blocks|key|1365342|text|这是这个的简写：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1365343|<?php+echo+$a;+?>|code-block|syntax|javascript|1365344|它们被称为短标记；参见documentation中的示例#1。|offset|length|1365345|entityMap|0|LINK|mutability|MUTABLE|url|https://www.php.net/manual/en/language.basic-syntax.phptags.php^0|0|0|B|D|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@$I|V|J|W|1|X]]|A|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

It's a shorthand for this:
<pre><code>&lt;?php echo $a; ?&gt;
</code></pre>
They're called short tags; see example #1 in the <a href="https://www.php.net/manual/en/language.basic-syntax.phptags.php" rel="nofollow noreferrer">documentation</a>.

blocks|key|1150305|text|这是<?php+echo+$a;+?>的缩写。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1150306|无论php.ini设置如何，它都是默认启用的since+5.4.0。|1150307|entityMap|0|LINK|mutability|MUTABLE|url|https://www.php.net/ChangeLog-5.php#5.4.0^0|2|H|0|2|7|M|B|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]]]]

It's a shorthand for <code>&lt;?php echo $a; ?&gt;</code>.
It's enabled by default <a href="https://www.php.net/ChangeLog-5.php#5.4.0" rel="nofollow noreferrer">since 5.4.0</a> regardless of <code>php.ini</code> settings.

blocks|key|1150320|text|<?=$a;+?>|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1150321|是以下各项的快捷方式：|unstyled|1150322|<?php+echo+$a;+?>|1150323|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|L|8|@]|9|@]|A|$]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$B|C]]|$1|I|3|-4|5|F|7|N|8|@]|9|@]|A|$]]]|J|$]]

<pre><code>&lt;?=$a; ?&gt;
</code></pre>

is a shortcut for:

<pre><code>&lt;?php echo $a; ?&gt;
</code></pre>

blocks|key|1150344|text|<?=+$a+?>与<?+echo+$a;+?>相同，只是为了方便起见而进行了简化。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1150345|entityMap^0|0|9|A|E|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|M|8|@]|D|@]|E|$]]]|G|$]]

<code>&lt;?= $a ?&gt;</code> is the same as <code>&lt;? echo $a; ?&gt;</code>, just shorthand for convenience.

blocks|key|1365482|text|如果启用了short_open_tags，则这是<?php+echo+$a;+?>的快捷方式。参考：http://php.net/manual/en/ini.core.php|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1365483|entityMap|0|LINK|mutability|MUTABLE|url|http://php.net/manual/en/ini.core.php^0|5|E|O|H|1E|11|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@$9|O|A|P|B|C]|$9|Q|A|R|B|C]]|D|@$9|S|A|T|1|U]]|E|$]]|$1|F|3|-4|5|6|7|V|8|@]|D|@]|E|$]]]|G|$H|$5|I|J|K|E|$L|M]]]]

It's a shortcut for <code>&lt;?php echo $a; ?&gt;</code> if <code>short_open_tag</code>s are enabled. Ref: <a href="http://php.net/manual/en/ini.core.php" rel="noreferrer">http://php.net/manual/en/ini.core.php</a>

blocks|key|1365516|text|因为它不会增加任何价值，重复它意味着echo，我想你会想看看在PHP中到底是什么意思：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1365517|Array
(
++++[0]+=>+Array
++++++++(
++++++++++++[0]+=>+368+//+T_OPEN_TAG_WITH_ECHO
++++++++++++[1]+=>+<?=
++++++++++++[2]+=>+1
++++++++)
++++[1]+=>+Array
++++++++(
++++++++++++[0]+=>+309+//+T_VARIABLE
++++++++++++[1]+=>+$a
++++++++++++[2]+=>+1
++++++++)
++++[2]+=>+;+//+UNKNOWN+(because+it+is+optional+(ignored))
++++[3]+=>+Array
++++++++(
++++++++++++[0]+=>+369+//+T_CLOSE_TAG
++++++++++++[1]+=>+?>
++++++++++++[2]+=>+1
++++++++)
)|code-block|syntax|javascript|1365518|您可以使用此代码自己测试它：|1365519|$tokens+=+token_get_all('<?=$a;?>');
print_r($tokens);
foreach($tokens+as+$token){
++++echo+token_name((int)+$token[0]),+PHP_EOL;
}|1365520|来自List+of+Parser+Tokens的here+is+what+T_OPEN_TAG_WITH_ECHO+links+to。|1365521|entityMap|0|LINK|mutability|MUTABLE|url|http://www.php.net/manual/en/tokens.php|1|http://www.php.net/manual/en/language.basic-syntax.phpmode.php^0|I|4|0|0|0|0|2|L|0|O|16|1|0^^$0|@$1|2|3|4|5|6|7|10|8|@$9|11|A|12|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|13|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|14|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|15|8|@]|D|@]|E|$I|J]]|$1|O|3|P|5|6|7|16|8|@]|D|@$9|17|A|18|1|19]|$9|1A|A|1B|1|1C]]|E|$]]|$1|Q|3|-4|5|6|7|1D|8|@]|D|@]|E|$]]]|R|$S|$5|T|U|V|E|$W|X]]|Y|$5|T|U|V|E|$W|Z]]]]

Since it wouldn't add any value to repeat that it means <code>echo</code>, I thought you'd like to see what means in PHP exactly:

<pre><code>Array
(
 [0] =&gt; Array
 (
 [0] =&gt; 368 // T_OPEN_TAG_WITH_ECHO
 [1] =&gt; &lt;?=
 [2] =&gt; 1
 )
 [1] =&gt; Array
 (
 [0] =&gt; 309 // T_VARIABLE
 [1] =&gt; $a
 [2] =&gt; 1
 )
 [2] =&gt; ; // UNKNOWN (because it is optional (ignored))
 [3] =&gt; Array
 (
 [0] =&gt; 369 // T_CLOSE_TAG
 [1] =&gt; ?&gt;
 [2] =&gt; 1
 )
)
</code></pre>

You can use this code to test it yourself:

<pre><code>$tokens = token_get_all('&lt;?=$a;?&gt;');
print_r($tokens);
foreach($tokens as $token){
 echo token_name((int) $token[0]), PHP_EOL;
}
</code></pre>

From the <a href="http://www.php.net/manual/en/tokens.php" rel="noreferrer">List of Parser Tokens</a>, <a href="http://www.php.net/manual/en/language.basic-syntax.phpmode.php" rel="noreferrer">here is what T_OPEN_TAG_WITH_ECHO links to</a>.

blocks|key|1150466|text|从PHP5.4.0开始，即使没有在php.ini中设置short_open_tag，<?=+++?>也始终可用。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1150467|此外，从PHP7.0开始，<%25,+%25>和脚本标记<script+language="php">从PHP7.0中删除。|1150468|entityMap^0|16|8|0|D|6|O|N|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|H|3|-4|5|6|7|R|8|@]|D|@]|E|$]]]|I|$]]

As of PHP 5.4.0, 
 <code>&lt;?= ?&gt;</code>
are always available even without the short_open_tag set in php.ini.

Furthermore, as of PHP 7.0, The ASP tags:
 <code>&lt;%, %&gt;</code> 
and the script tag 
 <code>&lt;script language="php"&gt;</code> 
are removed from PHP.

<pre><code>&lt;?php

$a=1;

?&gt;
&lt;?=$a;?&gt;
</code></pre>

What does <code>&lt;?=</code> mean exactly?

What does '<?=' mean in PHP?

<?php$a=1;?><?=$a;?><?=到底是什么意思？

问在PHP中'<?=‘是什么意思？
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