Several ways to deal with elements with the same name in PHP output array

Several ways to deal with elements with the same name in PHP output array_PHP Tutorial

WBOY

Release： 2016-07-21 15:16:46

Original

988 people have browsed it

1. You can directly use PHP’s built-in function array_intersect()
array array_intersect ( array $array1 , array $array2 [, array $ ... ] )
array_intersect() returns an array, This array contains all values in array1 that also appear in all other parameter arrays. Note that the key names remain unchanged.
Code:

Copy code The code is as follows:

 
$array1 = array(" a" => "green", "red", "blue"); 
$array2 = array("b" => "green", "yellow", "red"); 
$result = array_intersect($array1, $array2); 
?> 

Output result:
Array( [a] => green [0] => red)
2. You can also write an algorithm yourself:

Copy the code The code is as follows:

< ?php
function my_array_same($a){
$b = array_unique($a);
$r = array_diff_key($a,$b);
echo "

"; 
$k=var_dump(array_unique($r)); 
return $k; 
} 
$a = array("red", "green", "pink", "red", "yellow","pink", "red"); 
$r=my_array_same($a); 
var_dump(array_unique($r)); 
?>

Output result:
array(2) {
[3]=>
string(3) "red"
[5]=>
string(4) "pink "
}
3. You can also write:

Copy the code The code is as follows:

 
function my_array_intersect($arr1,$arr2){ 
for($i=0;$i$temp[] =$arr1[$i]; 
} 
for($i=0;$i$temp[]=$arr2[$i]; 
} 
sort($temp); 
$get=array(); 
for($i=0;$iif ($temp[$i]==$temp[$i+1]) 
$get[]=$temp[$i]; 
} 
return $get; 
} 
$array1 = array("green", "red", "blue"); 
$array2 = array("green", "yellow", "red"); 
echo "" ; 
print_r(my_array_intersect($array1, $array2)); 
echo ""; 
?> 

If it is a one-dimensional array , the third algorithm is faster than the first one. The above algorithms are all suitable for one-dimensional arrays, so how to find the same elements in multi-dimensional arrays?

Idea: You can convert a multi-dimensional array into a one-dimensional array, and then use the above algorithm to output it.

Code:

Copy code The code is as follows:

 
function toarr($arr){ //Yes The array is recursed and returned as a string 
foreach ($arr as $k=>$v){ 
if (!is_array($v)) { 
$str.=$v." "; 
} 
else{ 
$str.=toarr($v); 
} 
} 
return $str; 
}/*End of recursive function*/ 

The above formula converts the multi-dimensional array into a string, and then uses the expode function to convert it into a one-dimensional array.

Think about it, this is also the case when the database returns the value of a certain field with the same name. Of course, it can also be achieved through sql statements.