blocks|key|221601|text|我会使用serialize()或json_encode()。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|221602|虽然它不会给出您想要的确切结果字符串，但稍后编码/存储/检索/解码会容易得多。|221603|entityMap^0|4|B|G|D|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]|$9|M|A|N|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|O|8|@]|D|@]|E|$]]|$1|H|3|-4|5|6|7|P|8|@]|D|@]|E|$]]]|I|$]]

I would use <code>serialize()</code> or <code>json_encode()</code>.

While it won't give your the exact result string you want, it would be much easier to encode/store/retrieve/decode later on.

blocks|key|2871585|text|变化|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2871586|-++++return+substr($result,+(-1+*+strlen($glue)));
%2B++++return+substr($result,+0,+-1+*+strlen($glue));|code-block|syntax|javascript|2871587|如果您想返回整个字符串而不返回最后一个$glue|2871588|function+key_implode(&$array,+$glue)+{
++++$result+=+"";
++++foreach+($array+as+$key+=>+$value)+{
++++++++$result+.=+$key+.+"="+.+$value+.+$glue;
++++}
++++return+substr($result,+(-1+*+strlen($glue)));
}|2871589|和用法：|2871590|$str+=+key_implode($yourArray,+",");|2871591|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|U|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

Change 

<pre><code>- return substr($result, (-1 * strlen($glue)));
+ return substr($result, 0, -1 * strlen($glue));
</code></pre>

if you want to resive the entire String without the last $glue

<pre><code>function key_implode(&amp;$array, $glue) {
 $result = "";
 foreach ($array as $key =&gt; $value) {
 $result .= $key . "=" . $value . $glue;
 }
 return substr($result, (-1 * strlen($glue)));
}
</code></pre>

And the usage:

<pre><code>$str = key_implode($yourArray, ",");
</code></pre>

blocks|key|218581|text|您可以使用http_build_query，如下所示：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|218582|<?php
++$a=array("item1"=>"object1",+"item2"=>"object2");
++echo+http_build_query($a,'',',+');
?>|code-block|syntax|javascript|218583|输出：|218584|item1=object1,+item2=object2+|218585|Demo|218586|entityMap|0|LINK|mutability|MUTABLE|url|http://php.net/http_build_query|1|http://codepad.viper-7.com/vfKClP^0|5|G|0|0|0|0|0|0|4|1|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@$A|Z|B|10|1|11]]|C|$]]|$1|D|3|E|5|F|7|12|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|13|8|@]|9|@]|C|$]]|$1|K|3|L|5|F|7|14|8|@]|9|@]|C|$G|H]]|$1|M|3|N|5|6|7|15|8|@]|9|@$A|16|B|17|1|18]]|C|$]]|$1|O|3|-4|5|6|7|19|8|@]|9|@]|C|$]]]|P|$Q|$5|R|S|T|C|$U|V]]|W|$5|R|S|T|C|$U|X]]]]

You could use <a href="http://php.net/http_build_query">http_build_query</a>, like this:

<pre><code>&lt;?php
 $a=array("item1"=&gt;"object1", "item2"=&gt;"object2");
 echo http_build_query($a,'',', ');
?&gt;
</code></pre>

Output:

<pre><code>item1=object1, item2=object2 
</code></pre>

<a href="http://codepad.viper-7.com/vfKClP">Demo</a>

blocks|key|223559|text|还有另一种方式：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|223560|$input+=+array(
++++'item1'++=>+'object1',
++++'item2'++=>+'object2',
++++'item-n'+=>+'object-n'
);

$output+=+implode(',+',+array_map(
++++function+($v,+$k)+{
++++++++if(is_array($v)){
++++++++++++return+$k.'[]='.implode('&'.$k.'[]=',+$v);
++++++++}else{
++++++++++++return+$k.'='.$v;
++++++++}
++++},+
++++$input,+
++++array_keys($input)
));|code-block|syntax|javascript|223561|或者：|223562|$output+=+implode(',+',+array_map(
++++function+($v,+$k)+{+return+sprintf("%25s='%25s'",+$k,+$v);+},
++++$input,
++++array_keys($input)
));|223563|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|$]]

and another way:

