blocks|key|1142991|text|这很简单，真的。您有一系列的mutator+methods，它们都返回原始(或其他)对象。这样，您就可以继续在返回的对象上调用方法。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1142992|<?php
class+fakeString
{
++++private+$str;
++++function+__construct()
++++{
++++++++$this->str+=+"";
++++}
++++
++++function+addA()
++++{
++++++++$this->str+.=+"a";
++++++++return+$this;
++++}
++++
++++function+addB()
++++{
++++++++$this->str+.=+"b";
++++++++return+$this;
++++}
++++
++++function+getStr()
++++{
++++++++return+$this->str;
++++}
}


$a+=+new+fakeString();


echo+$a->addA()->addB()->getStr();|code-block|syntax|javascript|1142993|这将输出"ab“|1142994|Try+it+online!|1142995|entityMap|0|LINK|mutability|MUTABLE|url|https://en.wikipedia.org/wiki/Mutator_method|1|https://tio.run/##lZBBDoIwEEX3PUVDuoAFXgDF6BU8ABlLgUZTmnbQhfHsOLSSYIwa/6KTzO/7kxnb2XG9tfTKM3jPGzipAzptWnZjnGSdvgAqLjy6InSawUjUveFVJXtD7UFimgUrIpMEdtrnJbl8w5Mkknf2GgB1vftGrgiFJzvJKRyciT8@Ju5/JR7/SmwV0j3eMpdgiJ5p4pkAWtqo6@KaaVaQoWTXcwF5GTcPdT/VeUoxjg8^0|E|F|0|0|0|0|0|E|1|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@$A|X|B|Y|1|Z]]|C|$]]|$1|D|3|E|5|F|7|10|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|11|8|@]|9|@]|C|$]]|$1|K|3|L|5|6|7|12|8|@]|9|@$A|13|B|14|1|15]]|C|$]]|$1|M|3|-4|5|6|7|16|8|@]|9|@]|C|$]]]|N|$O|$5|P|Q|R|C|$S|T]]|U|$5|P|Q|R|C|$S|V]]]]

It's rather simple, really. You have a series of <a href="https://en.wikipedia.org/wiki/Mutator_method" rel="noreferrer">mutator methods</a> that all return the original (or other) object. That way, you can keep calling methods on the returned object.
<pre><code>&lt;?php
class fakeString
{
 private $str;
 function __construct()
 {
 $this-&gt;str = &quot;&quot;;
 }
 
 function addA()
 {
 $this-&gt;str .= &quot;a&quot;;
 return $this;
 }
 
 function addB()
 {
 $this-&gt;str .= &quot;b&quot;;
 return $this;
 }
 
 function getStr()
 {
 return $this-&gt;str;
 }
}


$a = new fakeString();


echo $a-&gt;addA()-&gt;addB()-&gt;getStr();
</code></pre>
This outputs &quot;ab&quot;
<a href="https://tio.run/##lZBBDoIwEEX3PUVDuoAFXgDF6BU8ABlLgUZTmnbQhfHsOLSSYIwa/6KTzO/7kxnb2XG9tfTKM3jPGzipAzptWnZjnGSdvgAqLjy6InSawUjUveFVJXtD7UFimgUrIpMEdtrnJbl8w5Mkknf2GgB1vftGrgiFJzvJKRyciT8@Ju5/JR7/SmwV0j3eMpdgiJ5p4pkAWtqo6@KaaVaQoWTXcwF5GTcPdT/VeUoxjg8" rel="noreferrer" title="PHP – Try It Online">Try it online!</a>

blocks|key|928537|text|方法链接意味着您可以链接方法调用：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|928538|$object->method1()->method2()->method3()|code-block|syntax|javascript|928539|这意味着method1()需要返回一个对象，而method2()则返回method1()的结果。然后，Method2()将返回值传递给method3()。|928540|好文章：http://www.talkphp.com/advanced-php-programming/1163-php5-method-chaining.html|offset|length|928541|entityMap|0|LINK|mutability|MUTABLE|url|http://www.talkphp.com/advanced-php-programming/1163-php5-method-chaining.html^0|0|0|0|4|26|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]]]]

Method chaining means that you can chain method calls:

<pre><code>$object-&gt;method1()-&gt;method2()-&gt;method3()
</code></pre>

This means that method1() needs to return an object, and method2() is given the result of method1(). Method2() then passes the return value to method3().

