函数原型:
is_email( string $email, bool $deprecated = false ): string|false
验证电子邮件是否有效。
参数说明:
$email 要检查的邮件地址。
函数源码:
function is_email( $email, $deprecated = false ) {
if ( ! empty( $deprecated ) ) {
_deprecated_argument( __FUNCTION__, '3.0.0' );
}
// Test for the minimum length the email can be.
if ( strlen( $email ) < 6 ) {
return apply_filters( 'is_email', false, $email, 'email_too_short' );
}
// Test for an @ character after the first position.
if ( strpos( $email, '@', 1 ) === false ) {
/** This filter is documented in wp-includes/formatting.php */
return apply_filters( 'is_email', false, $email, '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 ) ) {
/** This filter is documented in wp-includes/formatting.php */
return apply_filters( 'is_email', false, $email, 'local_invalid_chars' );
}
// DOMAIN PART
// Test for sequences of periods.
if ( preg_match( '/\.{2,}/', $domain ) ) {
/** This filter is documented in wp-includes/formatting.php */
return apply_filters( 'is_email', false, $email, 'domain_period_sequence' );
}
// Test for leading and trailing periods and whitespace.
if ( trim( $domain, " \t\n\r\0\x0B." ) !== $domain ) {
/** This filter is documented in wp-includes/formatting.php */
return apply_filters( 'is_email', false, $email, 'domain_period_limits' );
}
// Split the domain into subs.
$subs = explode( '.', $domain );
// Assume the domain will have at least two subs.
if ( 2 > count( $subs ) ) {
/** This filter is documented in wp-includes/formatting.php */
return apply_filters( 'is_email', false, $email, '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 ) {
/** This filter is documented in wp-includes/formatting.php */
return apply_filters( 'is_email', false, $email, 'sub_hyphen_limits' );
}
// Test for invalid characters.
if ( ! preg_match( '/^[a-z0-9-]+$/i', $sub ) ) {
/** This filter is documented in wp-includes/formatting.php */
return apply_filters( 'is_email', false, $email, 'sub_invalid_chars' );
}
}
// Congratulations, your email made it!
/** This filter is documented in wp-includes/formatting.php */
return apply_filters( 'is_email', $email, $email, null );
}
可以看出,这个函数还是很复杂的。所以,在 WordPress 中最好使用 is_email 函数,不必自己造轮子了。
包含钩子:
apply_filters( 'is_email', string|false $is_email, string $email, string $context )
使用举例:
if ( is_email( 'email@domain.com' ) ) {
echo 'email address is valid.';
}
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