回答編集履歴
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ミスがあったため修正。
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@@ -1 +1,43 @@
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`==` を `===` にしてみては？
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---
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**追記：**
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失礼しました、` is same as() ` を使うようです。
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【php - How to check for null in Twig? - Stack Overflow】
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[http://stackoverflow.com/questions/3264889/how-to-check-for-null-in-twig](http://stackoverflow.com/questions/3264889/how-to-check-for-null-in-twig)
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【same as - Documentation - Twig - The flexible, fast, and secure PHP template engine】
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[http://twig.sensiolabs.org/doc/2.x/tests/sameas.html](http://twig.sensiolabs.org/doc/2.x/tests/sameas.html)
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> same as checks if a variable is the same as another variable. This is the equivalent to === in PHP:
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> ```PHP
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> {% if foo.attribute is same as(false) %}
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> the foo attribute really is the 'false' PHP value
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> {% endif %}
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> ```
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