php 对多维数组的操作,该怎么解决

<br />$a=array("date"=>array<br />(<br />"msg1"=>"asdasd",<br />"msg2"=>"dasdsa")<br />);<br />/*----------如何将一个数据添加到数组中，使数组输出如下---------------------*/<br />/*   Array ( [date] => Array ( [msg1] => asdasd [msg2] => dasdsa[msg3] => dasdsa[msg4] => dasdsa ) )   */<br />

<br />$a=array("date"=>array("msg1"=>"asdasd","msg2"=>"dasdsa"));<br />array_push($a['date'],array('msg3'=>'tel'));<br />print_r($a);<br />

<br />$a=array();<br />foreach($data as $k=>$v){<br />  $a['date']['msg'.$k]=$v;<br />}<br />print_r($a);<br />

$a=array("date"=>array("msg1"=>"asdasd","msg2"=>"dasdsa"));<br />$a['date']['msg3'] = 'tel';<br />print_r($a);

Array<br />(<br />    [date] => Array<br />        (<br />            [msg1] => asdasd<br />            [msg2] => dasdsa<br />            [msg3] => tel<br />        )<br /><br />)<br /><br />

$a=array("date"=>array("msg1"=>"asdasd","msg2"=>"dasdsa"));<br />$a['date']['msg3'] = 'tel';<br />print_r($a);

<br />Array<br />(<br />    [date] => Array<br />        (<br />            [msg1] => asdasd<br />            [msg2] => dasdsa<br />            [msg3] => tel<br />        )<br /> <br />)<br />

$a=array("date"=>array("msg1"=>"asdasd","msg2"=>"dasdsa"));<br />$a = array_merge_recursive($a, array('date' => array('msg3'=>'tel')));<br />print_r($a);

Array<br />(<br />    [date] => Array<br />        (<br />            [msg1] => asdasd<br />            [msg2] => dasdsa<br />            [msg3] => tel<br />        )<br /><br />)<br /><br />