blocks|key|251079|text|对于常规检查是否存在POST操作，请使用：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|251080|if+(!empty($_POST))|code-block|syntax|javascript|251081|编辑：如评论中所述，此方法在某些情况下不起作用(例如，使用复选框和没有名称的按钮)。你真的应该使用：|BOLD|251082|if+($_SERVER['REQUEST_METHOD']+==+'POST')|251083|entityMap^0|A|4|0|0|0|2|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@$9|S|A|T|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|U|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|V|8|@$9|W|A|X|B|M]]|D|@]|E|$]]|$1|N|3|O|5|H|7|Y|8|@]|D|@]|E|$I|J]]|$1|P|3|-4|5|6|7|Z|8|@]|D|@]|E|$]]]|Q|$]]

For general check if there was a <code>POST</code> action use: 

<pre><code>if (!empty($_POST))
</code></pre>

EDIT: As stated in the comments, this method won't work for in some cases (e.g. with check boxes and button without a name). You really should use:

<pre><code>if ($_SERVER['REQUEST_METHOD'] == 'POST')
</code></pre>

blocks|key|254436|text|怎么样|type|unstyled|depth|inlineStyleRanges|entityRanges|data|254437|if($_SERVER['REQUEST_METHOD']+==+'POST')|code-block|syntax|javascript|254438|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

How about 

<pre><code>if($_SERVER['REQUEST_METHOD'] == 'POST')
</code></pre>

blocks|key|3146521|text|实际上，submit按钮已经执行了此功能。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3146522|在表单中尝试：|3146523|<form+method="post">
<input+type="submit"+name="treasure"+value="go!">
</form>|code-block|syntax|javascript|3146524|然后在PHP处理程序中：|3146525|if+(isset($_POST['treasure'])){
echo+"treasure+will+be+set+if+the+form+has+been+submitted+(to+TRUE,+I+believe)";
}|3146526|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Q|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

Actually, the submit button already performs this function.

Try in the FORM:

<pre><code>&lt;form method="post"&gt;
&lt;input type="submit" name="treasure" value="go!"&gt;
&lt;/form&gt;
</code></pre>

Then in the PHP handler:

<pre><code>if (isset($_POST['treasure'])){
echo "treasure will be set if the form has been submitted (to TRUE, I believe)";
}
</code></pre>

blocks|key|254443|text|使用|type|unstyled|depth|inlineStyleRanges|entityRanges|data|254444|if(isset($_POST['submit']))+//+name+of+your+submit+button|code-block|syntax|javascript|254445|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Use

<pre><code>if(isset($_POST['submit'])) // name of your submit button
</code></pre>

blocks|key|2931795|text|if+($_SERVER['REQUEST_METHOD']+==+'POST')。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2931796|entityMap^0|0|15|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

<code>if ($_SERVER['REQUEST_METHOD'] == 'POST')</code>.

blocks|key|253015|text|尝尝这个|type|unstyled|depth|inlineStyleRanges|entityRanges|data|253016|+<form+action=""+method="POST"+id="formaddtask">
++++++Add+Task:+<input+type="text"name="newtaskname"+/>
++++++<input+type="submit"+value="Submit"/>
+</form>

++++//Check+if+the+form+is+submitted
++++if($_SERVER['REQUEST_METHOD']+==+'POST'+&&+!empty($_POST['newtaskname'])){

++++}|code-block|syntax|javascript|253017|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Try this 

<pre><code> &lt;form action="" method="POST" id="formaddtask"&gt;
 Add Task: &lt;input type="text"name="newtaskname" /&gt;
 &lt;input type="submit" value="Submit"/&gt;
 &lt;/form&gt;

 //Check if the form is submitted
 if($_SERVER['REQUEST_METHOD'] == 'POST' &amp;&amp; !empty($_POST['newtaskname'])){

