blocks|key|1096089|text|在这种情况下，不要使用empty()。使用isset()代替它。这也将允许0作为整数。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1096090|$var+=+'0';
if+(!isset($var))+{
++++print+'$var+is+not+set';
}

$var+=+0;
if+(!isset($var))+{
++++print+'$var+is+not+set';
}|code-block|syntax|javascript|1096091|也不应该打印任何东西。|1096092|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

In this case, don't use empty(). Use isset() in place of it. This will also allow 0 as an integer.
<pre><code>$var = '0';
if (!isset($var)) {
 print '$var is not set';
}

$var = 0;
if (!isset($var)) {
 print '$var is not set';
}
</code></pre>
Neither should print anything.

blocks|key|1096263|text|您不能让empty()接受它。这就是它是如何设计的。相反，您可以编写一条and语句来测试：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1096264|if+(empty($var)+&&+$var+!==+'0')+{
++++echo+$var+.+'+is+empty';
}|code-block|syntax|javascript|1096265|当然，您可以使用isset，除非您希望它拒绝empty检查的其他空值。|1096266|entityMap^0|10|3|0|0|8|5|M|5|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|S|8|@$9|T|A|U|B|C]|$9|V|A|W|B|C]]|D|@]|E|$]]|$1|M|3|-4|5|6|7|X|8|@]|D|@]|E|$]]]|N|$]]

You cannot make empty() take it. That is how it was designed. Instead you can write an <code>and</code> statement to test:
<pre><code>if (empty($var) &amp;&amp; $var !== '0') {
 echo $var . ' is empty';
}
</code></pre>
You could use <code>isset</code>, unless of course, you want it to turn away the other empties that <code>empty</code> checks for.

blocks|key|1096397|text|在这两种情况下，empty()都将返回true。检查the+documentation。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1096398|我建议使用不同的函数来匹配您的规范。|1096399|entityMap|0|LINK|mutability|MUTABLE|url|http://php.net/empty^0|8|7|J|4|Q|H|0|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@$9|Q|A|R|B|C]|$9|S|A|T|B|C]]|D|@$9|U|A|V|1|W]]|E|$]]|$1|F|3|G|5|6|7|X|8|@]|D|@]|E|$]]|$1|H|3|-4|5|6|7|Y|8|@]|D|@]|E|$]]]|I|$J|$5|K|L|M|E|$N|O]]]]

In both of your cases <code>empty()</code> will return <code>true</code>. Check <a href="http://php.net/empty" rel="nofollow noreferrer">the documentation</a>.
I suggest using a different function to match your specification.

blocks|key|881538|text|$var+=+'0';

//+Evaluates+to+true+because+$var+is+empty
if+(empty($var)+&&+$var+!==+'0')+{
++++echo+'$var+is+empty+or+the+string+"0"';
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|881539|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>$var = '0';

// Evaluates to true because $var is empty
if (empty($var) &amp;&amp; $var !== '0') {
 echo '$var is empty or the string "0"';
}
</code></pre>

blocks|key|881658|text|我总是在我的代码库中添加以下内容：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|881659|function+is_blank($value)+{
++++return+empty($value)+&&+!is_numeric($value);
}|code-block|syntax|javascript|881660|并使用它而不是空()。它解决了保持零(整型、浮点型或字符串)为非空的问题。|881661|请参阅2011年5月添加的is_blank()。|offset|length|881662|entityMap|0|LINK|mutability|MUTABLE|url|http://www.php.net/manual/en/function.empty.php#103756^0|0|0|0|D|A|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|W|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|X|8|@]|9|@$K|Y|L|Z|1|10]]|A|$]]|$1|M|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|T]]]]

I always add this to my codebase:
<pre><code>function is_blank($value) {
 return empty($value) &amp;&amp; !is_numeric($value);
}
</code></pre>
And use it instead of empty(). It solves the issue of keeping zeros (int, float or string) as non-empty.
See <a href="http://www.php.net/manual/en/function.empty.php#103756" rel="nofollow noreferrer">is_blank()</a> which was added May 2011.

