PHP float/double stored as MySQL DECIMAL

Question

i ran into a really strange problem with storing values in MySQL. The premise:

I have a table that uses DECIMAL(15,8) to store monetary values (like the total of order), but when i try to insert for example:

2,45545345

this is stored as

2.00000000

I tried MySQL's FORMAT/CAST functions but still the same output.

This is how the query gets generated:

$db->query("INSERT INTO `random_table_name` SET currency_value = '" . floatval($value) . "'");

i also tried doubleval, but same result. The funny thing is though that this same piece of code was working fine a couple of weeks ago and i can't recall any changes to the db structure or the db class that can cause this.

Solution 1

Use number_format to replace the , with .

Like this:

number_format($value, 8, '.') // 8 = number of decimals, . = decimal separator

However, your problem seems to be related to the current locale. You need to look into the following: setlocale() and localeconv

setlocale(LC_ALL, 'en_US'); // NOT TESTED, read up on the appropriate syntax

This is the appropriate way of doing this, the alternative would be (as suggested below), to do a str_replace(',', '.'), but you have to do the reverse every time you want to output strings.

There is another option though, you can set the MySQL locale to en_US.

Solution 2

Replace the , with . before inserting into db:

$value = str_replace( ',', '.', $value);

This will create a valid number, that can be safely inserted into the database. Or just add it just inside your query:

INSERT INTO `random_table_name` SET currency_value = '" . str_replace( ',', '.', $value ) . "'