How can you transform a string that contains a number expressed in scientific notation into a double in PHP?

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You can use the floatval function in PHP to transform a string containing a number expressed in scientific notation into a double. Here's an example:

$string = '2.5e-6';
$double = floatval($string);

In this example, the string $string contains the number 2.5 x 10^-6 expressed in scientific notation. The floatval function converts this string into a double and assigns it to the variable $double. The resulting value of $double is 0.0000025.