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<?php //echo is_email('""<script>alert(\'haxxor\')</script>"@domain.com'); echo is_email('"</script>"@domain.com'); function is_email( $email, $deprecated = false ) { if ( ! empty( $deprecated ) ) _deprecated_argument( __FUNCTION__, '3.0' ); // Test for the minimum length the email can be if ( strlen( $email ) < 3 ) { return 'email_too_short' ; } // Test for an @ character after the first position if ( strpos( $email, '@', 1 ) === false ) { return 'email_no_at' ; } // Split out the local and domain parts list( $local, $domain ) = explode( '@', $email, 2 ); // LOCAL PART // Test for invalid characters if ( !preg_match( '/^[a-zA-Z0-9!#$%&\'*+\/=?^_`{|}~\.-]+$/', $local ) ) { return 'local_invalid_chars' ; } // DOMAIN PART // Test for sequences of periods if ( preg_match( '/\.{2,}/', $domain ) ) { return 'domain_period_sequence'; } // Test for leading and trailing periods and whitespace if ( trim( $domain, " \t\n\r\0\x0B." ) !== $domain ) { return 'domain_period_limits' ; } // Split the domain into subs $subs = explode( '.', $domain ); // Assume the domain will have at least two subs if ( 2 > count( $subs ) ) { return 'domain_no_periods' ; } // Loop through each sub foreach ( $subs as $sub ) { // Test for leading and trailing hyphens and whitespace if ( trim( $sub, " \t\n\r\0\x0B-" ) !== $sub ) { return'sub_hyphen_limits'; } // Test for invalid characters if ( !preg_match('/^[a-z0-9-]+$/i', $sub ) ) { return 'sub_invalid_chars'; } } // Congratulations your email made it! return 'is_email'; }
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
local_invalid_chars