190a392d_th_PHP___Page_2___WebReference__Flags
[Filter] FILTER_SANITIZE_ENCODED [Options] No options [Description] URL- encodes a string. Setting the flags optionally strips or encodes characters with an ASCII value of less than 32 (LOW) or greater than 127 (HIGH). [Flags] 
FILTER_FLAG_STRIP_LOW FILTER_FLAG_STRIP_HIGH FILTER_FLAG_ENCODE_LOW FILTER_FLAG_ENCODE_HIGH
Data Filtering with PHP / Page 2 | WebReference
Flags