Good article: <a href="http://www.talkphp.com/advanced-php-programming/1163-php5-method-chaining.html" rel="noreferrer">http://www.talkphp.com/advanced-php-programming/1163-php5-method-chaining.html</a>

blocks|key|1143061|text|有49行代码可以让你像这样在数组上链接方法：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1143062|$fruits+=+new+Arr(array("lemon",+"orange",+"banana",+"apple"));
$fruits->change_key_case(CASE_UPPER)->filter()->walk(function($value,$key)+{
+++++echo+$key.':+'.$value."\r\n";
});|code-block|syntax|javascript|1143063|请参阅这篇文章，它向您展示了如何链接PHP70个array_函数。|1143064|http://domexception.blogspot.fi/2013/08/php-magic-methods-and-arrayobject.html|offset|length|1143065|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|0|0|26|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]]]]

There are 49 lines of code which allows you to chain methods over arrays like this:

<pre><code>$fruits = new Arr(array("lemon", "orange", "banana", "apple"));
$fruits-&gt;change_key_case(CASE_UPPER)-&gt;filter()-&gt;walk(function($value,$key) {
 echo $key.': '.$value."\r\n";
});
</code></pre>

See this article which shows you how to chain all the PHP's seventy array_ functions.

<a href="http://domexception.blogspot.fi/2013/08/php-magic-methods-and-arrayobject.html" rel="nofollow noreferrer">http://domexception.blogspot.fi/2013/08/php-magic-methods-and-arrayobject.html</a>

blocks|key|1143083|text|尝试以下代码：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1143084|<?php
class+DBManager
{
++++private+$selectables+=+array();
++++private+$table;
++++private+$whereClause;
++++private+$limit;

++++public+function+select()+{
++++++++$this->selectables+=+func_get_args();
++++++++return+$this;
++++}

++++public+function+from($table)+{
++++++++$this->table+=+$table;
++++++++return+$this;
++++}

++++public+function+where($where)+{
++++++++$this->whereClause+=+$where;
++++++++return+$this;
++++}

++++public+function+limit($limit)+{
++++++++$this->limit+=+$limit;
++++++++return+$this;
++++}

++++public+function+result()+{
++++++++$query[]+=+"SELECT";
++++++++//+if+the+selectables+array+is+empty,+select+all
++++++++if+(empty($this->selectables))+{
++++++++++++$query[]+=+"*";++
++++++++}
++++++++//+else+select+according+to+selectables
++++++++else+{
++++++++++++$query[]+=+join(',+',+$this->selectables);
++++++++}

++++++++$query[]+=+"FROM";
++++++++$query[]+=+$this->table;

++++++++if+(!empty($this->whereClause))+{
++++++++++++$query[]+=+"WHERE";
++++++++++++$query[]+=+$this->whereClause;
++++++++}

++++++++if+(!empty($this->limit))+{
++++++++++++$query[]+=+"LIMIT";
++++++++++++$query[]+=+$this->limit;
++++++++}

++++++++return+join('+',+$query);
++++}
}

//+Now+to+use+the+class+and+see+how+METHOD+CHAINING+works
//+let+us+instantiate+the+class+DBManager
$testOne+=+new+DBManager();
$testOne->select()->from('users');
echo+$testOne->result();
//+OR
echo+$testOne->select()->from('users')->result();
//+both+displays:+'SELECT+*+FROM+users'

$testTwo+=+new+DBManager();
$testTwo->select()->from('posts')->where('id+>+200')->limit(10);
echo+$testTwo->result();
//+this+displays:+'SELECT+*+FROM+posts+WHERE+id+>+200+LIMIT+10'

$testThree+=+new+DBManager();
$testThree->select(
++++'firstname',
++++'email',
++++'country',
++++'city'
)->from('users')->where('id+=+2399');
echo+$testThree->result();
//+this+will+display:
//+'SELECT+firstname,+email,+country,+city+FROM+users+WHERE+id+=+2399'

?>|code-block|syntax|javascript|1143085|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 code:

