回答編集履歴
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修正
answer
CHANGED
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@@ -154,7 +154,7 @@
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154
154
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PHPマニュアル参考先：
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155
155
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[関数引数の型宣言](https://www.php.net/manual/ja/functions.arguments.php#functions.arguments.type-declaration)
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156
156
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[関数返り値の型宣言](https://www.php.net/manual/ja/functions.returning-values.php#functions.returning-values.type-declaration)
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157
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-
三項演算子
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157
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+
[三項演算子](https://www.php.net/manual/ja/language.operators.comparison.php#language.operators.comparison.ternary)
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158
158
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[htmlspecialchars()](https://www.php.net/manual/ja/function.htmlspecialchars.php)
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159
159
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[filter_input()](https://www.php.net/manual/ja/function.filter-input.php)
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160
160
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[検証フィルタ](https://www.php.net/manual/ja/filter.filters.validate.php)
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