blocks|key|1096636|text|您不能这样做，因为整数、字符串、浮点数和null对于PHP来说都不重要。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1096637|因为它很酷:)|1096638|您必须检查变量的特征特性：is_numeric()、isset()、===、strlen()等。|offset|length|1096639|例如：|1096640|if+(strlen(@$var)==0)+{
++++echo+@$var+.+'+is+empty';
}|code-block|syntax|javascript|1096641|或|1096642|if+(@$var===""+%7C%7C+!isset($var))+{
++++echo+@$var+.+'+is+empty';
}|1096643|或其他示例:)|1096644|entityMap|0|LINK|mutability|MUTABLE|url|https://www.php.net/manual/en/function.is-numeric.php|1|https://www.php.net/manual/en/function.isset.php|2|https://www.php.net/manual/en/function.strlen.php^0|0|0|D|C|0|Q|7|1|12|8|2|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|16|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|17|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|18|8|@]|9|@$F|19|G|1A|1|1B]|$F|1C|G|1D|1|1E]|$F|1F|G|1G|1|1H]]|A|$]]|$1|H|3|I|5|6|7|1I|8|@]|9|@]|A|$]]|$1|J|3|K|5|L|7|1J|8|@]|9|@]|A|$M|N]]|$1|O|3|P|5|6|7|1K|8|@]|9|@]|A|$]]|$1|Q|3|R|5|L|7|1L|8|@]|9|@]|A|$M|N]]|$1|S|3|T|5|6|7|1M|8|@]|9|@]|A|$]]|$1|U|3|-4|5|6|7|1N|8|@]|9|@]|A|$]]]|V|$W|$5|X|Y|Z|A|$10|11]]|12|$5|X|Y|Z|A|$10|13]]|14|$5|X|Y|Z|A|$10|15]]]]

You can not, because integer, string, float, and null do not matter for PHP.
Because it is cool :)
You must check characteristic features for your variable: <a href="https://www.php.net/manual/en/function.is-numeric.php" rel="nofollow noreferrer">is_numeric()</a>, <a href="https://www.php.net/manual/en/function.isset.php" rel="nofollow noreferrer">isset()</a>, ===, <a href="https://www.php.net/manual/en/function.strlen.php" rel="nofollow noreferrer">strlen()</a>, etc.
For example:
<pre><code>if (strlen(@$var)==0) {
 echo @$var . ' is empty';
}
</code></pre>
or
<pre><code>if (@$var===&quot;&quot; || !isset($var)) {
 echo @$var . ' is empty';
}
</code></pre>
or other examples :)

blocks|key|1096687|text|如果您想跳过空的$filter，并且不想跳过$filter+=+'0‘和其他值：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1096688|$filter+=+'';+//+Or+$filter+=+'0';+or+$filter+=+'1';

//+Trim+the+$filter

if(isset($filter)+and+($filter+!=+''+or+$filter+==+'0'))+{

++++//+$filter+data

};|code-block|syntax|javascript|1096689|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|$]]

If you want skip an empty $filter and don’t skip $filter = '0' and other values:
<pre><code>$filter = ''; // Or $filter = '0'; or $filter = '1';

// Trim the $filter

if(isset($filter) and ($filter != '' or $filter == '0')) {

 // $filter data

};
</code></pre>

I want a 0 to be considered as an integer and a '0' to be considered as a string, but empty() considers the '0' as a string in the example below,
<pre><code>$var = '0';

// Evaluates to true because $var is empty
if (empty($var)) {
 echo '$var is empty';
}
</code></pre>
How can I 'make' empty() to take '0's as strings?

'0' as a string with empty() in PHP

我希望将0视为整数，将'0‘视为字符串，但在下面的示例中，empty()将'0’视为字符串。$var = '0';// Evaluates to true because $var is emptyif (empty($var)) {    echo '$var is empty';}我如何'make‘empty()来...

问“0”在PHP中作为带有空()的字符串
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