resolve some errors in php logic, like strlen with str containing space that is interpreted as array instead of string

plug/map_prof/scripts/mp_draw_clusters.js

@@ -0,0 +1,58 @@
+function draw_clusters(map, markers) {
+
+	/*
+	 * following variable are created by mp_add_to_script.php
+	 * - let icon_color = ""
+	 * - let icon_color_back = ""
+	 * - let icon_size = [x, y]
+	 * - let icon_size_factor = Number
+	 * - let icon_stroke_width = Number
+	 */
+
+	let icon_circle_radius = 40 - icon_stroke_width / 2;
+
+	let renderer = {
+		render({ count, position }, stats) {
+
+			/* CLUSTERS SETTINGS */
+
+			let marker_icon_size = [
+				icon_size[0] + ( icon_size_factor * (count - 2) ),
+				icon_size[1] + ( icon_size_factor * (count - 2) )
+			];
+			let cluster_svg = window.btoa(`
+				<svg xmlns="http://www.w3.org/2000/svg" width="${marker_icon_size[0]}" height="${marker_icon_size[1]}">
+					<circle cx="50%" cy="50%" r="${icon_circle_radius}%" stroke="${icon_color}" stroke-width="${icon_stroke_width}" fill="${icon_color_back}" />
+				</svg>
+			`);
+			let cluster_icon = {
+				url: `data:image/svg+xml;base64,${cluster_svg}`,
+				scaledSize: new google.maps.Size(marker_icon_size[0], marker_icon_size[1]),
+			};
+			let cluster_label = {
+				text: String(count),
+				color: icon_color,
+				fontSize: "12px",
+				fontWeight: "bold",
+			};
+			let cluster_title = `Cluster of ${count} markers`;
+			let cluster_zIndex = Number(google.maps.Marker.MAX_ZINDEX) + count;
+
+			return new google.maps.Marker({
+				position,
+				icon: cluster_icon,
+				label: cluster_label,
+				title: cluster_title,
+				zIndex: cluster_zIndex,
+			});
+		}
+	}
+
+	let onClusterClick = (_, cluster, map) => {
+		restrict_map(false);
+		map.fitBounds(cluster.bounds);
+		restrict_map(true);
+	};
+
+	return new markerClusterer.MarkerClusterer({ map, markers, renderer, onClusterClick });
+}