回答編集履歴
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例を追加
test
CHANGED
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例：
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```php
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<?php
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11
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$str = "A 'quote' is <b>bold</b>";
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// 出力: A 'quote' is <b>bold</b>
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echo htmlentities($str);
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// 出力: A 'quote' is <b>bold</b>
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echo htmlentities($str, ENT_QUOTES);
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?>
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```
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5
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参考：[htmlentities()](http://php.net/manual/ja/function.htmlentities.php)
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