Some Php functions recoded
-array_key_exists
-array_keys
-array_pop
-array_push
-array_search
-array_shift
-array_values
-chr
-count
-explode
-implode
-in_array
-is_prime
-ord
-sort
-str_repeat
-strlen
-strpos
-strrev
-strstr
-strtolower
-strtoupper
-trim
-ucfirst
-ucwords