<pre><code>$input = array(
 'item1' =&gt; 'object1',
 'item2' =&gt; 'object2',
 'item-n' =&gt; 'object-n'
);

$output = implode(', ', array_map(
 function ($v, $k) {
 if(is_array($v)){
 return $k.'[]='.implode('&amp;'.$k.'[]=', $v);
 }else{
 return $k.'='.$v;
 }
 }, 
 $input, 
 array_keys($input)
));
</code></pre>

or:

<pre><code>$output = implode(', ', array_map(
 function ($v, $k) { return sprintf("%s='%s'", $k, $v); },
 $input,
 array_keys($input)
));
</code></pre>

blocks|key|2871639|text|使用array_walk|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2871640|$a+=+array("item1"=>"object1",+"item2"=>"object2","item-n"=>"object-n");
$r=array();
array_walk($a,+create_function('$b,+$c',+'global+$r;+$r[]="$c=$b";'));
echo+implode(',+',+$r);|code-block|syntax|javascript|2871641|IDEONE|2871642|entityMap|0|LINK|mutability|MUTABLE|url|http://php.net/array_walk|1|http://ideone.com/W9Sdv^0|2|A|0|0|0|0|6|1|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@$A|V|B|W|1|X]]|C|$]]|$1|D|3|E|5|F|7|Y|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|Z|8|@]|9|@$A|10|B|11|1|12]]|C|$]]|$1|K|3|-4|5|6|7|13|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]|S|$5|N|O|P|C|$Q|T]]]]

Using <a href="http://php.net/array_walk" rel="nofollow">array_walk</a>

<pre><code>$a = array("item1"=&gt;"object1", "item2"=&gt;"object2","item-n"=&gt;"object-n");
$r=array();
array_walk($a, create_function('$b, $c', 'global $r; $r[]="$c=$b";'));
echo implode(', ', $r);
</code></pre>

<a href="http://ideone.com/W9Sdv" rel="nofollow">IDEONE</a>

blocks|key|2871660|text|用于调试目的。递归地将嵌套数组的数组写入字符串。使用foreach。函数存储国家语言字符。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2871661|function+q($input)
{
++++$glue+=+',+';
++++$function+=+function+($v,+$k)+use+(&$function,+$glue)+{
++++++++if+(is_array($v))+{
++++++++++++$arr+=+[];
++++++++++++foreach+($v+as+$key+=>+$value)+{
++++++++++++++++$arr[]+=+$function($value,+$key);
++++++++++++}
++++++++++++$result+=+"{"+.+implode($glue,+$arr)+.+"}";
++++++++}+else+{
++++++++++++$result+=+sprintf("%25s=\"%25s\"",+$k,+var_export($v,+true));
++++++++}
++++++++return+$result;
++++};
++++return+implode($glue,+array_map($function,+$input,+array_keys($input)))+.+"\n";
}|code-block|syntax|javascript|2871662|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|$]]

For debugging purposes. Recursive write an array of nested arrays to a string.
Used foreach. Function stores National Language characters.

<pre><code>function q($input)
{
 $glue = ', ';
 $function = function ($v, $k) use (&amp;$function, $glue) {
 if (is_array($v)) {
 $arr = [];
 foreach ($v as $key =&gt; $value) {
 $arr[] = $function($value, $key);
 }
 $result = "{" . implode($glue, $arr) . "}";
 } else {
 $result = sprintf("%s=\"%s\"", $k, var_export($v, true));
 }
 return $result;
 };
 return implode($glue, array_map($function, $input, array_keys($input))) . "\n";
}
</code></pre>

