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Just check if NULL is among the returned elements and you're done.
For the correct behavior, do a zero check.$value = " 0 ";$filtered = filter_var($value, FILTER_VALIDATE_INT);if($filtered || $filtered === 0) The description for FILTER_VALIDATE_URL seems incorrect/misleading.
"Beware a valid URL may not specify the HTTP protocol" implies a valid URL cannot specify the HTTP protocol.
If FILTER_NULL_ON_FAILURE is not used then NULL is returned when the variable name is not set in the external variable array, TRUE is returned for "1", "true", "on" and "yes" and FALSE is returned for everything else.
Contrary to what documentation implies, the FILTER_NULL_ON_FAILURE seem to affect any validation filter, not just FILTER_VALIDATE_BOOLEAN.
When the flag is used on a validation filter other than FILTER_VALIDATE_BOOLEAN, as expected the filter will return NULL instead of FALSE upon failure.
This is quite useful when filtering a POST form with filter_input_array(), where you don't want to check what field is invalid and what field is missing.Validates whether the value is a valid e-mail address.In general, this validates e-mail addresses against the syntax in RFC 822, with the exceptions that comments and whitespace folding and dotless domain names are not supported. [email protected][PASS] news:comp.[FAIL] tel: 1-816-555-1212 [PASS] telnet://192.0.2./ [FAIL] urn:oasis:names:specification:docbook:dtd:xml:4.1.2 Notably missing is a way to validate text entry as printable,printable multiline,or printable and safe (tag free)FILTER_VALIDATE_TEXT, which validates no special charactersperhaps with FILTER_FLAG_ALLOW_NEWLINEand FILTER_FLAG_NOTAG to disallow tag starters A word to the wise regarding floats.$t = '312041.25 € instead of 896.70 €';echo filter_var ($t, FILTER_SANITIZE_NUMBER_FLOAT, FILTER_FLAG_ALLOW_FRACTION);will return312041.25896.70which is likely not what you were expecting.There are several ways available to validate an AMP document.They will all produce the exact same result, so use whichever one suits your development style the most.Take the following:$value = "12";if(filter_var($value, FILTER_VALIDATE_INT))The above works as intended, except when $value = "0".Tags: Adult Dating, affair dating, sex dating