How to delete one array element from array

i) unset() method $Array = array("test1","test2","test3","test3"); unset($Array[2]); ii) array_diff_key() method $Array = array("test1","test2","test3","test3"); array_pop($Array); iii) array_splice() method $Array = array("test1","test2","test3","test3"); array_splice($Array,1,2); iv) array_diff() method $Array = array("test1","test2","test3","test3"); array_...