原理： 就是原理很分页原理一样! 选取一定数量的数据然后变成数组，接着直接写入文件。接下来继续选取后面没选定数据在变成数组，接着在写入文件！这个解决了内存溢出。但是多CPU还是有个考验！ 由于本人刚刚学PHP（PHP培训 php教程 ）不久，功力不深厚！只能写出这样的东西！
源码！
Excel类
PHP code class Excel{ var $header = "<?xml version="1.0" encoding="utf-8"?> <Workbook xmlns="urn:schemas-microsoft-com:office:spreadsheet" xmlns:x="urn:schemas-microsoft-com:office:excel" xmlns:ss="urn:schemas-microsoft-com:office:spreadsheet" xmlns:html="http://www.w3.org/TR/REC-html40">"; var $footer = "</Workbook>"; var $lines = array (); var $worksheet_title = "Table1"; function addRow ($array) { $cells = ""; foreach ($array as $k => $v): if(is_numeric($v)) { if(substr($v, 0, 1) == 0) { $cells .= "<Cell><Data ss:Type="String">" . $v . "</Data></Cell>n"; } else { $cells .= "<Cell><Data ss:Type="Number">" . $v . "</Data></Cell>n"; } } else { $cells .= "<Cell><Data ss:Type="String">" . $v . "</Data></Cell>n"; } endforeach; $this->lines[] = "<Row>n" . $cells . "</Row>n"; unset($arry); } function setWorksheetTitle ($title) { $title = preg_replace ("/[\|:|/|?|*|[|]]/", "", $title); $title = substr ($title, 0, 31); $this->worksheet_title = $title; } function generateXML ($filename) { // deliver header (as recommended in PHP manual) header("Content-Type: application/vnd.ms-excel; charset=utf-8"); header("Content-Disposition: inline; filename="" . $filename . ".xls""); // print out document to the browser // need to use stripslashes for the damn ">" echo stripslashes ($this->header); echo "n<Worksheet ss:Name="" . $this->worksheet_title . "">n<Table>n"; echo "<Column ss:Index="1" ss:AutoFitWidth="0" ss:Width="110"/>n"; echo implode ("n", $this->lines); echo "</Table>n</Worksheet>n"; echo $this->footer; exit; } function write ($filename) // 重点 { $content= stripslashes ($this->header); $content.= "n<Worksheet ss:Name="" . $this->worksheet_title . "">n<Table>n"; $content.= "<Column ss:Index="1" ss:AutoFitWidth="0" ss:Width="110"/>n"; $content.= implode ("n", $this->lines); $content.= "</Table>n</Worksheet>n"; $content.= $this->footer;//EXCEL文件 //error_log($content, 3,$filename); if (!file_exists($filename))//判断有没有文件 { fopen($filename,'a'); } $fp = fopen($filename,'a'); fwrite($fp, $content);//写入文件 fclose($fp); unset($this->lines);//清空内存中的数据 } } |