blocks|key|3085564|text|我花费了测量(100000次迭代)，粘合关联数组的最快方法是什么？|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3085565|目标：获取一行1,000项，格式为："key:value，key2:value2“|offset|length|style|BOLD|3085566|我们有数组(例如)：|3085567|$array+=+[
++++'test0'+=>+344,
++++'test1'+=>+235,
++++'test2'+=>+876,
++++...
];|code-block|syntax|javascript|3085568|测试一：|3085569|使用http_build_query和str_replace|3085570|str_replace('=',+':',+http_build_query($array,+null,+','));|3085571|内爆1,000个元素的平均时间:+0.00012930955084904|3085572|测试二：|3085573|Use+array_map和implode|3085574|implode(',',+array_map(
++++++++function+($v,+$k)+{
++++++++++++return+$k.':'.$v;
++++++++},
++++++++$array,
++++++++array_keys($array)
++++));|3085575|内爆1,000个元素的平均时间:+0.0004890081976675|3085576|测试三：|3085577|Use+array_walk和implode|3085578|array_walk($array,
++++++++function+(&$v,+$k)+{
++++++++++++$v+=+$k.':'.$v;
++++++++}
++++);
implode(',',+$array);|3085579|内爆1,000个元素的平均时间:+0.0003874126245348|3085580|测试四：|3085581|使用foreach|3085582|++++$str+=+'';
++++foreach($array+as+$key=>$item)+{
++++++++$str+.=+$key.':'.$item.',';
++++}
++++rtrim($str,+',');|3085583|内爆1,000个元素的平均时间:+0.00026632803902445|3085584|我可以得出结论，将阵列结合在一起的最佳方法是使用http_build_query和str_replace|3085585|entityMap^0|0|0|3|0|0|0|0|4|0|2|G|J|B|0|0|0|0|4|0|4|9|E|7|0|0|0|0|4|0|4|A|F|7|0|0|0|0|4|0|2|7|0|0|0|0^^$0|@$1|2|3|4|5|6|7|1O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|1P|8|@$D|1Q|E|1R|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|1S|8|@]|9|@]|A|$]]|$1|J|3|K|5|L|7|1T|8|@]|9|@]|A|$M|N]]|$1|O|3|P|5|6|7|1U|8|@$D|1V|E|1W|F|G]]|9|@]|A|$]]|$1|Q|3|R|5|6|7|1X|8|@$D|1Y|E|1Z|F|G]|$D|20|E|21|F|G]]|9|@]|A|$]]|$1|S|3|T|5|L|7|22|8|@]|9|@]|A|$M|N]]|$1|U|3|V|5|6|7|23|8|@]|9|@]|A|$]]|$1|W|3|X|5|6|7|24|8|@$D|25|E|26|F|G]]|9|@]|A|$]]|$1|Y|3|Z|5|6|7|27|8|@$D|28|E|29|F|G]|$D|2A|E|2B|F|G]]|9|@]|A|$]]|$1|10|3|11|5|L|7|2C|8|@]|9|@]|A|$M|N]]|$1|12|3|13|5|6|7|2D|8|@]|9|@]|A|$]]|$1|14|3|15|5|6|7|2E|8|@$D|2F|E|2G|F|G]]|9|@]|A|$]]|$1|16|3|17|5|6|7|2H|8|@$D|2I|E|2J|F|G]|$D|2K|E|2L|F|G]]|9|@]|A|$]]|$1|18|3|19|5|L|7|2M|8|@]|9|@]|A|$M|N]]|$1|1A|3|1B|5|6|7|2N|8|@]|9|@]|A|$]]|$1|1C|3|1D|5|6|7|2O|8|@$D|2P|E|2Q|F|G]]|9|@]|A|$]]|$1|1E|3|1F|5|6|7|2R|8|@$D|2S|E|2T|F|G]]|9|@]|A|$]]|$1|1G|3|1H|5|L|7|2U|8|@]|9|@]|A|$M|N]]|$1|1I|3|1J|5|6|7|2V|8|@]|9|@]|A|$]]|$1|1K|3|1L|5|6|7|2W|8|@]|9|@]|A|$]]|$1|1M|3|-4|5|6|7|2X|8|@]|9|@]|A|$]]]|1N|$]]

I spent measurements (100000 iterations), what fastest way to glue an associative array?

