Checks whether the specified email name is valid.
Syntax
public static function mailname ($mail_name)
Parameters
mail_name
A string value that specifies the email name to check.
Returns
An integer which is 1 if the email name is considered valid, 0 otherwise.
Remarks
A valid name of the email specified in the mail_name parameter can contain letters, digits, dots, '_' (underscore), '+' and '-' (hyphen) characters. It should begin with a letter, digit, underscore, or a hyphen. E.g. ann.miller-77.
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