Ord pages second example doesn't run, produces an error

[imaginedbyme]

From manual page: https://php.net/function.ord

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Pressing the "Run Code" button for "Example #2 Examining the individual bytes of a UTF-8 string" produces the following error:

Warning: declare(encoding=...) ignored because Zend multibyte feature is turned off by settings in php-wasm run script on line 2
Fatal error: Encoding declaration pragma must be the very first statement in the script in php-wasm run script on line 2

[damianwadley]

I've added this to #4353.