blocks|key|1160326|text|对于PHP7之前的版本，我能想到的立即执行它们的唯一方法是|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1160327|call_user_func(function()+{+echo+'executed';+});|code-block|syntax|javascript|1160328|使用当前版本的PHP，您只需执行以下操作|1160329|(function()+{+echo+'executed';+})();|1160330|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

For versions prior to PHP 7, the only way to execute them immediately I can think of is
<pre><code>call_user_func(function() { echo 'executed'; });
</code></pre>
With current versions of PHP, you can just do
<pre><code>(function() { echo 'executed'; })();
</code></pre>

blocks|key|1160524|text|是在PHP+7中做同样的事情。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1160525|$gen+=+(function()+{
++++yield+1;
++++yield+2;

++++return+3;
})();

foreach+($gen+as+$val)+{
++++echo+$val,+PHP_EOL;
}

echo+$gen->getReturn(),+PHP_EOL;|code-block|syntax|javascript|1160526|输出为：|1160527|1
2
3|1160528|entityMap^0|2|5|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|U|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|V|8|@]|D|@]|E|$I|J]]|$1|O|3|-4|5|6|7|W|8|@]|D|@]|E|$]]]|P|$]]

In <code>PHP 7</code> is to do the same in javascript

<pre><code>$gen = (function() {
 yield 1;
 yield 2;

 return 3;
})();

foreach ($gen as $val) {
 echo $val, PHP_EOL;
}

echo $gen-&gt;getReturn(), PHP_EOL;
</code></pre>

The output is:

<pre><code>1
2
3
</code></pre>

blocks|key|946463|text|当然，您可以使用call_user_func，但还有另一个非常简单的替代方案：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|946464|<?php
//+we+simply+need+to+write+a+simple+function+called+run:
function+run($f){
++++$f();
}

//+and+then+we+can+use+it+like+this:
run(function(){
++++echo+"do+something";
});

?>|code-block|syntax|javascript|946465|entityMap|0|LINK|mutability|MUTABLE|url|http://php.net/manual/en/function.call-user-func.php^0|8|E|8|E|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]]|D|@$9|V|A|W|1|X]]|E|$]]|$1|F|3|G|5|H|7|Y|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Z|8|@]|D|@]|E|$]]]|L|$M|$5|N|O|P|E|$Q|R]]]]

Well of course you can use <a href="http://php.net/manual/en/function.call-user-func.php" rel="noreferrer"><code>call_user_func</code></a>, but there's still another pretty simple alternative:

<pre><code>&lt;?php
// we simply need to write a simple function called run:
function run($f){
 $f();
}

// and then we can use it like this:
run(function(){
 echo "do something";
});

?&gt;
</code></pre>

blocks|key|946707|text|对于PHP7.0或更高版本，这是最简单的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|946708|(function()+{echo+'Hi';})();|code-block|syntax|javascript|946709|它的意思是创建闭包，然后通过"()“调用它作为函数。由于统一的变量求值顺序，其工作方式与JS类似。|946710|https://3v4l.org/06EL3|offset|length|946711|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|0|0|M|0|0^^$0|@$1|2|3|4|5|6|7|T|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|U|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|V|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|W|8|@]|9|@$K|X|L|Y|1|Z]]|A|$]]|$1|M|3|-4|5|6|7|10|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|J]]]]

This is the simplest for PHP 7.0 or later.
<pre><code>(function() {echo 'Hi';})();
</code></pre>
It means create closure, then call it as function by following &quot;()&quot;. Works just like JS thanks to uniform variable evaluation order.
<a href="https://3v4l.org/06EL3" rel="nofollow noreferrer">https://3v4l.org/06EL3</a>

blocks|key|1160550|text|(new+ReflectionFunction(function()+{
+//+body+function
}))->invoke();|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1160551|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>(new ReflectionFunction(function() {
 // body function
}))-&gt;invoke();
</code></pre>