<pre><code>&lt;?php
class DBManager
{
 private $selectables = array();
 private $table;
 private $whereClause;
 private $limit;

 public function select() {
 $this-&gt;selectables = func_get_args();
 return $this;
 }

 public function from($table) {
 $this-&gt;table = $table;
 return $this;
 }

 public function where($where) {
 $this-&gt;whereClause = $where;
 return $this;
 }

 public function limit($limit) {
 $this-&gt;limit = $limit;
 return $this;
 }

 public function result() {
 $query[] = "SELECT";
 // if the selectables array is empty, select all
 if (empty($this-&gt;selectables)) {
 $query[] = "*"; 
 }
 // else select according to selectables
 else {
 $query[] = join(', ', $this-&gt;selectables);
 }

 $query[] = "FROM";
 $query[] = $this-&gt;table;

 if (!empty($this-&gt;whereClause)) {
 $query[] = "WHERE";
 $query[] = $this-&gt;whereClause;
 }

 if (!empty($this-&gt;limit)) {
 $query[] = "LIMIT";
 $query[] = $this-&gt;limit;
 }

 return join(' ', $query);
 }
}

// Now to use the class and see how METHOD CHAINING works
// let us instantiate the class DBManager
$testOne = new DBManager();
$testOne-&gt;select()-&gt;from('users');
echo $testOne-&gt;result();
// OR
echo $testOne-&gt;select()-&gt;from('users')-&gt;result();
// both displays: 'SELECT * FROM users'

$testTwo = new DBManager();
$testTwo-&gt;select()-&gt;from('posts')-&gt;where('id &gt; 200')-&gt;limit(10);
echo $testTwo-&gt;result();
// this displays: 'SELECT * FROM posts WHERE id &gt; 200 LIMIT 10'

$testThree = new DBManager();
$testThree-&gt;select(
 'firstname',
 'email',
 'country',
 'city'
)-&gt;from('users')-&gt;where('id = 2399');
echo $testThree-&gt;result();
// this will display:
// 'SELECT firstname, email, country, city FROM users WHERE id = 2399'

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

blocks|key|1143112|text|下面是我的模型，能够通过ID在数据库中找到。with($data)方法是我的附加关系参数，所以我返回$this，它就是对象本身。在我的控制器上，我可以链接它。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1143113|class+JobModel+implements+JobInterface{

++++++++protected+$job;

++++++++public+function+__construct(Model+$job){
++++++++++++$this->job+=+$job;
++++++++}

++++++++public+function+find($id){
++++++++++++return+$this->job->find($id);
++++++++}

++++++++public+function+with($data=[]){
++++++++++++$this->job+=+$this->job->with($params);
++++++++++++return+$this;
++++++++}
}

class+JobController{
++++protected+$job;

++++public+function+__construct(JobModel+$job){
++++++++$this->job+=+$job;
++++}

++++public+function+index(){
++++++++//+chaining+must+be+in+order
++++++++$this->job->with(['data'])->find(1);
++++}
}|code-block|syntax|javascript|1143114|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|$]]

Below is my model that is able to find by ID in the database. The with($data) method is my additional parameters for relationship so I return the $this which is the object itself. On my controller I am able to chain it.

<pre><code>class JobModel implements JobInterface{

 protected $job;

 public function __construct(Model $job){
 $this-&gt;job = $job;
 }

 public function find($id){
 return $this-&gt;job-&gt;find($id);
 }

 public function with($data=[]){
 $this-&gt;job = $this-&gt;job-&gt;with($params);
 return $this;
 }
}

class JobController{
 protected $job;

 public function __construct(JobModel $job){
 $this-&gt;job = $job;
 }

 public function index(){
 // chaining must be in order
 $this-&gt;job-&gt;with(['data'])-&gt;find(1);
 }
}
</code></pre>

blocks|key|1143126|text|静态方法链接的另一种方式：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1143127|class+Maker+
{
++++private+static+$result++++++=+null;
++++private+static+$delimiter+++=+'.';
++++private+static+$data++++++++=+[];

++++public+static+function+words($words)
++++{
++++++++if(+!empty($words)+&&+count($words)+)
++++++++{
++++++++++++foreach+($words+as+$w)
++++++++++++{
++++++++++++++++self::$data[]+=+$w;
++++++++++++}
++++++++}++++++++
++++++++return+new+static;
++++}

++++public+static+function+concate($delimiter)
++++{
++++++++self::$delimiter+=+$delimiter;
++++++++foreach+(self::$data+as+$d)
++++++++{
++++++++++++self::$result+.=+$d.$delimiter;
++++++++}
++++++++return+new+static;
++++}

