get_cli_args() WordPress Function

function get_cli_args( $param, $required = false ) {
	$args = $_SERVER['argv'];
	if ( ! is_array( $args ) ) {
		$args = array();
	}

	$out = array();

	$last_arg = null;
	$return   = null;

	$il = count( $args );

	for ( $i = 1, $il; $i < $il; $i++ ) {
		if ( (bool) preg_match( '/^--(.+)/', $args[ $i ], $match ) ) {
			$parts = explode( '=', $match[1] );
			$key   = preg_replace( '/[^a-z0-9]+/', '', $parts[0] );

			if ( isset( $parts[1] ) ) {
				$out[ $key ] = $parts[1];
			} else {
				$out[ $key ] = true;
			}

			$last_arg = $key;
		} elseif ( (bool) preg_match( '/^-([a-zA-Z0-9]+)/', $args[ $i ], $match ) ) {
			for ( $j = 0, $jl = strlen( $match[1] ); $j < $jl; $j++ ) {
				$key         = $match[1][ $j ];
				$out[ $key ] = true;
			}

			$last_arg = $key;
		} elseif ( null !== $last_arg ) {
			$out[ $last_arg ] = $args[ $i ];
		}
	}

	// Check array for specified param.
	if ( isset( $out[ $param ] ) ) {
		// Set return value.
		$return = $out[ $param ];
	}

	// Check for missing required param.
	if ( ! isset( $out[ $param ] ) && $required ) {
		// Display message and exit.
		echo "\"$param\" parameter is required but was not specified\n";
		exit;
	}

	return $return;
}