谈谈关于PHP内存溢出的思考

<?php

namespace apiservice;

class ExportService
{

 public static $outPutFile = '';

 /**
 * 导出文件
 * @param string $fileName
 * @param $data
 * @param array $formFields
 * @return mixed
 */
 public static function exportData($fileName = '', $data, $formFields = [])
 {
 $fileArr = [];
 $tmpPath = Yii::$app->params['excelSavePath'];

 foreach (array_chunk($data, 10000) as $key => $value) {
 self::$outPutFile = '';
 $subject = !empty($fileName) ? $fileName : 'data_';
 $subject .= date('YmdHis');
 if (empty($value) || empty($formFields)) {
 continue;
 }

 self::$outPutFile = $tmpPath . $subject . $key . '.csv';
 if (!file_exists(self::$outPutFile)) {
 touch(self::$outPutFile);
 }
 $index = array_keys($formFields);
 $header = array_values($formFields);
 self::outPut($header);

 foreach ($value as $k => $v) {
 $tmpData = [];
 foreach ($index as $item) {
 $tmpData[] = isset($v[$item]) ? $v[$item] : '';
 }
 self::outPut($tmpData);
 }
 $fileArr[] = self::$outPutFile;
 }
 
 $zipFile = $tmpPath . $fileName . date('YmdHi') . '.zip';
 $zipRes = self::zipFile($fileArr, $zipFile);
 return $zipRes;
 }

 /**
 * 向文件写入数据
 * @param array $data
 */
 public static function outPut($data = [])
 {
 if (is_array($data) && !empty($data)) {
 $data = implode(',', $data);
 file_put_contents(self::$outPutFile, iconv("UTF-8", "GB2312//IGNORE", $data) . PHP_EOL, FILE_APPEND);
 }
 }

 /**
 * 压缩文件
 * @param $sourceFile
 * @param $distFile
 * @return mixed
 */
 public static function zipFile($sourceFile, $distFile)
 {
 $zip = new ipArchive();
 if ($zip->open($distFile, ipArchive::CREATE) !== true) {
 return $sourceFile;
 }

 $zip->open($distFile, ipArchive::CREATE);
 foreach ($sourceFile as $file) {
 $fileContent = file_get_contents($file);
 $file = iconv('utf-8', 'GBK', basename($file));
 $zip->addFromString($file, $fileContent);
 }
 $zip->close();
 return $distFile;
 }
 
 /**
 * 下载文件
 * @param $filePath
 * @param $fileName
 */
 public static function download($filePath, $fileName)
 {
 if (!file_exists($filePath . $fileName)) {
 header('HTTP/1.1 404 NOT FOUND');
 } else {
 //以只读和二进制模式打开文件
 $file = fopen($filePath . $fileName, "rb");

 //告诉浏览器这是一个文件流格式的文件
 Header("Content-type: application/octet-stream");
 //请求范围的度量单位
 Header("Accept-Ranges: bytes");
 //Content-Length是指定包含于请求或响应中数据的字节长度
 Header("Accept-Length: " . filesize($filePath . $fileName));
 //用来告诉浏览器，文件是可以当做附件被下载，下载后的文件名称为$file_name该变量的值
 Header("Content-Disposition: attachment; filename=" . $fileName);

 //读取文件内容并直接输出到浏览器
 echo fread($file, filesize($filePath . $fileName));
 fclose($file);
 exit();
 }
 }
}

$fileName = "库存导入模板";
$stockRes = []; // 导出的数据
$formFields = [
 'store_id' => '门店ID',
 'storeName' => '门店名称',
 'sku' => 'SKU编码',
 'name' => 'SKU名称',
 'stock' => '库存',
 'reason' => '原因'
];
$fileRes = ExportService::exportData($fileName, $stockRes, $formFields);
$tmpPath = Yii::$app->params['excelSavePath']; // 文件路径
$fileName = str_replace($tmpPath, '', $fileRes);

// 下载文件
ExportService::download($tmpPath, $fileName);