 }
</code></pre>

blocks|key|249490|text|另一方面，将令牌添加到表单并验证它，以检查数据是否不是从外部发送的，这也是一种良好的实践。以下是步骤：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|249491|249492|生成唯一令牌(您可以使用散列)例如：|ordered-list-item|249493|249494|$token+=+hash+(string+$algo，string+$data，bool+$raw_output+=+FALSE+)；|249495|将此内标识分配给会话变量。例如：|unordered-list-item|249496|249497|$_SESSION‘’form_+token‘=$token；|249498|添加隐藏输入以提交令牌。例如：|249499|249500|作为验证的一部分，检查提交的value="{$token}"|249501|then是否与type=name=匹配。|249502|249503|例如:+if+(+$_POST'token‘===+$_SESSION’‘form_token’)+....|249504|entityMap^0|0|0|0|0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|11|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|12|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|13|8|@]|9|@]|A|$]]|$1|G|3|H|5|6|7|14|8|@]|9|@]|A|$]]|$1|I|3|J|5|K|7|15|8|@]|9|@]|A|$]]|$1|L|3|-4|5|6|7|16|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|17|8|@]|9|@]|A|$]]|$1|O|3|P|5|K|7|18|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|19|8|@]|9|@]|A|$]]|$1|R|3|S|5|6|7|1A|8|@]|9|@]|A|$]]|$1|T|3|U|5|K|7|1B|8|@]|9|@]|A|$]]|$1|V|3|-4|5|6|7|1C|8|@]|9|@]|A|$]]|$1|W|3|X|5|6|7|1D|8|@]|9|@]|A|$]]|$1|Y|3|-4|5|6|7|1E|8|@]|9|@]|A|$]]]|Z|$]]

On a different note, it is also always a good practice to add a token to your form and verify it to check if the data was not sent from outside. Here are the steps:

<ol>
<li>Generate a unique token (you can use hash) Ex: 

<pre><code>$token = hash (string $algo , string $data [, bool $raw_output = FALSE ] );
</code></pre></li>
<li>Assign this token to a session variable. Ex: 

<pre><code>$_SESSION['form_token'] = $token;
</code></pre></li>
<li>Add a hidden input to submit the token. Ex: 

<pre><code>input type="hidden" name="token" value="{$token}"
</code></pre></li>
<li>then as part of your validation, check if the submitted token
matches the session var. 

<pre><code>Ex: if ( $_POST['token'] === $_SESSION['form_token'] ) ....
</code></pre></li>
</ol>

blocks|key|2931846|text|我也遇到了同样的问题--还要确保在输入按钮中添加了name=""。好吧，这个解决办法对我很有效。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2931847|if($_SERVER['REQUEST_METHOD']+==+'POST'+&&+!empty($_POST['add'])){
++++echo+"stuff+is+happening+now";
}

<input+type="submit"+name="add"+value="Submit">|code-block|syntax|javascript|2931848|entityMap^0|P|7|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

I had the same problem - also make sure you add <code>name=""</code> in the input button. Well, that fix worked for me. 

<pre><code>if($_SERVER['REQUEST_METHOD'] == 'POST' &amp;&amp; !empty($_POST['add'])){
 echo "stuff is happening now";
}

&lt;input type="submit" name="add" value="Submit"&gt;
</code></pre>

blocks|key|253006|text|您还可以使用：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|253007|is_array($_POST)|code-block|syntax|javascript|253008|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You could also use:

<pre><code>is_array($_POST)
</code></pre>

What is the best way of checking whether or not a form has been submitted to determine whether I should pass the form's variables to my validation class?

First I thought maybe:

<pre><code>isset($_POST)
</code></pre>

But that will always return true as a superglobal is defined everywhere. I don't want to have to iterate through each element of my form with:

<pre><code>if(isset($_POST['element1']) || isset($_POST['element2']) || isset(...etc
</code></pre>

Whilst writing this question I thought of a much more basic solution, add a hidden field to act as a flag that I can check.

Is there a 'cleaner' way to do it than adding my own flag?

Checking if form has been submitted - PHP

检查表单是否已提交以确定是否应该将表单的变量传递给验证类的最佳方法是什么？一开始我想也许：isset($_POST)但这将始终返回true，因为超级全局的定义无处不在。我不想遍历表单中的每个元素：if(isset($_POST['element1']) || isset($_POST['element2']) || isset(...etc在写这个问题的时候，我想到了一个更基本的解决方案，添加一个

问检查表单是否已提交- PHP
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