Float Precision

PHP has a precision directive that controls the number of decimals displayed by float values. This is used with echo (and co), but also with cast to string.

It default to 14, and peaks at 18, and gives up at 54. Use gmp or bcmath for large numbers.

When changing it, don’t forget to reset it to default, unless you like to puzzle people.

See Also

• precision (PHP manual)

• precision [Try me]

PHP Features

• integer

• gmp

• bcmath