blocks|key|1167652|text|是的，==区分大小写。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1167653|可以使用strcasecmp进行不区分大小写的比较|1167654|entityMap|0|LINK|mutability|MUTABLE|url|https://secure.php.net/manual/en/function.strcasecmp.php^0|3|2|0|4|A|4|A|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@$9|Q|A|R|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|S|8|@$9|T|A|U|B|C]]|D|@$9|V|A|W|1|X]]|E|$]]|$1|H|3|-4|5|6|7|Y|8|@]|D|@]|E|$]]]|I|$J|$5|K|L|M|E|$N|O]]]]

Yes, <code>==</code> is case sensitive.

You can use <a href="https://secure.php.net/manual/en/function.strcasecmp.php" rel="noreferrer"><code>strcasecmp</code></a> for case insensitive comparison

blocks|key|1167711|text|是的，==区分大小写。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1167712|顺便说一下，对于不区分大小写的比较，可以使用strcasecmp|1167713|<?php
++++$var1+=+"Hello";
++++$var2+=+"hello";
++++echo+(strcasecmp($var1,+$var2)+==+0);+//+TRUE;
?>|code-block|syntax|javascript|1167714|entityMap|0|LINK|mutability|MUTABLE|url|https://secure.php.net/manual/en/function.strcasecmp.php^0|3|2|0|M|A|M|A|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|X|8|@$9|Y|A|Z|B|C]]|D|@$9|10|A|11|1|12]]|E|$]]|$1|H|3|I|5|J|7|13|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|14|8|@]|D|@]|E|$]]]|N|$O|$5|P|Q|R|E|$S|T]]]]

Yes, <code>==</code> is case sensitive.

Incidentally, for a non case sensitive compare, use <a href="https://secure.php.net/manual/en/function.strcasecmp.php" rel="nofollow noreferrer"><code>strcasecmp</code></a>:

<pre><code>&lt;?php
 $var1 = "Hello";
 $var2 = "hello";
 echo (strcasecmp($var1, $var2) == 0); // TRUE;
?&gt;
</code></pre>

blocks|key|953576|text|是的，但它会逐字节地进行比较。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|953577|如果您正在比较unicode字符串，您可能希望首先对其进行规范化。请参见Normalizer类。|offset|length|style|CODE|953578|示例(UTF-8格式的输出)：|953579|$s1+=+mb_convert_encoding("\x00\xe9",+"UTF-8",+"UTF-16BE");
$s2+=+mb_convert_encoding("\x00\x65\x03\x01",+"UTF-8",+"UTF-16BE");
//look+the+same:
echo+$s1,+"\n";
echo+$s2,+"\n";
var_dump($s1+==+$s2);+//false
var_dump(Normalizer::normalize($s1)+==+Normalizer::normalize($s2));+//true|code-block|syntax|javascript|953580|entityMap|0|LINK|mutability|MUTABLE|url|https://secure.php.net/normalizer^0|0|10|A|10|A|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|X|8|@$D|Y|E|Z|F|G]]|9|@$D|10|E|11|1|12]]|A|$]]|$1|H|3|I|5|6|7|13|8|@]|9|@]|A|$]]|$1|J|3|K|5|L|7|14|8|@]|9|@]|A|$M|N]]|$1|O|3|-4|5|6|7|15|8|@]|9|@]|A|$]]]|P|$Q|$5|R|S|T|A|$U|V]]]]

Yes, but it does a comparison byte-by-byte.

If you're comparing unicode strings, you may wish to normalize them first. See the <a href="https://secure.php.net/normalizer" rel="nofollow noreferrer"><code>Normalizer</code></a> class.

Example (output in UTF-8):

<pre><code>$s1 = mb_convert_encoding("\x00\xe9", "UTF-8", "UTF-16BE");
$s2 = mb_convert_encoding("\x00\x65\x03\x01", "UTF-8", "UTF-16BE");
//look the same:
echo $s1, "\n";
echo $s2, "\n";
var_dump($s1 == $s2); //false
var_dump(Normalizer::normalize($s1) == Normalizer::normalize($s2)); //true
</code></pre>

blocks|key|953636|text|==是区分大小写的，可以通过php手册中的其他一些操作数来熟悉。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|953637|http://www.php.net/manual/en/language.operators.comparison.php|953638|entityMap|0|LINK|mutability|MUTABLE|url^0|0|2|0|0|1Q|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|R|8|@]|D|@$9|S|A|T|1|U]]|E|$]]|$1|H|3|-4|5|6|7|V|8|@]|D|@]|E|$]]]|I|$J|$5|K|L|M|E|$N|G]]]]

<code>==</code> is case sensitive, some other operands from the php manual to familiarize yourself with

<a href="http://www.php.net/manual/en/language.operators.comparison.php" rel="nofollow noreferrer">http://www.php.net/manual/en/language.operators.comparison.php</a>

blocks|key|953651|text|是的，==区分大小写。对我来说，最简单的方法是转换为大写，然后进行比较。在实例中：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|953652|$var+=+"Hello";
if(strtoupper($var)+==+"HELLO")+{
++++echo+"identical";
}
else+{
++++echo+"non+identical";
}|code-block|syntax|javascript|953653|我希望它能起作用！|953654|entityMap^0|3|2|0|0|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]]|$1|K|3|L|5|6|7|S|8|@]|D|@]|E|$]]|$1|M|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|N|$]]

Yes, <code>==</code> is case sensitive. The easiest way for me is to convert to uppercase and then compare. In instance:

<pre><code>$var = "Hello";
if(strtoupper($var) == "HELLO") {
 echo "identical";
}
else {
 echo "non identical";
}
</code></pre>

I hope it works!

blocks|key|953705|text|您可以尝试使用哈希函数进行比较|type|unstyled|depth|inlineStyleRanges|entityRanges|data|953706|++if(+md5('string1')+==+md5('string2')+)+{
++++//+strings+are+equal
++}else+{
++++//+strings+are+not+equal
++}|code-block|syntax|javascript|953707|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 try comparing with a hash function instead

<pre><code> if( md5('string1') == md5('string2') ) {
 // strings are equal
 }else {
 // strings are not equal
 }
</code></pre>

I was unable to find this on php.net. Is the double equal sign (<code>==</code>) case sensitive when used to compare strings in PHP?

Is == in PHP a case-sensitive string comparison?

哈希函数

PHP语言

我在php.net上找不到这个。在PHP语言中比较字符串时，双等号(==)是否区分大小写？

问PHP中的==是区分大小写的字符串比较吗？
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