php关于数组的问题

array (size=3)  0 =>     array (size=3)      0 =>         array (size=3)          'welfareName' => string '包吃住' (length=9)          'welfareIco' => string 'url_1' (length=5)          'xyId' => int 1      1 =>         array (size=3)          'welfareName' => string '头等舱' (length=9)          'welfareIco' => string 'url_2' (length=5)          'xyId' => int 1      2 =>         array (size=3)          'welfareName' => string '有车' (length=6)          'welfareIco' => string 'url_4' (length=5)          'xyId' => int 1  1 =>     array (size=2)      0 =>         array (size=3)          'welfareName' => string '头等舱' (length=9)          'welfareIco' => string 'url_2' (length=5)          'xyId' => int 2      1 =>         array (size=3)          'welfareName' => string '买买买' (length=9)          'welfareIco' => string 'url_3' (length=5)          'xyId' => int 2 ---------------------------------------------------------array (size=3)  0 =>     array (size=11)      'xyId' => int 1      'xyLocation' => string '首尔' (length=6)      'commentNum' => int 3      'visitorNum' => int 1  1 =>     array (size=11)      'xyId' => int 2      'xyLocation' => string '东京' (length=6)      'commentNum' => int 0      'visitorNum' => int 1--------------------------------------------------------------------------------array (size=3)  0 =>     array (size=11)      'xyId' => int 1      'xyLocation' => string '首尔' (length=6)      'commentNum' => int 3      'visitorNum' => int 1      'welfare' =>		array (size=3)			  0 => 				array (size=3)				  'welfareName' => string '包吃住' (length=9)				  'welfareIco' => string 'url_1' (length=5)				  'xyId' => int 1			  1 => 				array (size=3)				  'welfareName' => string '头等舱' (length=9)				  'welfareIco' => string 'url_2' (length=5)				  'xyId' => int 1			  2 => 				array (size=3)				  'welfareName' => string '有车' (length=6)				  'welfareIco' => string 'url_4' (length=5)				  'xyId' => int 1       	  1 =>     array (size=11)      'xyId' => int 2      'xyLocation' => string '东京' (length=6)      'commentNum' => int 0      'visitorNum' => int 1	  'welfare' => 		array (size=2)			  0 => 				array (size=3)				  'welfareName' => string '头等舱' (length=9)				  'welfareIco' => string 'url_2' (length=5)				  'xyId' => int 2			  1 => 				array (size=3)				  'welfareName' => string '买买买' (length=9)				  'welfareIco' => string 'url_3' (length=5)				  'xyId' => int 2

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回复讨论(解决方案)

相当于把第一个数组作为第二个数组的一个键对应的值，请问该怎么实现实现第三个数组啊

求解决啊~~~~~~

for($i=0; $i 
 
  
$arr1=array(    array (        array (          'welfareName' => '包吃住',          'welfareIco' => 'url_1',          'xyId' => 1		  ),		array (          'welfareName' => '头等舱',          'welfareIco' => 'url_2',          'xyId' =>1		  ),		array (          'welfareName' =>'有车',          'welfareIco' => 'url_4',          'xyId' =>1		  )	),  array (      array (          'welfareName' => '头等舱',          'welfareIco' => 'url_2',          'xyId' =>2		 ),      array (          'welfareName' => '买买买',          'welfareIco' => 'url_3',          'xyId' =>2		  )	));$arr2=array(	array (      'xyId' => 1,      'xyLocation' => '首尔',      'commentNum' =>3,      'visitorNum' =>1,	  ),	array (      'xyId' =>  2,      'xyLocation' =>  '东京',      'commentNum' =>  0,      'visitorNum' =>  1,	  ));foreach($arr1 as $k=>$v){	$new[$v[0]['xyId']]=$v;}foreach($arr2 as $k=>$v){	$arr2[$k]['welfare']=$new[$v['xyId']];}
 
 
  
   
$arr1=array(    array (        array (          'welfareName' => '包吃住',          'welfareIco' => 'url_1',          'xyId' => 1		  ),		array (          'welfareName' => '头等舱',          'welfareIco' => 'url_2',          'xyId' =>1		  ),		array (          'welfareName' =>'有车',          'welfareIco' => 'url_4',          'xyId' =>1		  )	),  array (      array (          'welfareName' => '头等舱',          'welfareIco' => 'url_2',          'xyId' =>2		 ),      array (          'welfareName' => '买买买',          'welfareIco' => 'url_3',          'xyId' =>2		  )	));$arr2=array(	array (      'xyId' => 1,      'xyLocation' => '首尔',      'commentNum' =>3,      'visitorNum' =>1,	  ),	array (      'xyId' =>  2,      'xyLocation' =>  '东京',      'commentNum' =>  0,      'visitorNum' =>  1,	  ));foreach($arr1 as $k=>$v){	$new[$v[0]['xyId']]=$v;}foreach($arr2 as $k=>$v){	$arr2[$k]['welfare']=$new[$v['xyId']];}
  
  
 这个解决了，我对数组理解不够深刻  
  多练多写，就深刻了 
 
  
   多练多写，就深刻了  
  
 受教了  
  
   
for($i=0; $i  
  
 版主的这个，也能实现，但是会多出好多多余数组，同样感谢