Objective: To obtain a line of 1,000 items, in this format: "key:value,key2:value2"

We have array (for example):

<pre><code>$array = [
 'test0' =&gt; 344,
 'test1' =&gt; 235,
 'test2' =&gt; 876,
 ...
];
</code></pre>

Test number one:

Use http_build_query and str_replace:

<pre><code>str_replace('=', ':', http_build_query($array, null, ','));
</code></pre>

Average time to implode 1000 elements: 0.00012930955084904

Test number two:

Use array_map and implode:

<pre><code>implode(',', array_map(
 function ($v, $k) {
 return $k.':'.$v;
 },
 $array,
 array_keys($array)
 ));
</code></pre>

Average time to implode 1000 elements: 0.0004890081976675

Test number three:

Use array_walk and implode:

<pre><code>array_walk($array,
 function (&amp;$v, $k) {
 $v = $k.':'.$v;
 }
 );
implode(',', $array);
</code></pre>

Average time to implode 1000 elements: 0.0003874126245348

Test number four:

Use foreach:

<pre><code> $str = '';
 foreach($array as $key=&gt;$item) {
 $str .= $key.':'.$item.',';
 }
 rtrim($str, ',');
</code></pre>

Average time to implode 1000 elements: 0.00026632803902445

I can conclude that the best way to glue the array - use http_build_query and str_replace

blocks|key|3085611|text|你也可以使用PHP的array_reduce，|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3085612|$a+=+['Name'+=>+'Last+Name'];

function+acc($acc,$k)use($a){+return+$acc+.=+$k.":".$a[$k].",";}

$imploded+=+array_reduce(array_keys($a),+"acc");|code-block|syntax|javascript|3085613|entityMap|0|LINK|mutability|MUTABLE|url|http://php.net/manual/en/function.array-reduce.php^0|A|C|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

You could use PHP's <a href="http://php.net/manual/en/function.array-reduce.php" rel="nofollow noreferrer">array_reduce</a> as well,

<pre><code>$a = ['Name' =&gt; 'Last Name'];

function acc($acc,$k)use($a){ return $acc .= $k.":".$a[$k].",";}

$imploded = array_reduce(array_keys($a), "acc");
</code></pre>

blocks|key|3085671|text|For+create+mysql+where+conditions+from+array|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3085672|$sWheres+=+array('item1'++=>+'object1',
+++++++++++++++++'item2'++=>+'object2',
+++++++++++++++++'item3'++=>+1,
+++++++++++++++++'item4'++=>+array(4,5),
+++++++++++++++++'item5'++=>+array('object3','object4'));
$sWhere+=+'';
if(!empty($sWheres)){
++++$sWhereConditions+=+array();
++++foreach+($sWheres+as+$key+=>+$value){
++++++++if(!empty($value)){
++++++++++++if(is_array($value)){
++++++++++++++++$value+=+array_filter($value);+//+For+remove+blank+values+from+array
++++++++++++++++if(!empty($value)){
++++++++++++++++++++array_walk($value,+function(&$item){+$item+=+sprintf("'%25s'",+$item);+});+//+For+make+value+string+type+'string'
++++++++++++++++++++$sWhereConditions[]+=+sprintf("%25s+in+(%25s)",+$key,+implode(',+',+$value));
++++++++++++++++}
++++++++++++}else{
++++++++++++++++$sWhereConditions[]+=+sprintf("%25s='%25s'",+$key,+$value);
++++++++++++}
++++++++}
++++}
++++if(!empty($sWhereConditions)){
++++++++$sWhere+.=+"(".implode('+AND+',+$sWhereConditions).")";
++++}
}
echo+$sWhere;++//+(item1='object1'+AND+item2='object2'+AND+item3='1'+AND+item4+in+('4',+'5')+AND+item5+in+('object3',+'object4'))|code-block|syntax|javascript|3085673|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|$]]

