PHP 正規表現の複数行マッチングに関連するコード例の解釈_PHP チュートリアル

<ol class="dp-xml"><li class="alt"><span><span class="tag"><</span><span> ?php  </span></span></li><li><span>$</span><span class="attribute">rows</span><span> = </span><span class="attribute-value">file</span><span>('php.ini'); //将php.ini文件读到数组中  </span></li><li class="alt"><span>//循环遍历  </span></li><li><span>foreach($rows as $line)  </span></li><li class="alt"><span>{  </span></li><li><span>If(trim($line))  </span></li><li class="alt"><span>{  </span></li><li><span>//将匹配成功的参数写入数组中  </span></li><li class="alt"><span>if(eregi("^([a-z0-9_.]*) *=(.*)", $line, $matches))  </span></li><li><span>{  </span></li><li class="alt"><span>$options[$matches[1]] = trim($matches[2]);  </span></li><li><span>}  </span></li><li class="alt"><span>unset($matches);  </span></li><li><span>}  </span></li><li class="alt"><span>}  </span></li><li><span>//输出参数结果  </span></li><li class="alt"><span>print_r($options);  </span></li><li><span class="tag">?></span><span> </span></span></li></ol>