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			get_user_id_from_string is deprecated since version 3.6.0!
Alternative: get_user_by()
Alternative: get_user_by()
get_user_id_from_string › WordPress Function
Since
Deprecated3.6.0
› get_user_id_from_string ( $email_or_login )
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Get a numeric user ID from either an email address or a login.
A numeric string is considered to be an existing user ID and is simply returned as such.Related Functions: get_user_setting, get_post_format_string, get_post_format_strings, get_user_option, set_user_setting
	Source
function get_user_id_from_string( $email_or_login ) {
	_deprecated_function( __FUNCTION__, '3.6.0', 'get_user_by()' );
	if ( is_email( $email_or_login ) )
		$user = get_user_by( 'email', $email_or_login );
	elseif ( is_numeric( $email_or_login ) )
		return $email_or_login;
	else
		$user = get_user_by( 'login', $email_or_login );
	if ( $user )
		return $user->ID;
	return 0;
}