thinkphp to judge the state value syntax

In the thinkphp framework we often use the judgment of the state value: But this writing can cause a syntax error.

<p>    <if condition= "{$res. Status} eq ' 0 ' > Test </if></p>

2. Correct wording: Because in the thinkphp can not use "." Grammar

<if condition= "$res [' status '] eq 0" > Testing </if>

The f tag contains the parsing of PHP, and if it is written in {} tag parsing, it will not conform to PHP syntax error.
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