嵌套的php循环吞噬了GB的Linux薄荷内存 [英] nested php loop eats gigabytes of linux mint memory

问题描述

    I have some 7 nestings for/foreach php script which crashed my computer many times, and eaten each time 200-500 Mb memory, more than 3GB in total. 

    I can not recover the memory. 

我在代码中使用 opcache_reset();

也在命令行中尝试过

apt clean
apt autoremove --purge
apt-get autoremove 
apt-get autoclean
apt-get clean

php哪里出问题了?

Where is the problem with php?

opcache_reset();
$wayA = [ 
    'way1' => [
        'pr_w1' => [1, 6, 25, 50 ], 
        'revenue_w1' => 0, 
        'profit_w1' => 0, 
        'opex_w1' => [], 
        't_r_w1' => 0,
    ],

    'way2' => [
        'price_w2'=> [ 5, 10, 25, 50, 90 ],  
        'revenue_w2'=>0, 
        'profit_w2'=>0, 
        'opex_w2'=>0, 
        't_r_w2'=>0,
    ],          
];

for ( $w=1; $w<2; $w++ ) {

    for ( $e=1; $e<=21; $e+4 ) {
        $ansA[$e][$w]=[]; 
        $tw = $tz + $e * 100;
        $tz = $tw;

        for ( $t_rr=1; $t_rr<2; $t_rr++ ) {
            $t_r=5 + $t_rr*20; //tourists

            for ( $pr_rr=1; $pr_rr<2; $pr_rr++ ) {
                $pr_r= 5+ $pr_rr*15;  //price

                for ( $opex_rr=1; $opex_rr<2; $opex_rr++ ) { 
                    $opex_r= 9 + $opex_rr*20;  //opex

                    for( $N=1; $N<=2; $N++ ) { 

                        $pr_wX_key ='pr_w'.$N; //'price_w1' = 'pr_w1'
                        $wayX_key='way'.$N; 

                        foreach ( $wayA[$wayX_key][$pr_wX_key] as $pr ) {

$pr_wX = $pr / $pr_r; 
$opex_wX = $pr_wX * $opex_r/100; 
$t_NX = $tz * $t_r/100;
$rev_wX =  $t_NX * $pr_wX;//revenue = tourist numer * price
$prof_bt_wX =  $pr_wX - $opex_wX; //profit

$pr_wX_kX = 'pr_w'.$N; 
$opex_wX_kX = 'opex_w'.$N;
$t_r_wX_kX = 't_r_w'.$N;
$rev_wX_kX = 'rev_w'.$N;
$prof_bt_wX_kX = 'prof_bt_w'.$N;
$ansA[$w][$e][$t_NX_k]=[];      
$pr_wX_k= sprintf('%g',$pr_wX);   
$opex_wX_k= sprintf('%g',$opex_wX);                                      
$ansA[$w][$e][$t_NX_k][$pr_wX_k]=[];
$ansA[$w][$e][$t_NX_k][$pr_wX_k][$opex_wX_k]=[]; 
$ansA[$w][$e][$t_NX_k][$pr_wX_k][$opex_wX_k][$pr_wX_kX] =  $pr_wX; //'pr_w1'
$ansA[$w][$e][$t_NX_k][$pr_wX_k][$opex_wX_k][$opex_wX_kX] = $opex_wX; //'opex_w1'
$ansA[$w][$e][$t_NX_k][$pr_wX_k][$opex_wX_k][$t_r_wX_kX] = $t_NX; // 't_r_w1'
$ansA[$w][$e][$t_NX_k][$pr_wX_k][$opex_wX_k][$rev_wX_kX] = $rev_wX; // 'rev_w1'
$ansA[$w][$e][$t_NX_k][$pr_wX_k][$opex_wX_k][$prof_bt_wX_kX] = $prof_bt_wX; //'prof_bt_w1'

                        } // for ( way1['price_w1' as
                    } // for( $N=0; $N<4; $N++ ) 
                } // for ( t_r_w1=5; t_r_w1<100; t_r_w
            } // for ( opex_w1_r=9; opex_w
        } // for ( price_w1=1; price_w
    } // for ( $w=1; $w<250; $w++
} // for ( $e=1; $e<10

我已经将3GB的/home文件剪切/粘贴到其他磁盘上，但是每次我运行scrip时，我都会在/home中获得0字节的可用内存.为什么?

I have cut/pasted some 3GB of /home files to other disk, but each time i run scrip i finish with 0 bytes of free memory in /home. Why ?

推荐答案

您不能在 for 循环中执行 $ e + 4 -变量永远不会递增，并且会不断地奔跑.

You cannot do $e+4 in your for loop -- the variable never increments and will run endlessly.

取而代之的是 $ e + = 4 .

此外，您可能需要考虑重构代码，以使代码更具可读性，更重要的是，可以维护.您可能不记得从现在开始的6个月后会执行什么操作.

Also, you may want to consider refactoring your code so it is more readable and, more importantly, maintainable. You probably won't remember what this does 6 months from now.

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