Get coordinate of marker and limit the values Google Maps

I'm using google maps on my laravel 5.4 project .

I need to to save coordinate ( lat and long) of markers on map, I can do it but when I save it to database it saves too long number like : (35.690833660667444, 51.39251243323088)

now I want to limit this number to 6 characters like this : (35.690833, 51.392512)

but I don't know how , please help me. thanks for any help ;) .

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