++++public+static+function+get()
++++{
++++++++return+rtrim(self::$result,+self::$delimiter);
++++}++++
}|code-block|syntax|javascript|1143128|呼叫|1143129|echo+Maker::words(['foo',+'bob',+'bar'])->concate('-')->get();

echo+"<br+/>";

echo+Maker::words(['foo',+'bob',+'bar'])->concate('>')->get();|1143130|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|$]]

<h1>Another Way for static method chaining :</h1>

<pre><code>class Maker 
{
 private static $result = null;
 private static $delimiter = '.';
 private static $data = [];

 public static function words($words)
 {
 if( !empty($words) &amp;&amp; count($words) )
 {
 foreach ($words as $w)
 {
 self::$data[] = $w;
 }
 } 
 return new static;
 }

 public static function concate($delimiter)
 {
 self::$delimiter = $delimiter;
 foreach (self::$data as $d)
 {
 self::$result .= $d.$delimiter;
 }
 return new static;
 }

 public static function get()
 {
 return rtrim(self::$result, self::$delimiter);
 } 
}
</code></pre>

<h2>Calling</h2>

<pre><code>echo Maker::words(['foo', 'bob', 'bar'])-&gt;concate('-')-&gt;get();

echo "&lt;br /&gt;";

echo Maker::words(['foo', 'bob', 'bar'])-&gt;concate('&gt;')-&gt;get();
</code></pre>

blocks|key|1143164|text|如果你指的是像JavaScript+(或者有些人记住jQuery)那样的方法链接，为什么不直接使用一个可以带来开发人员的库呢？有PHP的经验吗？例如，Extras+-+https://dsheiko.github.io/extras/使用JavaScript和下划线方法扩展了PHP类型，并提供链接：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1143165|您可以链接一个特定的类型：|1143166|<?php
use+\Dsheiko\Extras\Arrays;
//+Chain+of+calls
$res+=+Arrays::chain([1,+2,+3])
++++->map(function($num){+return+$num+%2B+1;+})
++++->filter(function($num){+return+$num+>+1;+})
++++->reduce(function($carry,+$num){+return+$carry+%2B+$num;+},+0)
++++->value();|code-block|syntax|javascript|1143167|或|1143168|<?php
use+\Dsheiko\Extras\Strings;
$res+=+Strings::from(+"+12345+"+)
++++++++++++->replace("/1/",+"5")
++++++++++++->replace("/2/",+"5")
++++++++++++->trim()
++++++++++++->substr(1,+3)
++++++++++++->get();
echo+$res;+//+"534"|1143169|或者，您也可以使用多态：|1143170|<?php
use+\Dsheiko\Extras\Any;

$res+=+Any::chain(new+\ArrayObject([1,2,3]))
++++->toArray()+//+value+is+[1,2,3]
++++->map(function($num){+return+[+"num"+=>+$num+];+})
++++//+value+is+[[+"num"+=>+1,+..]]
++++->reduce(function($carry,+$arr){
++++++++$carry+.=+$arr["num"];
++++++++return+$carry;

++++},+"")+//+value+is+"123"
++++->replace("/2/",+"")+//+value+is+"13"
++++->then(function($value){
++++++if+(empty($value))+{
++++++++throw+new+\Exception("Empty+value");
++++++}
++++++return+$value;
++++})
++++->value();
echo+$res;+//+"13"|1143171|entityMap|0|LINK|mutability|MUTABLE|url|https://dsheiko.github.io/extras/^0|2C|X|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@$A|11|B|12|1|13]]|C|$]]|$1|D|3|E|5|6|7|14|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|15|8|@]|9|@]|C|$I|J]]|$1|K|3|L|5|6|7|16|8|@]|9|@]|C|$]]|$1|M|3|N|5|H|7|17|8|@]|9|@]|C|$I|J]]|$1|O|3|P|5|6|7|18|8|@]|9|@]|C|$]]|$1|Q|3|R|5|H|7|19|8|@]|9|@]|C|$I|J]]|$1|S|3|-4|5|6|7|1A|8|@]|9|@]|C|$]]]|T|$U|$5|V|W|X|C|$Y|Z]]]]

If you mean method chaining like in JavaScript (or some people keep in mind jQuery), why not just take a library that brings that dev. experience in PHP? For example Extras - <a href="https://dsheiko.github.io/extras/" rel="nofollow noreferrer">https://dsheiko.github.io/extras/</a> This one extends PHP types with JavaScript and Underscore methods and provides chaining:

