#51122 [Opn]: the iteration on arrays with calling functions is very slow

[y_kopel at walla dot com]

 ID:               51122
 User updated by:  y_kopel at walla dot com
 Reported By:      y_kopel at walla dot com
 Status:           Open
 Bug Type:         Arrays related
 Operating System: linux
 PHP Version:      5.3.1
 New Comment:

shorter code:
<?php

for ($i = 0 ;$i < 1000000 ; $i++){
        $users[$i]['SUM'] = 2;
}
$start = microtime(true);
$sum = 0;
foreach ($users as &$u){
        if ($u['SUM'] > 1){     $sum++;}
}
echo microtime(true) - $start."\n";
?>

OUTPUT
======

php 5.2.1
=========
0.328261852264

php 5.3.1
=========
42.350708961487


Previous Comments:
------------------------------------------------------------------------

[2010-02-23 11:40:36] y_kopel at walla dot com

Description:
------------
the iteration on arrays with calling functions is very slow
comparing php 5.2.1 to 5.3.1

Reproduce code:
---------------
<?php
define("FLOATING_POINT",6);

function ww($f){
        echo sprintf("%.".FLOATING_POINT."f", $f)."\n";
}

class A{
        protected $users;
        function __construct(){
                for ($i = 0 ;$i < 100000 ; $i++){
                        $this->users[$i]['ELEMENT'] = array("a","b");
                        $this->users[$i]['SUM'] = 2;
                }
        }

        function check_more_than_one_element(){
                $sum = 0;
                foreach ($this->users as &$u){
                        if (count($u['ELEMENT']) > 1){
                                $sum++;
                        }
                }
                return $sum;
        }
        
        function a_check_more_than_one_element(){
                $sum = 0;
                foreach ($this->users as &$u){
                        if ($u['SUM'] > 1){
                                $sum++;
                        }
                }
                return $sum;
        }
}



$a = new A();
$start = microtime(true);
echo "-----\n";
for ($i = 0 ;$i < 5 ; $i++){
        $a->check_more_than_one_element();
        $a->check_more_than_one_element();
        $a->check_more_than_one_element();
        $a->check_more_than_one_element();
}
echo "-----\n";
echo microtime(true) - $start."\n";
$a = new A();
$start = microtime(true);
echo "-----\n";
for ($i = 0 ;$i < 5 ; $i++){
        $a->a_check_more_than_one_element();
        $a->a_check_more_than_one_element();
        $a->a_check_more_than_one_element();
        $a->a_check_more_than_one_element();
}

echo "-----\n";
echo microtime(true) - $start."\n";
?>

Expected result:
----------------
php 5.2.1
=========

-----
-----
1.75261092186
-----
-----
1.05390191078


Actual result:
--------------
php 5.3.1
=========

-----
-----
58.992564916611
-----
-----
30.829360961914



------------------------------------------------------------------------


-- 
Edit this bug report at http://bugs.php.net/?id=51122&edit=1