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Validates whether the value is a valid e-mail address.

@2:$value = " 0 ";$filtered = filter_var($value, FILTER_VALIDATE_INT);if($filtered

It says FQDNs are permitted, and com, org, or va are (well, may be) valids FQDNs. Some TDLs (although few of them) have MX RRs, the for example "[email protected]" is correct.FILTER_VALIDATE_EMAIL is discarding valid e-mail addresses containing IDN.Since there are real, live IDNs on the Internet, that means the filtered output is too strict, leading to false negatives.Punycode-encoded IDN addresses pass the filter correctly; so before checking for validity, it is necessary to convert the e-mail address to punycode.Often I see some code like the following:$value = "12";if( filter_var($value, FILTER_VALIDATE_INT) ){ // validated as an int}The above works as intended, except when $value is "0". For the correct behavior, you have not only to check if it is equal (==) to false, but also identic (===) to FALSE:$value = " 0 ";if( filter_var($value, FILTER_VALIDATE_INT) === FALSE ){ // validated as an int}I hope, I could help.Contrary to what documentation implies, the FILTER_NULL_ON_FAILURE seem to affect any validation filter, not just FILTER_VALIDATE_BOOLEAN.