what is the difference between array_udiff_assoc and array_diff_uassoc
for array_udiff_assoc i get this thing
<?php
function myfunction($v1,$v2)
{
if ($v1===$v2)
{
return 0;
}
return 1;
}
$a1=array("a"=>"Cat","b"=>"Dog","c"=>"Horse");
$a2=array("a"=>"Cat","b"=>"Horse","c"=>"Dog");
print_r(array_udiff_assoc($a1,$a2,"myfunction"));
?>
result
Array ( [b] Dog [c] => Horse )
also array_diff_uassoc
<?php
function myfunction($v1,$v2)
{
if ($v1===$v2)
{
return 0;
}
return 1;
}
$a1=array("a"=>"Cat","b"=>"Dog","c"=>"Horse");
$a2=array("a"=>"Cat","b"=>"Horse","c"=>"Dog");
print_r(array_diff_uassoc($a1,$a2,"myfunction"));
?>
result is same as first one
Array ( [b] Dog [c] => Horse )
Is the have any difference, if have what is that. Php manual does not says that they are alias, as they used to say.
They both do the same, but udiff-assoc compares the DATA with the user supplied function, while diff-uassoc compares the INDEX with the user supplied function.
As an answer to @lonsesomeday : as indicated by the 'u', diff_assoc will use internal functions for all comparisons, and udiff_uassoc uses provided callbacks for index and data comparison.
array_udiff_assoc— Computes the difference of arrays with additional index check, compares data by a callback functionarray_diff_uassoc— Computes the difference of arrays with additional index check which is performed by a user supplied callback function
So, the function differ in the place where they use the callback function. udiff_assoc uses the callback to compare elements, diff_uassoc uses the callback when comparing the indices.