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MagpieRSS::error( $errormsg, $lvl = E_USER_WARNING )

Source

function error( $errormsg, $lvl = E_USER_WARNING ) {
	if ( MAGPIE_DEBUG ) {
		wp_trigger_error('', $errormsg, $lvl);
	} else {
		error_log( $errormsg, 0);
	}
}

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Licensed under the GNU GPLv2+ License.
https://developer.wordpress.org/reference/classes/magpierss/error