php - 如何在运行较长的 PHP 脚本时清除内存？试过 unset()

Question

我的脚本将 excel 文件导入产品数据库以更新新产品的数量等....

我有内存问题，我已尝试将内存限制提高到最大值 (800MB+)。我已经尝试取消设置变量以释放循环之间的内存，但我仍然用完了内存。我试过将超时设置为无限，但这绝对是内存问题。

来自日志文件的错误信息: fatal error :允许的 851443712 字节内存已耗尽(已尝试分配 71 字节)

没有任何脚本包含在函数中。如果我在函数内创建主 for 循环并重复调用该函数，是否有助于垃圾收集和清理内存？任何帮助或指导将不胜感激。

导入脚本:

error_reporting( E_ALL & ~E_NOTICE );
ini_set('memory_limit', '812M');
set_time_limit(0);

/* Config Start */
define('BasePath', '/home/xxxxx/public_html');
define('CfgMagentoPath',                    BasePath);
define('CfgCategoryMapDBxls',                   BasePath."/xxxx/Shdddddd.xls");
define('CfgVenderDBxls',                    BasePath."/xxxx/xxxxxx.xls");
define('CfgReportEmail',                    "xxxxxx@gmail.com");
/* Config End */

require_once(CfgMagentoPath . '/app/Mage.php');
Mage::app(); 
//$app = Mage::app('default'); 
//Mage::app()->setCurrentStore(Mage_Core_Model_App::ADMIN_STORE_ID);
require_once(BasePath.'/xxxxx/xxxx/libs/mage.func-inc.php');
require_once(BasePath.'/xxxxx/xxxxx/libs/excel-read.class.php');

//Alert Arrays
$AAnotmapped        = array();
$AAnewproducts  = array();
$AApriceupdated = array();
$AAimgerror         = array();
$PriceErrors        = array();

$SkipCat = false;

//Create Mapped Cats - In Magento

$excel = new ExcelReader(CfgCategoryMapDBxls,"UTF-8");
$CM = $excel->getWorksheetData('Sheet1');
if(!$SkipCat){
    echo "========   Generating Catagory Maps   ===========\n\n";
    CatMap_Create($CM);
    echo "======== ============================== ===========\n\n";
}

//Start Item Read
$excel = new ExcelReader(CfgVenderDBxls,"UTF-8");
$IT = $excel->getWorksheetData('New_DATA');
$ITcnt = 0;
$ITtotal = count($IT);

foreach($IT as $ItemRow){
    $ITcnt++;

    $cSKU                   = $ItemRow['ITEM'];
    $cProductName   = Clean_Data($ItemRow['ALTSHORTDESC']);
    $cCatName           = Clean_Data($ItemRow['CATEGORY']);
    $cManuf                 = Clean_Data($ItemRow['MANUFACTURER']);
    $cShortDesc         = Clean_Data($ItemRow['SHORTDESC']);
    $cLongDesc          = Clean_Data($ItemRow['LONGDESC']);
    $cUPC                       = Prod_GetUPC($ItemRow['UPC'], $ItemRow['ALTUPC']);
    $cStockQty          = $ItemRow['QTY'];
    $cWeight                = Prod_GetWeight($ItemRow['WEIGHT'], $ItemRow['ALTWEIGHT']);
    $cPrice                 = Prod_FigurePrice($ItemRow['COST'], $ItemRow['MSRP'], $ItemRow['MAP']);
    $cCost                  = $ItemRow['COST'];


    //Locate Catagory Map Magento ID
    $mCatId = CatMap_Search($CM, $ItemRow['CATEGORY']);

    //Now Create Product
    if($mCatId > 0 && $cProductName != ""){

        echo date("m.d.y g:i a")."\t($ITcnt / $ITtotal) Working On: " . $cProductName . " - SKU: $cSKU\n";
        $ProdID = Prod_GetIDfromSKU($cSKU);


        if($ProdID > 0){
            if(Prod_Update($ProdID, $cCost, $cStockQty, $cWeight, $cUPC)){
                echo "Updated: $cProductName\n";
                $ITindex++;
            }
        }else{
            Prod_Create($cSKU, $cProductName, $cManuf, $cPrice, $cCost, $cWeight, $cShortDesc, $cLongDesc, $cStockQty, $cUPC, $mCatId);
            echo "Created: $cProductName to Catagory: $mCatId\n";
            echo "$cShortDesc\n\n";
            $ProdID = Prod_GetIDfromSKU($cSKU);
        }


        if($cPrice <= $cCost){
            array_push($PriceErrors, "[$cSKU] $cProductName > Cost: $cCost | Price: $cPrice");  
            echo "Price Lower than Cost : Auto Inactive : Cost: $cCost | Price: $cPrice\n";
        }   

        Prod_AddImg($ProdID, $cSKU);

    }


    unset($ItemRow, $ProdID, $cSKU, $cProductName, $cManuf, $cPrice, $cCost, $cWeight, $cShortDesc, $cLongDesc, $cStockQty, $cUPC, $mCatId);
    echo "\n";  

}


echo "======== Disabling 0 Product Catagories ===========\n\n";
Cat_Disable_Empty($CM);
echo "======== ============================== ===========\n\n";

unset($CM, $IT, $excel);

//array_push($AAnotmapped, 'Cat not Mapped');
//array_push($AApriceupdated, '### Price Updated');
//array_push($AAimgerror , 'Image Error');

Send_Status_Email();

Mage_Reindex();


echo date("m.d.y g:i a")."\tCompleted\n\n";

//print_r($AAnotmapped);

//print_r($AApriceupdated);

//print_r($AAimgerror);

Answer 1

使用函数。
使用 $var = null; 而不是 unset($var);。取消设置只是杀死变量引用。

如上所述 comment :

When you are using unset, the memory will only be freed whenever garbage collector decides, but when you are setting a variable to a different value (null in this case), then you might get some memory freed of course with the cost of CPU.