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When generated automatically, the generated output validates as HTML 4.01 Strict, XHTML 1.0 Strict or HTML5, and has the same look & feel across all major browsers like Firefox, Chrome, Opera, Safari and Internet Explorer 6+.
It provides all the controls you’d expect in an HTML form and, additionally, date/time pickers, CAPTCHA and advanced AJAX-like file upload controls – see the documentation for validation rules that can be used out of the box.
It also prevents automated SPAM posts, out of the box and without relying on CAPTCHA by using honeypots.
In general, this validates e-mail addresses against the syntax in RFC 822, with the exceptions that comments and whitespace folding 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 The description for FILTER_VALIDATE_URL seems incorrect/misleading.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] ftp://example.org/rfc/rfc1808[PASS] gopher://spinaltap.example.edu/00/Weather/California/Los%20Angeles [PASS] mailto:[email protected][PASS] news:comp.[PASS] telnet://example.edu/ [PASS] ldap://[2001:db8::7]/c=GB? "Beware a valid URL may not specify the HTTP protocol" implies a valid URL cannot specify the HTTP protocol.