「あ」が「＆＃12354;」になるようなやつ。(&#は半角で)
mb_convert_encoding()でできるのを知った。
// 日本語文字列 -> 数値文字参照
$value = mb_convert_encoding($value, 'HTML-ENTITIES', 'UTF-8');
// 数値文字参照 -> 日本語
$value = mb_convert_encoding($value, 'UTF-8', 'HTML-ENTITIES');
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