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_shift($Array);