What are the implications of using ISO-8859-1 and ISO-8859-15 encoding in PHP scripts for handling special characters like the EUR symbol?

When using ISO-8859-1 encoding in PHP scripts, special characters like the EUR symbol may not be properly handled, as ISO-8859-1 does not include this symbol. To correctly handle special characters like the EUR symbol, it is recommended to use ISO-8859-15 encoding, which includes support for this symbol.

// Set the encoding to ISO-8859-15 to properly handle special characters like the EUR symbol
header('Content-Type: text/html; charset=ISO-8859-15');