本文实例讲述了PHP二维数组实现去除重复项的方法。分享给大家供大家参考,具体如下:
对于如下二维数组,要求对其进行去重:
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$arr = array (
'0' => array (
'name' => 'james' ,
'age' =>30,
),
'1' => array (
'name' => 'susu' ,
'age' =>26,
),
'2' => array (
'name' => 'james' ,
'age' =>30,
),
'new' => array (
'name' => 'kube' ,
'age' =>37,
),
'list' => array (
'name' => 'kube' ,
'age' =>27,
),
);
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1、 二维数组内部的一维数组中的值不能完全相同,删除其中重复的项:
代码如下:
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<?php
$arr = array (
'0' => array (
'name' => 'james' ,
'age' =>30,
),
'1' => array (
'name' => 'susu' ,
'age' =>26,
),
'2' => array (
'name' => 'james' ,
'age' =>30,
),
'new' => array (
'name' => 'kube' ,
'age' =>37,
),
'list' => array (
'name' => 'kube' ,
'age' =>27,
),
);
printf( "Before tranform the array:<br>" ); //输出原来的数组
print_r( $arr );
echo "<br/>" ;
function more_array_unique( $arr = array ()){
foreach ( $arr [0] as $k => $v ){
$arr_inner_key []= $k ; //先把二维数组中的内层数组的键值记录在在一维数组中
}
foreach ( $arras $k => $v ){
$v =join( "," , $v ); //降维 用implode()也行
$temp [ $k ] = $v ; //保留原来的键值 $temp[]即为不保留原来键值
}
printf( "After split the array:<br>" );
print_r( $temp ); //输出拆分后的数组
echo "<br/>" ;
$temp = array_unique ( $temp ); //去重:去掉重复的字符串
foreach ( $tempas $k => $v ){
$a = explode ( "," , $v ); //拆分后的重组 如:Array( [0] => james [1] => 30 )
$arr_after [ $k ]= array_combine ( $arr_inner_key , $a ); //将原来的键与值重新合并
}
//ksort($arr_after);//排序如需要:ksort对数组进行排序(保留原键值key) ,sort为不保留key值
return $arr_after ;
}
$arr_new = more_array_unique( $arr ); //调用去重函数
printf( "Duplicate removal of the array:<br>" );
print_r( $arr_new );
echo "<br/>" ;
?>
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输出结果:
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Before tranform the array : //原来数组
Array ( [0] => Array ( [name] => james [age] => 30 ) [1] => Array ([name] => susu [age] => 26 ) [2] => Array ( [name] => james [age]=> 30 ) [ new ] => Array ( [name] => kube [age] => 37 ) [list] =>Array ( [name] => kube [age] => 27 ) )
After split the array : //拆分后数组
Array ( [0] => james,30 [1] => susu,26 [2] => james,30 [ new ] =>kube,37 [list] => kube,27 )
Duplicate removal of thearray: //去重后数组
Array ( [0] => Array ( [name] => james [age] => 30 ) [1] => Array ([name] => susu [age] => 26 ) [ new ] => Array ( [name] => kube [age]=> 37 ) [list] => Array ( [name] => kube [age] => 27 ) )
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2、 二维数组内部的一维数组因某一个键值不能相同,删除重复项:
针对某一个键值来进行去重
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<?php
$arr = array (……); //同上的二维数组
functionsecond_array_unique_bykey( $arr , $key ){
$tmp_arr = array ();
foreach ( $arr as $k => $v )
{
if (in_array( $v [ $key ], $tmp_arr )) //搜索$v[$key]是否在$tmp_arr数组中存在,若存在返回true
{
unset( $arr [ $k ]); //销毁一个变量 如果$tmp_arr中已存在相同的值就删除该值
}
else {
$tmp_arr [ $k ] = $v [ $key ]; //将不同的值放在该数组中保存
}
}
//ksort($arr); //ksort函数对数组进行排序(保留原键值key) sort为不保留key值
return $arr ;
}
$key = 'name' ;
$arr_key = second_array_unique_bykey( $arr , $key );
printf( "As for the givenkey->%s:<br>" , $key );
print_r( $arr_key );
echo "<br/>" ;
?>
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输出结果:
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As for the given key->name:
Array ( [0] => Array ( [name] => james [age] => 30 ) [1] => Array ([name] => susu [age] => 26 ) [ new ] => Array ( [name] => kube [age]=> 37 ) )
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PS:本站还有两款比较简单实用的在线文本去重复工具,推荐给大家使用:
在线去除重复项工具:https://tool.zzvips.com/t/quchong/
在线文本去重复工具:https://tool.zzvips.com/t/txtquchong/
希望本文所述对大家PHP程序设计有所帮助。
原文链接:http://blog.csdn.net/dalaoadalaoa/article/details/47913791