PHP实现的大文件切割与合并功能示例

<?php$i  = 0;                 //分割的块编号$fp  = fopen("hadoop.sql","rb");      //要分割的文件$file = fopen("split_hash.txt","a");    //记录分割的信息的文本文件，实际生产环境存在redis更合适while(!feof($fp)){    $handle = fopen("hadoop.{$i}.sql","wb");    fwrite($handle,fread($fp,5242880));//切割的块大小 5m    fwrite($file,"hadoop.{$i}.sql/r/n");    fclose($handle);    unset($handle);    $i++;}fclose ($fp);fclose ($file);echo "ok";

<?php$hash = file_get_contents("split_hash.txt"); //读取分割文件的信息$list = explode("/r/n",$hash);$fp = fopen("hadoop2.sql","ab");    //合并后的文件名foreach($list as $value){  if(!empty($value)) {    $handle = fopen($value,"rb");    fwrite($fp,fread($handle,filesize($value)));    fclose($handle);    unset($handle);  }}fclose($fp);echo "ok";