$arr = array("php", "c", "c++", "c#", "python", "java", "go");
if (($key = array_search('python', $arr)) !== false) {
unset($arr[$key]);
}
array_splice($arr, 0, 0);
print_r($arr);
/*
run:
Array
(
[0] => php
[1] => c
[2] => c++
[3] => c#
[4] => java
[5] => go
)
*/