如何在 PHP 中不使用 foreach 用键和值内爆数组
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How to implode array with key and value without foreach in PHP
提问by tom91136
Without foreach, how can I turn an array like this
没有 foreach，我怎么能像这样转动一个数组
array("item1"=>"object1", "item2"=>"object2",......."item-n"=>"object-n");
to a string like this
像这样的字符串
item1='object1', item2='object2',.... item-n='object-n'
I thought about implode()already, but it doesn't implode the key with it.
我implode()已经想到了，但它并没有用它来破坏钥匙。
If foreach it necessary, is it possible to not nest the foreach?
如果需要foreach，是否可以不嵌套foreach？
EDIT:I've changed the string
编辑：我已经改变了字符串
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.
EDIT2/UPDATE：这个问题是很久以前被问到的。那时，我想将所有内容都写在一行中，因此我会使用三元运算符并嵌套内置函数调用以支持 foreach。这不是一个好习惯！编写可读的代码，无论是否简洁都没有那么重要。
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!).
在这种情况下：将 foreach 放在函数中将比编写单行代码更具可读性和模块化（即使所有答案都很棒！）。
回答by stewe
You could use http_build_query, like this:
您可以使用http_build_query，如下所示：
<?php
$a=array("item1"=>"object1", "item2"=>"object2");
echo http_build_query($a,'',', ');
?>
Output:
输出：
item1=object1, item2=object2
回答by Yoshi
and another way:
和另一种方式：
$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)
));
or:
或者：
$output = implode(', ', array_map(
function ($v, $k) { return sprintf("%s='%s'", $k, $v); },
$input,
array_keys($input)
));
回答by Maxim Tkach
I spent measurements (100000 iterations), what fastest way to glue an associative array?
我进行了测量（100000 次迭代），粘合关联数组的最快方法是什么？
Objective:To obtain a line of 1,000 items, in this format: "key:value,key2:value2"
目标：获取一行 1,000 项，格式如下：“key:value,key2:value2”
We have array (for example):
我们有数组（例如）：
$array = [
'test0' => 344,
'test1' => 235,
'test2' => 876,
...
];
Test number one:
测试一：
Use http_build_queryand str_replace:
使用http_build_query和str_replace：
str_replace('=', ':', http_build_query($array, null, ','));
Average time to implode 1000 elements: 0.00012930955084904
内爆 1000 个元素的平均时间：0.00012930955084904
Test number two:
测试二：
Use array_mapand implode:
使用array_map和内爆：
implode(',', array_map(
function ($v, $k) {
return $k.':'.$v;
},
$array,
array_keys($array)
));
Average time to implode 1000 elements: 0.0004890081976675
内爆 1000 个元素的平均时间：0.0004890081976675
Test number three:
测试三：
Use array_walkand implode:
使用array_walk和内爆：
array_walk($array,
function (&$v, $k) {
$v = $k.':'.$v;
}
);
implode(',', $array);
Average time to implode 1000 elements: 0.0003874126245348
内爆 1000 个元素的平均时间：0.0003874126245348
Test number four:
测试四：
Use foreach:
使用foreach：
$str = '';
foreach($array as $key=>$item) {
$str .= $key.':'.$item.',';
}
rtrim($str, ',');
Average time to implode 1000 elements: 0.00026632803902445
内爆 1000 个元素的平均时间：0.00026632803902445
I can conclude that the best way to glue the array - use http_build_query and str_replace
我可以得出结论，粘合数组的最佳方法 - 使用 http_build_query 和 str_replace
回答by Madara's Ghost
I would use serialize()or json_encode().
我会使用serialize()或json_encode()。
While it won't give your the exact result string you want, it would be much easier to encode/store/retrieve/decode later on.
虽然它不会给你你想要的确切结果字符串，但以后编码/存储/检索/解码会容易得多。
回答by Shiplu Mokaddim
Using array_walk
$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(', ', $r);
回答by Sergey Yurich
For debugging purposes. Recursive write an array of nested arrays to a string. Used foreach. Function stores National Language characters.
用于调试目的。递归将嵌套数组的数组写入字符串。使用foreach。函数存储国家语言字符。
function q($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("%s=\"%s\"", $k, var_export($v, true));
}
return $result;
};
return implode($glue, array_map($function, $input, array_keys($input))) . "\n";
}
回答by Bj?rn
Change
改变
- return substr($result, (-1 * strlen($glue)));
+ return substr($result, 0, -1 * strlen($glue));
if you want to resive the entire String without the last $glue
如果你想在没有最后一个 $glue 的情况下恢复整个字符串
function key_implode(&$array, $glue) {
$result = "";
foreach ($array as $key => $value) {
$result .= $key . "=" . $value . $glue;
}
return substr($result, (-1 * strlen($glue)));
}
And the usage:
以及用法：
$str = key_implode($yourArray, ",");
回答by nickl-
There is also var_exportand print_rmore commonly known for printing debug output but both functions can take an optional argument to return a string instead.
还有var_export和print_r更常用于打印调试输出，但这两个函数都可以采用可选参数来返回字符串。
Using the example from the question as data.
使用问题中的示例作为数据。
$array = ["item1"=>"object1", "item2"=>"object2","item-n"=>"object-n"];
Using print_rto turn the array into a string
使用print_r把所述阵列成一个字符串
This will output a human readable representation of the variable.
这将输出变量的人类可读表示。
$string = print_r($array, true);
echo $string;
Will output:
将输出：
Array
(
[item1] => object1
[item2] => object2
[item-n] => object-n
)
Using var_exportto turn the array into a string
使用var_export把所述阵列成一个字符串
Which will output a php string representation of the variable.
这将输出变量的 php 字符串表示。
$string = var_export($array, true);
echo $string;
Will output:
将输出：
array (
'item1' => 'object1',
'item2' => 'object2',
'item-n' => 'object-n',
)
Because it is valid php we can evaluate it.
因为它是有效的 php 我们可以评估它。
eval('$array2 = ' . var_export($array, true) . ';');
var_dump($array2 === $array);
Outputs:
输出：
bool(true)
回答by sapenov
You could use PHP's array_reduceas well,
你也可以使用 PHP 的array_reduce，
$a = ['Name' => 'Last Name'];
function acc($acc,$k)use($a){ return $acc .= $k.":".$a[$k].",";}
$imploded = array_reduce(array_keys($a), "acc");
回答by Ajay Patidar
For create mysql where conditions from array
用于创建 mysql where 数组中的条件
$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("'%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'))
