blocks|key|1349754|text|http://ideone.com/DSfppl|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1349755|我想array_search()是你要找的。array_search+-搜索数组中给定的值，如果成功返回相应的键。我认为这与你在最初的问题(+a)和(+b)中试图达到的目标是一致的。|style|CODE|1349756|$array+=+[1,+2,+3,+4,+5,+6,+7,+8,+9];

//finds+if+the+value+exist+and+returns+key
$key+=+array_search(8,+$array);+

//return+key
echo+$key;++//returns+7|code-block|syntax|javascript|1349757|性能：|1349758|数组搜索为O(n)。|1349759|entityMap|0|LINK|mutability|MUTABLE|url^0|0|O|0|0|2|E|0|0|0|0^^$0|@$1|2|3|4|5|6|7|X|8|@]|9|@$A|Y|B|Z|1|10]]|C|$]]|$1|D|3|E|5|6|7|11|8|@$A|12|B|13|F|G]]|9|@]|C|$]]|$1|H|3|I|5|J|7|14|8|@]|9|@]|C|$K|L]]|$1|M|3|N|5|6|7|15|8|@]|9|@]|C|$]]|$1|O|3|P|5|6|7|16|8|@]|9|@]|C|$]]|$1|Q|3|-4|5|6|7|17|8|@]|9|@]|C|$]]]|R|$S|$5|T|U|V|C|$W|4]]]]

<h2><a href="http://ideone.com/DSfppl" rel="nofollow">http://ideone.com/DSfppl</a></h2>

I think an <code>array_search()</code> is what you're looking for. array_search — Searches the array for a given value and returns the corresponding key if successful. I think this resonates with what you are trying to achieve in your original question a) and b).

<pre><code>$array = [1, 2, 3, 4, 5, 6, 7, 8, 9];

//finds if the value exist and returns key
$key = array_search(8, $array); 

//return key
echo $key; //returns 7
</code></pre>

Performance:

Array search is O(n).

blocks|key|1349789|text|你的意思是：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1349790|$arr+=+[1,+2,+3,+4,+5,+6,+7,+8,+9];
$findValue+=+8;

$result+=+array_filter(
++++$arr,+
++++function+($arrValue)+use($findValue)+{
++++++++return+($arrValue+%25+$findValue)+==+0;
++++}
);|code-block|syntax|javascript|1349791|编辑|offset|length|style|BOLD|1349792|也许你的意思更像是：|1349793|$arr+=+[1,+2,+3,+4,+5,+6,+7,+8,+9];
$findValue+=+3;

foreach(array_filter(
++++$arr,+
++++function+($arrValue)+use($findValue)+{
++++++++return+($arrValue+%25+$findValue)+==+0;
++++}
)+as+$key+=>+$value)+{
++++echo+$value,+'+is+a+multiple+of+',+$findValue,+PHP_EOL;
}|1349794|编辑#2|1349795|或者你指的是更复杂的东西，比如：|1349796|function+filter($values,+$function)+{
++++return+array_filter(
++++++++$values,
++++++++$function
++++);
}

$isEven+=+function+($value)+{
++++return+!($value+&+1);
};

$isOdd+=+function+($value)+{
++++return+$value+&+1;
};

$data+=+range(1,10);

echo+'array_filter()+for+Odds',+PHP_EOL;
var_dump(
++++filter(
++++++++$data,
++++++++$isOdd
++++)
);

echo+'array_filter()+for+Evens',+PHP_EOL;
var_dump(
++++filter(
++++++++$data,
++++++++$isEven
++++)
);|1349797|也可以使用PHP5.5生成器：|1349798|$isEven+=+function+($value)+{
++++return+!($value+&+1);
};

