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id=40156&edit=2) but it was flagged "not a bug" because these kind of filters are only supposed to filter out illegal characters.Of course if you were to use FILTER_VALIDATE_FLOAT it would just return that the input is not valid.The behavior is mentioned on the filter_input documentation page under Return Values but that is not overly helpful if one is just looking here.If FILTER_NULL_ON_FAILURE is not used then NULL is returned when the variable name is not set in the external variable array, TRUE is returned for "1", "true", "on" and "yes" and FALSE is returned for everything else.In general, this validates e-mail addresses against the syntax in RFC 822, with the exceptions that comments and whitespace folding and dotless domain names are not supported. [email protected][PASS] news:comp.[FAIL] tel: 1-816-555-1212 [PASS] telnet://192.0.2./ [FAIL] urn:oasis:names:specification:docbook:dtd:xml:4.1.2 Notably missing is a way to validate text entry as printable,printable multiline,or printable and safe (tag free)FILTER_VALIDATE_TEXT, which validates no special charactersperhaps with FILTER_FLAG_ALLOW_NEWLINEand FILTER_FLAG_NOTAG to disallow tag starters A word to the wise regarding floats.$t = '312041.25 € instead of 896.70 €';echo filter_var ($t, FILTER_SANITIZE_NUMBER_FLOAT, FILTER_FLAG_ALLOW_FRACTION);will return312041.25896.70which is likely not what you were expecting.FILTER_VALIDATE_URL does not work with URNs, examples of valid URIs according to RFC3986 and if they are accepted by FILTER_VALIDATE_URL: [PASS][PASS] gopher:// Angeles [PASS] mailto:[email protected][PASS] news:comp.[PASS] telnet:// [PASS] ldap://[2001:db8::7]/c=GB? In 2007 someone suggested it's not acceptable (see https://net/bug.php?

I think "Beware a valid URL need not specify..." would be better.I have no clue if it's a blug or if it is as intended, in which case the documentation needs to be fixed.When the flag is used on a validation filter other than FILTER_VALIDATE_BOOLEAN, as expected the filter will return NULL instead of FALSE upon failure.Returns: PHP Version: 5.2.14 //On MY server, may be different depending on which version you have [email protected](16) "[email protected]" This feature is only available for PHP Versions (PHP 5 Regarding "partial" addresses with no .

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