摘要： 正确：<?php $arr = array( "a" => array( "a" => "1", ), ); foreach ($arr as $a => &$trdata) { $trdata['b'] = $trdata['a']; } var_dump($arr);?>错误：<?php $arr = array( "a" => array( "a" => "1", ), ); for 阅读全文