PHP code optimization

This article mainly introduces the code optimization of PHP, which has certain reference value. Now I share it with everyone. Friends in need can refer to it

• Locating slow code locations

• ##Use xdebug

• Write your own code to calculate the execution time and gradually locate the slow code location. Example:

  <?php  
  //程序运行时间
  $starttime = explode(&#39; &#39;,microtime());
  echo microtime();
  /*········以下是代码区·········*/
  for($i=0;$i<1000000;$i++){
  $i;
  }
  /*········以上是代码区·········*/
  //程序运行时间
  $endtime = explode(&#39; &#39;,microtime());
  $thistime = $endtime[0]+$endtime[1]-($starttime[0]+$starttime[1]);
  $thistime = round($thistime,3);
  echo "本网页执行耗时：".$thistime." 秒。".time();
  ?>

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• Check the slow code

• The query speed is slow

• Whether to add an index, if no index is used Add index;

• There is an index but the query is slow. Check whether the index is used in the query. If the index is not used, optimize the sql statement

• Code operation Logical problem-> Modify the code

• Database query problem

• Other problems, if caching is possible, add cache, if asynchronous can be added, add asynchronous

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