Bug #11338 Updated: arraydiff returns a vector with "empty" values for found values

ID: 11338 Updated by: jeroen Reported By: Jean-Pierre.Malisse@mumm.ac.be Old Status: Open Status: Bogus Bug Type: Arrays related Operating System: True64Unix 5.1 PHP Version: 4.0.5 New Comment: Both array_diff and array_intersect preserve keys. I don't see the problem here? array_diff and array_intersect are completely symmetric. var_dump(array_intersect(array('a','b'), array('b'))); var_dump(array_diff (array('a','b'), array('a'))); array(1) { [1]=> string(1) "b" } array(1) { [1]=> string(1) "b" } Previous Comments: ------------------------------------------------------------------------ [2001-06-07 16:07:50] Jean-Pierre.Malisse@mumm.ac.be Hi, I found the following behaviour not normal....and at least not reflecting what is said in the documentation using arraydiff alone returns >*en#nl there is an empty value field at the place of the "removed" component of the array There is an empty field between > and * !! $lang=array("fr","en","nl"); $lg1=array("fr"); $olang=(array_diff($lang,$lg1); echo ">",$olang[0],"*",$olang[1],"#",$olang[2],"\n"; The resulting vector is not shorter !! 1) This is not matching what is said in the documentation and can makes a programmer loose time trying to find why it is not working as he expected,.... We would have expected a behaviour closer to array_intersect which is returning an array with only the significant values...! 2) this is removing symetry of behaviour of array_diff compared to array_intersect.... The following workaround solves the problem, but needs at least to CLEARLY be mentioned in the documentation of the usage of the array_diff function, if it would not be planned to improve the behaviour of the function in the expected way.... $olang=array_values(array_diff($lang,$lg1)); echo "2>",$olang[0],"*",$olang[1],"#",$olang[2],"\n"; regards, Jean-Pierre.Malisse@mumm.ac.be ------------------------------------------------------------------------ Edit this bug report at http://bugs.php.net/?id=11338&edit=1