For create mysql where conditions from array

<pre><code>$sWheres = array('item1' =&gt; 'object1',
 'item2' =&gt; 'object2',
 'item3' =&gt; 1,
 'item4' =&gt; array(4,5),
 'item5' =&gt; array('object3','object4'));
$sWhere = '';
if(!empty($sWheres)){
 $sWhereConditions = array();
 foreach ($sWheres as $key =&gt; $value){
 if(!empty($value)){
 if(is_array($value)){
 $value = array_filter($value); // For remove blank values from array
 if(!empty($value)){
 array_walk($value, function(&amp;$item){ $item = sprintf("'%s'", $item); }); // For make value string type 'string'
 $sWhereConditions[] = sprintf("%s in (%s)", $key, implode(', ', $value));
 }
 }else{
 $sWhereConditions[] = sprintf("%s='%s'", $key, $value);
 }
 }
 }
 if(!empty($sWhereConditions)){
 $sWhere .= "(".implode(' AND ', $sWhereConditions).")";
 }
}
echo $sWhere; // (item1='object1' AND item2='object2' AND item3='1' AND item4 in ('4', '5') AND item5 in ('object3', 'object4'))
</code></pre>

blocks|key|223658|text|下面是一个简单的例子，使用class：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|223659|$input+=+array(
++++'element1'++=>+'value1',
++++'element2'++=>+'value2',
++++'element3'+=>++'value3'
);

echo+FlatData::flatArray($input,',+',+'=');

class+FlatData
{

++++public+static+function+flatArray(array+$input+=+array(),+$separator_elements+=+',+',+$separator+=+':+')
++++{
++++++++$output+=+implode($separator_elements,+array_map(
++++++++++++function+($v,+$k,+$s)+{
++++++++++++++++return+sprintf("%25s{$s}%25s",+$k,+$v);
++++++++++++},
++++++++++++$input,
++++++++++++array_keys($input),
++++++++++++array_fill(0,+count($input),+$separator)
++++++++));
++++++return+$output;
++++}

}|code-block|syntax|javascript|223660|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|$]]

Here is a simple example, using class:

<pre><code>$input = array(
 'element1' =&gt; 'value1',
 'element2' =&gt; 'value2',
 'element3' =&gt; 'value3'
);

echo FlatData::flatArray($input,', ', '=');

class FlatData
{

 public static function flatArray(array $input = array(), $separator_elements = ', ', $separator = ': ')
 {
 $output = implode($separator_elements, array_map(
 function ($v, $k, $s) {
 return sprintf("%s{$s}%s", $k, $v);
 },
 $input,
 array_keys($input),
 array_fill(0, count($input), $separator)
 ));
 return $output;
 }

