wikimedia / mediawiki

	 * @param array $params User provided set of parameters, as from $this->extractRequestParams()

	 * @param string $required,... Names of parameters of which at most one must be set

	 */

	public function requireMaxOneParameter( $params, $required /*...*/ ) {

		$required = func_get_args();

		array_shift( $required );

		$p = $this->getModulePrefix();

		$intersection = array_intersect( array_keys( array_filter( $params,

			[ $this, 'parameterNotEmpty' ] ) ), $required );

		if ( count( $intersection ) > 1 ) {

			$this->dieUsage(

				"The parameters {$p}" . implode( ", {$p}", $intersection ) . ' can not be used together',

				'invalidparammix'

			);

		}

	}

	/**

	 * Die if none of a certain set of parameters is set and not false.

	 * @param array $params User provided set of parameters, as from $this->extractRequestParams()

	 * @param string $required,... Names of parameters of which at least one must be set

	 */

	public function requireAtLeastOneParameter( $params, $required /*...*/ ) {

		$required = func_get_args();

		array_shift( $required );

		$p = $this->getModulePrefix();

		$intersection = array_intersect(

			array_keys( array_filter( $params, [ $this, 'parameterNotEmpty' ] ) ),

			$required

		);

		if ( count( $intersection ) == 0 ) {

			$this->dieUsage( "At least one of the parameters {$p}" .

				implode( ", {$p}", $required ) . ' is required', "{$p}missingparam" );

		}

	}

	/**

	 * Die if any of the specified parameters were found in the query part of