Array PHP two-dimensional array deduplication problem analysis

I wrote an article about array deduplication before, but it was limited to one-dimensional arrays. The following function can be used for two-dimensional arrays:

Copy the code The code is as follows:

//Remove duplicate values ​​from the two-dimensional array
function array_unique_fb($array2D)
{
foreach ($array2D as $v)
{
$v = join(",",$v); //For dimensionality reduction, you can also use implode to convert the one-dimensional array into a string connected with commas
$temp[] = $v;
}
$temp = array_unique($temp); //Remove repeated strings, that is, repeated one-dimensional arrays
foreach ($temp as $k => $v)
{
$temp[$k] = explode( ",",$v); //Reassemble the disassembled array
}
return $temp;
}

If you want to retain the key value of the array, you can use the following function:

Copy Code The code is as follows:

//Two-dimensional array removes duplicate values ​​and retains key values
function array_unique_fb($array2D)
{
foreach ($array2D as $k=>$v)
{
$v = join(",",$v); //For dimensionality reduction, you can also use implode to convert the one-dimensional array into a string connected with commas
$temp[$k] = $v;
}
$temp = array_unique ($temp); //Remove repeated strings, that is, repeated one-dimensional arrays
foreach ($temp as $k => $v)
{
$array=explode(",",$v); //Reassemble the disassembled array
$temp2[$k]["id"] =$array[0];
$temp2[$k]["litpic"] =$array[1];
$ temp2[$k]["title"] =$array[2];
$temp2[$k]["address"] =$array[3];
$temp2[$k]["starttime"] =$ array[4];
$temp2[$k]["endtime"] =$array[5];
$temp2[$k]["classid"] =$array[6];
$temp2[$k] ["ename"] =$array[7];
}
return $temp2;
}

That's it.
Two-dimensional array deduplication

Copy code The code is as follows:

$arr = array(
array('id' => 1,'name' => 'aaa' ),
array('id' => 2,'name' => 'bbb'),
array('id' => 3,'name' => 'ccc'),
array(' id' => 4,'name' => 'ddd'),
array('id' => 5,'name' => 'ccc'),
array('id' => 6 ,'name' => 'aaa'),
array('id' => 7,'name' => 'bbb'),
);
function assoc_unique(&$arr, $key)
{
$rAr=array();
for($i=0;$i{
if(!isset($rAr[$arr[$i][$key]] ))
{
$rAr[$arr[$i][$key]]=$arr[$i];
}
}
$arr=array_values($rAr);
}
assoc_unique(&$arr, 'name');
print_r($arr);
?>

The above has introduced the analysis of array deduplication of two-dimensional arrays in PHP, including array aspects. I hope it will be helpful to friends who are interested in PHP tutorials.