}
</code></pre>

blocks|key|3085756|text|还有var_export和print_r函数，它们通常用于打印调试输出，但这两个函数都可以使用可选参数返回字符串。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3085757|使用问题中的示例作为数据。|3085758|$array+=+["item1"=>"object1",+"item2"=>"object2","item-n"=>"object-n"];|code-block|syntax|javascript|3085759|使用print_r将数组转换为字符串|style|CODE|3085760|这将输出变量的人类可读表示。|3085761|$string+=+print_r($array,+true);
echo+$string;|3085762|将输出：|3085763|Array
(
++++[item1]+=>+object1
++++[item2]+=>+object2
++++[item-n]+=>+object-n
)|3085764|使用var_export将数组转换为字符串|3085765|它将输出变量的php字符串表示。|3085766|$string+=+var_export($array,+true);
echo+$string;|3085767|3085768|array+(
++'item1'+=>+'object1',
++'item2'+=>+'object2',
++'item-n'+=>+'object-n',
)|3085769|因为它是有效的php，所以我们可以对其进行评估。|3085770|eval('$array2+=+'+.+var_export($array,+true)+.+';');
var_dump($array2+===+$array);|3085771|输出：|3085772|bool(true)|3085773|entityMap|0|LINK|mutability|MUTABLE|url|https://www.php.net/manual/en/function.var-export.php|1|https://www.php.net/manual/en/function.print-r.php^0|2|A|0|D|7|1|0|0|0|2|7|0|0|0|0|0|2|A|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|1N|8|@]|9|@$A|1O|B|1P|1|1Q]|$A|1R|B|1S|1|1T]]|C|$]]|$1|D|3|E|5|6|7|1U|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|1V|8|@]|9|@]|C|$I|J]]|$1|K|3|L|5|6|7|1W|8|@$A|1X|B|1Y|M|N]]|9|@]|C|$]]|$1|O|3|P|5|6|7|1Z|8|@]|9|@]|C|$]]|$1|Q|3|R|5|H|7|20|8|@]|9|@]|C|$I|J]]|$1|S|3|T|5|6|7|21|8|@]|9|@]|C|$]]|$1|U|3|V|5|H|7|22|8|@]|9|@]|C|$I|J]]|$1|W|3|X|5|6|7|23|8|@$A|24|B|25|M|N]]|9|@]|C|$]]|$1|Y|3|Z|5|6|7|26|8|@]|9|@]|C|$]]|$1|10|3|11|5|H|7|27|8|@]|9|@]|C|$I|J]]|$1|12|3|T|5|6|7|28|8|@]|9|@]|C|$]]|$1|13|3|14|5|H|7|29|8|@]|9|@]|C|$I|J]]|$1|15|3|16|5|6|7|2A|8|@]|9|@]|C|$]]|$1|17|3|18|5|H|7|2B|8|@]|9|@]|C|$I|J]]|$1|19|3|1A|5|6|7|2C|8|@]|9|@]|C|$]]|$1|1B|3|1C|5|H|7|2D|8|@]|9|@]|C|$I|J]]|$1|1D|3|-4|5|6|7|2E|8|@]|9|@]|C|$]]]|1E|$1F|$5|1G|1H|1I|C|$1J|1K]]|1L|$5|1G|1H|1I|C|$1J|1M]]]]

There is also <a href="https://www.php.net/manual/en/function.var-export.php" rel="nofollow noreferrer">var_export</a> and <a href="https://www.php.net/manual/en/function.print-r.php" rel="nofollow noreferrer">print_r</a> more commonly known for printing debug output but both functions can take an optional argument to return a string instead.

Using the example from the question as data.

<pre class="lang-php prettyprint-override"><code>$array = ["item1"=&gt;"object1", "item2"=&gt;"object2","item-n"=&gt;"object-n"];
</code></pre>

<h2>Using <code>print_r</code> to turn the array into a string</h2>

This will output a human readable representation of the variable.

<pre class="lang-php prettyprint-override"><code>$string = print_r($array, true);
echo $string;
</code></pre>

Will output:

<pre class="lang-none prettyprint-override"><code>Array
(
 [item1] =&gt; object1
 [item2] =&gt; object2
 [item-n] =&gt; object-n
)
</code></pre>

<h2>Using <code>var_export</code> to turn the array into a string</h2>

Which will output a php string representation of the variable.

<pre class="lang-php prettyprint-override"><code>$string = var_export($array, true);
echo $string;
</code></pre>

Will output:

<pre class="lang-none prettyprint-override"><code>array (
 'item1' =&gt; 'object1',
 'item2' =&gt; 'object2',
 'item-n' =&gt; 'object-n',
)
</code></pre>

Because it is valid php we can evaluate it.

