Converting a number with comma as decimal point to float

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Using str_replace() to remove the dots is not overkill.

$string_number="1.512.523,55";
// NOTE: You don't really have to use floatval() here, it's just to prove that it's a legitimate float value.
$number = floatval(str_replace(',', '.', str_replace('.', '', $string_number)));

// At this point, $number is a "natural" float.
print $number;

This is almost certainly the least CPU-intensive way you can do this, and odds are that even if you use some fancy function to do it, that this is what it does under the hood.

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