All error messages are stored in an array with a specific index that cannot be changed. This index is used in the library to reference a specific error message.
Since error messages can also have additional parameters the error messages also includes count that specifies how many arguments must be handled to enable some error checking when using the error message in the code (to make sure we have enough arguments).
The arguments are formatted in the error text in the same way as parameters in the
printf() family of functions.
To create a localized error resource file You should first copy the
en.inc.php" to a temporary file, rename it according to
the locale you are creating and then translate each error message according to the
locale. The make sure that the file is stored under the
jpgraph/lang/" catalogue and the new localized error
messages can be used.
For example. To create a French version of the error messages the
lang/en.inc.php should be copied to
lang/fr.inc.php and the error messages translated. The
French locale can then be used by using the string "
fr" as identified
SettErrLocale() as described above.