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         <td valign="top" class="name">ISDEFINED</td>
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lɎw肳ꂽϐ݂邩ǂ𒲂ׂ邽߂ɕl]܂B 
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̊֐́Ap~ꂽ ParameterExists ֐̑ƂȂ̂łB
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    <td valign="top" colspan="2" class="description"><span class="title">߂l</span>
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ϐꍇA܂͎w肳ꂽL[\̂Œ`Ăꍇ trueAȊȌꍇ falseB 
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ʕ\LgpĎQƂĂzvf܂͍\̗vfɂĂ false Ԃ܂BƂ΁Azvf myArray[3] ɒl܂܂ĂĂAIsDefined(&quot;myArray[3]&quot;) ͏ false Ԃ܂B 
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֐
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    <td valign="top" colspan="2" class="description"><span class="title">֐̃V^bNX</span><pre>IsDefined(&quot;variable_name&quot;)
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Evaluate
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    <td valign="top" colspan="2" class="description"><span class="title">qXg</span>
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ColdFusion&#160;MX: ̕ύX : ̊֐́Â悤ȕϐэ\݂̂̂ł܂B
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<li>Pȕϐ</li>

<li>hbg\L̖Oϐ</li>

<li>hbg\L̖O\ ( : mystruct.key)</li>
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ColdFusion \̂ƂČJĂXR[vgpƂɂ́Å֐̑ StructKeyExists ֐gpłꍇ܂B 2 ̍s͓łB 
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<pre>if(isDefined(&quot;form.myVariable&quot;))
if(structKeyExists(form,&quot;myVariable&quot;))
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    <td valign="top" colspan="2" class="description"><span class="title"></span><pre>&lt;cfif IsDefined(&quot;form.myString&quot;)&gt;
   &lt;p&gt;form.myString ϐ͒`Ă̂ŁA̒g\܂B
   ̂悤ȍ\ɂƁAtH[̃R[hAт̌ʂƂčs̃R[h
   y[WɔzuAIsDefined gpĎst[𐧌ł܂B&lt;/p&gt;
   &lt;p&gt;&quot;form.myString&quot; ̒l &lt;b&gt;&lt;i&gt;
   &lt;cfoutput&gt;#form.myString# łB&lt;/cfoutput&gt;&lt;/i&gt;&lt;/b&gt;
&lt;cfelse&gt;
   &lt;p&gt;̃ev[g߂Ēʉ߂iKł́A&quot;form.myString&quot; Ƃϐ 
   `ł̂ŁA]͍s܂B
&lt;/cfif&gt;

&lt;form action=&quot;#CGI.Script_Name&quot; method=&quot;POST&quot;&gt;
&lt;input type=&quot;Text&quot; name=&quot;MyString&quot; value=&quot;My sample value&quot;&gt;
&lt;input type=&quot;Submit&quot; name=&quot;&quot;&gt;
&lt;/form&gt;
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    <td>pň͂܂ꂽłBeXgϐ̖OłB


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