PHP备份数据库为SQL文件 并可下载源码

　　这是一个将指定数据库里的所有表备份为一个SQL文件，可下载。这个源码来自dedecms程序，功能挺多，也很实用，但是代码的质量还有待提高

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<li class="alt"><span><span></span></span></li>
<li><span>    </span></li>
<li class="alt">
<span class="comment">/******   备份数据库结构 ******/</span><span>    </span>
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<li><span>      </span></li>
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<span>      </span><span class="comment">/*  </span> </li>
<li><span><span class="comment">      函数名称：table2sql()  </span> </span></li>
<li class="alt"><span><span class="comment">      函数功能：把表的结构转换成为SQL  </span> </span></li>
<li><span><span class="comment">      函数参数：$table: 要进行提取的表名  </span> </span></li>
<li class="alt"><span><span class="comment">      返 回 值：返回提取后的结果，SQL集合  </span> </span></li>
<li><span><span class="comment">      函数作者：heiyeluren  </span> </span></li>
<li class="alt"><span><span class="comment">      */</span><span>    </span></span></li>
<li><span>      </span></li>
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<span>     </span><span class="keyword">function</span><span> table2sql(</span><span class="vars">$table</span><span>)    </span>
</li>
<li><span>      {    </span></li>
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<span>          </span><span class="keyword">global</span><span> </span><span class="vars">$db</span><span>;    </span>
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<span>         </span><span class="vars">$tabledump</span><span> = </span><span class="string">"DROP TABLE IF EXISTS $table;
"</span><span>;    </span>
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<span>         </span><span class="vars">$createtable</span><span> = </span><span class="vars">$db</span><span>--->query(</span><span class="string">"SHOW CREATE TABLE $table"</span><span>);    </span>
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<span>         </span><span class="vars">$create</span><span> = </span><span class="vars">$db</span><span>->fetch_row(</span><span class="vars">$createtable</span><span>);    </span>
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<span>         </span><span class="vars">$tabledump</span><span> .= </span><span class="vars">$create</span><span>[1].</span><span class="string">";

"</span><span>;    </span>
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<li>
<span>          </span><span class="keyword">return</span><span> </span><span class="vars">$tabledump</span><span>;    </span>
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<li class="alt"><span>      }    </span></li>
<li><span>      </span></li>
<li class="alt"><span>      </span></li>
<li>
<span>     </span><span class="comment">/****** 备份数据库结构和所有数据 ******/</span><span>    </span>
</li>
<li class="alt">
<span>      </span><span class="comment">/*  </span> </li>
<li><span><span class="comment">      函数名称：data2sql()  </span> </span></li>
<li class="alt"><span><span class="comment">      函数功能：把表的结构和数据转换成为SQL  </span> </span></li>
<li><span><span class="comment">      函数参数：$table: 要进行提取的表名  </span> </span></li>
<li class="alt"><span><span class="comment">      返 回 值：返回提取后的结果，SQL集合  </span> </span></li>
<li><span><span class="comment">      函数作者：heiyeluren  </span> </span></li>
<li class="alt"><span><span class="comment">      */</span><span>    </span></span></li>
<li>
<span>     </span><span class="keyword">function</span><span> data2sql(</span><span class="vars">$table</span><span>)    </span>
</li>
<li class="alt"><span>      {    </span></li>
<li>
<span>          </span><span class="keyword">global</span><span> </span><span class="vars">$db</span><span>;    </span>
</li>
<li class="alt">
<span>         </span><span class="vars">$tabledump</span><span> = </span><span class="string">"DROP TABLE IF EXISTS $table;
"</span><span>;    </span>
</li>
<li>
<span>         </span><span class="vars">$createtable</span><span> = </span><span class="vars">$db</span><span>->query(</span><span class="string">"SHOW CREATE TABLE $table"</span><span>);    </span>
</li>
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<span>         </span><span class="vars">$create</span><span> = </span><span class="vars">$db</span><span>->fetch_row(</span><span class="vars">$createtable</span><span>);    </span>
</li>
<li>
<span>         </span><span class="vars">$tabledump</span><span> .= </span><span class="vars">$create</span><span>[1].</span><span class="string">";

"</span><span>;    </span>
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<li class="alt"><span>      </span></li>
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<span>         </span><span class="vars">$rows</span><span> = </span><span class="vars">$db</span><span>->query(</span><span class="string">"SELECT * FROM $table"</span><span>);    </span>
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<span>         </span><span class="vars">$numfields</span><span> = </span><span class="vars">$db</span><span>->num_fields(</span><span class="vars">$rows</span><span>);    </span>
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<span>         </span><span class="vars">$numrows</span><span> = </span><span class="vars">$db</span><span>->num_rows(</span><span class="vars">$rows</span><span>);    </span>
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<span>          </span><span class="keyword">while</span><span> (</span><span class="vars">$row</span><span> = </span><span class="vars">$db</span><span>->fetch_row(</span><span class="vars">$rows</span><span>))    </span>
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<li><span>          {    </span></li>
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<span>             </span><span class="vars">$comma</span><span> = </span><span class="string">""</span><span>;    </span>
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<span>             </span><span class="vars">$tabledump</span><span> .= </span><span class="string">"INSERT INTO $table VALUES("</span><span>;    </span>
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">
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