Description:
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Trying to remove/convert any non-utf8 character to an html equivalent, x is being replaced when it shouldn't.

The ord value of x is 120. The ord value of Y diaeresis is suppose to be 376.

Reproduce code:
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$string = "x";

echo $string;

$string = ereg_replace(376,"Ÿ",$string);

echo $string;

Expected result:
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x should still be echo'd the second time.

Actual result:
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Y diaeresis is being echo'd out.