$isOdd+=+function+($value)+{
++++return+$value+&+1;
};

function+xFilter(callable+$callback,+$args=array())+{
++++foreach($args+as+$arg)+{
++++++++if+(call_user_func($callback,+$arg))+{
++++++++++++yield+$arg;
++++++++}
++++}
}

echo+'xFilter+for+Odds',+PHP_EOL;
foreach(xFilter($isOdd,+range(1,10))+as+$i)+{
++++echo('num+is:+'.$i.PHP_EOL);
}

echo+'xFilter+for+Evens',+PHP_EOL;
foreach(xFilter($isEven,+range(1,10))+as+$i)+{
++++echo('num+is:+'.$i.PHP_EOL);
}|1349799|entityMap^0|0|0|0|2|0|0|0|0|4|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|12|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|13|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|14|8|@$I|15|J|16|K|L]]|9|@]|A|$]]|$1|M|3|N|5|6|7|17|8|@]|9|@]|A|$]]|$1|O|3|P|5|D|7|18|8|@]|9|@]|A|$E|F]]|$1|Q|3|R|5|6|7|19|8|@$I|1A|J|1B|K|L]]|9|@]|A|$]]|$1|S|3|T|5|6|7|1C|8|@]|9|@]|A|$]]|$1|U|3|V|5|D|7|1D|8|@]|9|@]|A|$E|F]]|$1|W|3|X|5|6|7|1E|8|@]|9|@]|A|$]]|$1|Y|3|Z|5|D|7|1F|8|@]|9|@]|A|$E|F]]|$1|10|3|-4|5|6|7|1G|8|@]|9|@]|A|$]]]|11|$]]

You mean something like:

<pre><code>$arr = [1, 2, 3, 4, 5, 6, 7, 8, 9];
$findValue = 8;

$result = array_filter(
 $arr, 
 function ($arrValue) use($findValue) {
 return ($arrValue % $findValue) == 0;
 }
);
</code></pre>

EDIT

Perhaps you mean something more like:

<pre><code>$arr = [1, 2, 3, 4, 5, 6, 7, 8, 9];
$findValue = 3;

foreach(array_filter(
 $arr, 
 function ($arrValue) use($findValue) {
 return ($arrValue % $findValue) == 0;
 }
) as $key =&gt; $value) {
 echo $value, ' is a multiple of ', $findValue, PHP_EOL;
}
</code></pre>

EDIT #2

Or do you mean something a lot more sophisticated like:

<pre><code>function filter($values, $function) {
 return array_filter(
 $values,
 $function
 );
}

$isEven = function ($value) {
 return !($value &amp; 1);
};

$isOdd = function ($value) {
 return $value &amp; 1;
};

$data = range(1,10);

echo 'array_filter() for Odds', PHP_EOL;
var_dump(
 filter(
 $data,
 $isOdd
 )
);

echo 'array_filter() for Evens', PHP_EOL;
var_dump(
 filter(
 $data,
 $isEven
 )
);
</code></pre>

or using PHP 5.5 Generators as well:

<pre><code>$isEven = function ($value) {
 return !($value &amp; 1);
};

$isOdd = function ($value) {
 return $value &amp; 1;
};

function xFilter(callable $callback, $args=array()) {
 foreach($args as $arg) {
 if (call_user_func($callback, $arg)) {
 yield $arg;
 }
 }
}

echo 'xFilter for Odds', PHP_EOL;
foreach(xFilter($isOdd, range(1,10)) as $i) {
 echo('num is: '.$i.PHP_EOL);
}

echo 'xFilter for Evens', PHP_EOL;
foreach(xFilter($isEven, range(1,10)) as $i) {
 echo('num is: '.$i.PHP_EOL);
}
</code></pre>

This is probably hopeless but still, is there a way to search for elements in an array with my own comparator function? Implementing it in PHP would result in slow searches, so maybe a better solution exists?

What I actually want from the search is a) get to know whether the element is present in the array and b) preferably, get the key (index) of the found element.

For example

<pre><code>$arr = [1, 2, 3, 4, 5, 6, 7, 8, 9];
</code></pre>

and if the comparator would look like this

<pre><code>$comp = function ($arrValue, $findValue) {
 return ($arrValue % $findValue) == 0;
};
</code></pre>

Then the comparator-based search function would return <code>true</code> if <code>8</code> was searched and, which would be nice of it, output the index of the found element, which is <code>7</code>.

Search in PHP array with a custom comparator

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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这可能是没有希望的，但还有什么方法可以用我自己的比较器函数在数组中搜索元素吗？在PHP中实现它会导致缓慢的搜索，所以可能有更好的解决方案吗？我真正想从搜索中得到的是( a)知道元素是否存在于数组中( b)，最好得到查找元素的键(索引)。例如$arr = [1, 2, 3, 4, 5, 6, 7, 8, 9];如果比较器...

问使用自定义比较器在PHP数组中搜索
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