blocks|key|946785|text|注意，accepted+answer是很好的，但是它花费的时间是声明一个函数并在两行中调用它的1.41倍(慢了41%25)。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|946786|我知道这并不是一个新的答案，但我觉得在某个地方为访问者添加这个答案是有价值的。|946787|详细信息：|946788|<?php
#+Tags:+benchmark,+call_user_func,+anonymous+function+
require_once("Benchmark.php");
bench(array(
++++++++'test1_anonfunc_call'+=>+function(){
++++++++++++++++$f+=+function(){
++++++++++++++++++++++++$x+=+123;
++++++++++++++++};
++++++++++++++++$f();
++++++++},
++++++++'test2_anonfunc_call_user_func'+=>+function(){
++++++++++++++++call_user_func(
++++++++++++++++++++++++function(){
++++++++++++++++++++++++++++++++$x+=+123;
++++++++++++++++++++++++}
++++++++++++++++);
++++++++}
),+10000);
?>|code-block|syntax|javascript|946789|结果：|946790|$+php+test8.php
test1_anonfunc_call+took+0.0081379413604736s+(1228812.0001172/s)
test2_anonfunc_call_user_func+took+0.011472940444946s+(871616.13432805/s)|946791|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/3568663/3727869^0|3|F|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@$A|Z|B|10|1|11]]|C|$]]|$1|D|3|E|5|6|7|12|8|@]|9|@]|C|$]]|$1|F|3|G|5|6|7|13|8|@]|9|@]|C|$]]|$1|H|3|I|5|J|7|14|8|@]|9|@]|C|$K|L]]|$1|M|3|N|5|6|7|15|8|@]|9|@]|C|$]]|$1|O|3|P|5|J|7|16|8|@]|9|@]|C|$K|L]]|$1|Q|3|-4|5|6|7|17|8|@]|9|@]|C|$]]]|R|$S|$5|T|U|V|C|$W|X]]]]

Note, <a href="https://stackoverflow.com/a/3568663/3727869">accepted answer</a> is fine but it takes 1.41x as long (41% slower) than declaring a function and calling it in two lines.

[I know it's not really a new answer but I felt it was valuable to add this somewhere for visitors.]

Details:

<pre><code>&lt;?php
# Tags: benchmark, call_user_func, anonymous function 
require_once("Benchmark.php");
bench(array(
 'test1_anonfunc_call' =&gt; function(){
 $f = function(){
 $x = 123;
 };
 $f();
 },
 'test2_anonfunc_call_user_func' =&gt; function(){
 call_user_func(
 function(){
 $x = 123;
 }
 );
 }
), 10000);
?&gt;
</code></pre>

Results:

<pre><code>$ php test8.php
test1_anonfunc_call took 0.0081379413604736s (1228812.0001172/s)
test2_anonfunc_call_user_func took 0.011472940444946s (871616.13432805/s)
</code></pre>

blocks|key|1160789|text|这不是直接的回答，而是一种变通方法。使用PHP+>=+7.使用命名方法定义一个匿名类，并构造该类并立即调用该方法。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1160790|$var+=+(new+class()+{+//+Anonymous+class
++++function+cool()+{+//+Named+method
++++++++return+'neato';
++++}
})->cool();+//+Instantiate+the+anonymous+class+and+call+the+named+method
echo+$var;+//+Echos+neato+to+console.|code-block|syntax|javascript|1160791|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|$]]

This isn't a direct answer, but a workaround. Using PHP >= 7. Defining an anonymous class with a named method and constructing the class and calling the method right away.

<pre><code>$var = (new class() { // Anonymous class
 function cool() { // Named method
 return 'neato';
 }
})-&gt;cool(); // Instantiate the anonymous class and call the named method
echo $var; // Echos neato to console.
</code></pre>

blocks|key|1160472|text|我尝试过这种方法，但它比使用允许您首先定义函数的任何运算符(或函数)的顶部答案更详细：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1160473|++++$value+=+$hack+==+($hack+=+function(){
++++++++++++//+just+a+hack+way+of+executing+an+anonymous+function
++++++++++++return+array(0,+1,+2,+3);++++++++++++++++
++++})+?+$hack()+:+$hack();|code-block|syntax|javascript|1160474|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|$]]

I tried it out this way, but it's more verbose than the top answer by using any operator (or function) that allows you to define the function first:

<pre><code> $value = $hack == ($hack = function(){
 // just a hack way of executing an anonymous function
 return array(0, 1, 2, 3); 
 }) ? $hack() : $hack();
</code></pre>

blocks|key|1160415|text|不是立即执行，而是接近执行;)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1160416|<?php

$var+=+(function(){+echo+'do+something';+});
$var();

?>|code-block|syntax|javascript|1160417|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|$]]

Not executed inmediately, but close to ;)

<pre><code>&lt;?php

$var = (function(){ echo 'do something'; });
$var();

?&gt;
</code></pre>

In JavaScript, you can define anonymous functions that are executed immediately:

<pre><code>(function () { /* do something */ })()
</code></pre>

Can you do something like that in PHP?

How do I immediately execute an anonymous function in PHP?

在JavaScript中，您可以定义立即执行的匿名函数：(function () { /* do something */ })()你能在PHP中做这样的事情吗？

问如何在PHP中立即执行匿名函数？
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回答 9

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