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    <p>Clearly your bug is that you are manipulating UTF‑8–encoded Unicode as though those bytes were ISO‐8859‑1. </p> <p>I cannot see where this is happening; probably in your call to <code>htmlentities</code>, whatever that is. </p> <p>It may need to use some sort of “multibyte” hack, perhaps including such things as this sort of pattern:</p> <pre><code>/([^\x00-\x7F])/u </code></pre> <p>wiht an explicit <code>/u</code> so it works on logical code points instead of 8‑bit code units (read: bytes). It might do this to grab one non-ASCII code point so it can replace it with a numeric entity. Without the easily forgotten <code>/u</code>, it would work on bytes not code points, which matches what your description shows happening.</p> <p>It could be this sort of thing, or it might be that you have to swap over to some of the <code>mb_*()</code> functions instead of normal ones. This is to work around the fundamental underlying PHP bug that there it no real Unicode support in the language, just a few band-aides here and there that seem to like to fall off from time to time for no good reason.</p> <p>If you could use a clean language with not just proper Unicode support but also a clear separation between physical bytes and abstract characters, this sort of thing would not be happening. But I bet it’s a common problem that others must be having too, so I would be really surprised if it were a library bug instead of a (perfectly understandable!) oversight somewhere in your code.</p>
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