[wp-trac] [WordPress Trac] #43891: Performance improvement for WP_Query

[WordPress Trac]

#43891: Performance improvement for WP_Query
-------------------------------------------------+-------------------------
 Reporter:  rnaby                                |       Owner:  (none)
     Type:  enhancement                          |      Status:  new
 Priority:  normal                               |   Milestone:  Awaiting
                                                 |  Review
Component:  Query                                |     Version:
 Severity:  normal                               |  Resolution:
 Keywords:  has-patch needs-testing reporter-    |     Focuses:
  feedback                                       |
-------------------------------------------------+-------------------------

Comment (by rnaby):

 Yes @johnbillion . I tried putting the `judge` functions one above another
 and the results are pretty similar. Please have a look at the screenshot.

 [[Image(https://raw.githubusercontent.com/rnaby/screenshots/master/Screenshot-2018-04-29-10%3A44%3A20-001.png)]]

 Here is the testing script-


 {{{
 <?php

 function _reset( $array ) {
         return reset($array);
 }

 function _foreach( $array ) {
         foreach( $array as $el ) {
             return $el;
         }
 }

 function judge($array, $method) {
     $loop = 10000;

     $time = microtime(true);

     for ($i = 0; $i < $loop; ++$i) {
         $temp = $method($array);
     }

     $time = microtime(true) - $time;

     echo implode(PHP_EOL, [
         $method.':',
         "  Time: {$time}s",
         "  Result: {$temp}",
         '',
         '',
     ]);
 }

 $a = [];

 $index = 0;

 for ($i = 0; $i < 10000; ++$i) {
     $index += rand(1, 5);

     $a[$index] = substr(md5(rand()), 0, rand(3, 7));
 }

 judge($a, '_foreach');
 judge($a, '_reset');
 }}}

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Ticket URL: <https://core.trac.wordpress.org/ticket/43891#comment:2>
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