<pre class="lang-php prettyprint-override"><code>eval('$array2 = ' . var_export($array, true) . ';');
var_dump($array2 === $array);
</code></pre>

Outputs:

<pre class="lang-none prettyprint-override"><code>bool(true)
</code></pre>

blocks|key|3085775|text|使用explode从任何字符串中获取数组总是可以的，因为数组是一个始终在标准结构中的数组。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3085776|但是对于数组到字符串，有任何理由在代码中使用预定义的字符串吗？而字符串应该以任何格式使用！|3085777|foreach的优点是您可以在需要的时候创建字符串！我建议仍然使用foreach，安静，可读，干净。|3085778|$list+=+array('a'=>'1',+'b'=>'2',+'c'=>'3');

$sql_val+=+array();
foreach+($list+as+$key+=>+$value)+{
++++$sql_val[]+=+"("+.+$key+.+",+'"+.+$value+.+"')+";
}
$sql_val+=+implode(',+',+$sql_val);|code-block|syntax|javascript|3085779|结果如下：|3085780|(a,+'1')+,+(b,+'2')+,+(c,+'3')+|3085781|%7C|3085782|(a:+'1')+,+(b:+'2')+,+(c:+'3')+|3085783|%7C|3085784|a:'1'+,+b:'2'+,+c:'3'+|3085785|等。|3085786|entityMap^0|0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|11|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|12|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|13|8|@]|9|@]|A|$I|J]]|$1|K|3|L|5|6|7|14|8|@]|9|@]|A|$]]|$1|M|3|N|5|H|7|15|8|@]|9|@]|A|$I|J]]|$1|O|3|P|5|6|7|16|8|@]|9|@]|A|$]]|$1|Q|3|R|5|H|7|17|8|@]|9|@]|A|$I|J]]|$1|S|3|T|5|6|7|18|8|@]|9|@]|A|$]]|$1|U|3|V|5|H|7|19|8|@]|9|@]|A|$I|J]]|$1|W|3|X|5|6|7|1A|8|@]|9|@]|A|$]]|$1|Y|3|-4|5|6|7|1B|8|@]|9|@]|A|$]]]|Z|$]]

Using explode to get an array from any string is always OK, because array is an always in standard structure.
But about array to string, is there any reason to use predefined string in codes? while the string SHOULD be in any format to use!
The good point of foreach is that you can create the string AS YOU NEED IT!
I'd suggest still using foreach quiet readable and clean.
<pre><code>$list = array('a'=&gt;'1', 'b'=&gt;'2', 'c'=&gt;'3');

$sql_val = array();
foreach ($list as $key =&gt; $value) {
 $sql_val[] = &quot;(&quot; . $key . &quot;, '&quot; . $value . &quot;') &quot;;
}
$sql_val = implode(', ', $sql_val);
</code></pre>
with results:
<pre><code>(a, '1') , (b, '2') , (c, '3') 
</code></pre>
|
<pre><code>(a: '1') , (b: '2') , (c: '3') 
</code></pre>
|
<pre><code>a:'1' , b:'2' , c:'3' 
</code></pre>
etc.

Without foreach, 
how can I turn an array like this

<pre><code>array("item1"=&gt;"object1", "item2"=&gt;"object2",......."item-n"=&gt;"object-n");
</code></pre>

to a string like this

<pre><code>item1='object1', item2='object2',.... item-n='object-n'
</code></pre>

I thought about <code>implode()</code> already, but it doesn't implode the key with it.

If foreach it necessary, is it possible to not nest the foreach? 

EDIT: I've changed the string

<hr>

EDIT2/UPDATE: 
This question was asked quite a while ago. At that time, I wanted to write everything in one line so I would use ternary operators and nest built in function calls in favor of foreach. That was not a good practice! Write code that is readable, whether it is concise or not doesn't matter that much.

In this case: putting the foreach in a function will be much more readable and modular than writing a one-liner(Even though all the answers are great!).

How to implode array with key and value without foreach in PHP

如果没有foreach，我怎么能把这样的数组array("item1"=>"object1", "item2"=>"object2",......."item-n"=>"object-n");一个字符串，如下所示item1='object1', item2='object2',.... item-n='object-n...

问PHP中如何在没有foreach情况下内爆带有键和值的数组
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