You can chain a particular type:

<pre><code>&lt;?php
use \Dsheiko\Extras\Arrays;
// Chain of calls
$res = Arrays::chain([1, 2, 3])
 -&gt;map(function($num){ return $num + 1; })
 -&gt;filter(function($num){ return $num &gt; 1; })
 -&gt;reduce(function($carry, $num){ return $carry + $num; }, 0)
 -&gt;value();
</code></pre>

or

<pre><code>&lt;?php
use \Dsheiko\Extras\Strings;
$res = Strings::from( " 12345 " )
 -&gt;replace("/1/", "5")
 -&gt;replace("/2/", "5")
 -&gt;trim()
 -&gt;substr(1, 3)
 -&gt;get();
echo $res; // "534"
</code></pre>

Alternatively you can go polymorphic:

<pre><code>&lt;?php
use \Dsheiko\Extras\Any;

$res = Any::chain(new \ArrayObject([1,2,3]))
 -&gt;toArray() // value is [1,2,3]
 -&gt;map(function($num){ return [ "num" =&gt; $num ]; })
 // value is [[ "num" =&gt; 1, ..]]
 -&gt;reduce(function($carry, $arr){
 $carry .= $arr["num"];
 return $carry;

 }, "") // value is "123"
 -&gt;replace("/2/", "") // value is "13"
 -&gt;then(function($value){
 if (empty($value)) {
 throw new \Exception("Empty value");
 }
 return $value;
 })
 -&gt;value();
echo $res; // "13"
</code></pre>

blocks|key|1143204|text|我认为这是最相关的答案。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1143205|<?php

class+Calculator
{
++protected+$result+=+0;

++public+function+sum($num)
++{
++++$this->result+%2B=+$num;
++++return+$this;
++}

++public+function+sub($num)
++{
++++$this->result+-=+$num;
++++return+$this;
++}

++public+function+result()
++{
++++return+$this->result;
++}
}

$calculator+=+new+Calculator;
echo+$calculator->sum(10)->sub(5)->sum(3)->result();+//+8|code-block|syntax|javascript|1143206|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 think this is the most relevant answer.
<pre><code>&lt;?php

class Calculator
{
 protected $result = 0;

 public function sum($num)
 {
 $this-&gt;result += $num;
 return $this;
 }

 public function sub($num)
 {
 $this-&gt;result -= $num;
 return $this;
 }

 public function result()
 {
 return $this-&gt;result;
 }
}

$calculator = new Calculator;
echo $calculator-&gt;sum(10)-&gt;sub(5)-&gt;sum(3)-&gt;result(); // 8
</code></pre>

blocks|key|1143240|text|fluent接口允许您链接方法调用，这导致在同一对象上应用多个操作时类型较少的字符。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1143241|class+Bill+{+

++++public+$dinner++++=+20;

++++public+$desserts++=+5;

++++public+$bill;

++++public+function+dinner(+$person+)+{
++++++++$this->bill+%2B=+$this->dinner+*+$person;
++++++++return+$this;
++++}
++++public+function+dessert(+$person+)+{
++++++++$this->bill+%2B=+$this->desserts+*+$person;
++++++++return+$this;
++++}
}

$bill+=+new+Bill();

echo+$bill->dinner(+2+)->dessert(+3+)->bill;|code-block|syntax|javascript|1143242|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|$]]

A fluent interface allows you to chain method calls, which results in less typed characters when applying multiple operations on the same object.
<pre><code>class Bill { 

 public $dinner = 20;

 public $desserts = 5;

 public $bill;

 public function dinner( $person ) {
 $this-&gt;bill += $this-&gt;dinner * $person;
 return $this;
 }
 public function dessert( $person ) {
 $this-&gt;bill += $this-&gt;desserts * $person;
 return $this;
 }
}

$bill = new Bill();

echo $bill-&gt;dinner( 2 )-&gt;dessert( 3 )-&gt;bill;
</code></pre>

I am using PHP 5 and I've heard of a new featured in the object-oriented approach, called 'method chaining'. What is it exactly? How do I implement it?

PHP method chaining or fluent interface?

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我使用的是PHP5，我听说了面向对象方法中的一个新特性，叫做“方法链接”。它到底是什么？我该如何实现它？

问PHP方法链接还是流畅的接口？
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