1--TEST-- 2filter_var() and FILTER_SANITIZE_STRING 3--SKIPIF-- 4<?php if (!extension_loaded("filter")) die("skip"); ?> 5--FILE-- 6<?php 7 8var_dump(filter_var("", FILTER_SANITIZE_STRING)); 9var_dump(filter_var("<>", FILTER_SANITIZE_STRING)); 10var_dump(filter_var("<>!@#$%^&*()'\"", FILTER_SANITIZE_STRING, FILTER_FLAG_NO_ENCODE_QUOTES)); 11var_dump(filter_var("<>!@#$%^&*()'\"", FILTER_SANITIZE_STRING, FILTER_FLAG_ENCODE_AMP)); 12var_dump(filter_var("<>`1234567890", FILTER_SANITIZE_STRING)); 13var_dump(filter_var("`123`", FILTER_SANITIZE_STRING)); 14var_dump(filter_var(".", FILTER_SANITIZE_STRING)); 15 16echo "Done\n"; 17?> 18--EXPECT-- 19string(0) "" 20string(0) "" 21string(12) "!@#$%^&*()'"" 22string(24) "!@#$%^&*()'"" 23string(11) "`1234567890" 24string(5) "`123`" 25string(1) "." 26Done 27