re-use a variable in php I wonder, which one will be memory/processor efficient . e.g </p>
  
  <p><strong>case A</strong></p>
  
  <pre><code> $string_var ='1,2,4,5,6,7,8';
   $array_var  =explode(',',$string_var);
  </code></pre>
  
  <p><strong>Case B</strong>: re-use the same variable (string variable and re-declare as array object) </p>
  
  <pre><code> $array_var ='1,2,4,5,6,7,8';
   $array_var  =explode(',',$array_var);
  </code></pre>
  
  <p>My question is not from code-readability point of view . I wonder which one will be efficient way in term of memory and processor utilization.</p>