How to implode array with key and value without foreach in PHP
Without foreach, how can I turn an array like this
array("item1"=>"object1", "item2"=>"object2",......."item-n"=>"object-n");
to a string like this
item1='object1', item2='object2',.... item-n='object-n'
I thought about implode()
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
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!).
You could use http_build_query, like this:
<?php
$a=array("item1"=>"object1", "item2"=>"object2");
echo http_build_query($a,'',', ');
?>
Output:
item1=object1, item2=object2
Demo
and another way:
$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:
$output = implode(', ', array_map(
function ($v, $k) { return sprintf("%s='%s'", $k, $v); },
$input,
array_keys($input)
));
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):
$array = [
'test0' => 344,
'test1' => 235,
'test2' => 876,
...
];
Test number one:
Use http_build_query and str_replace:
str_replace('=', ':', http_build_query($array, null, ','));
Average time to implode 1000 elements: 0.00012930955084904
Test number two:
Use array_map and implode:
implode(',', array_map(
function ($v, $k) {
return $k.':'.$v;
},
$array,
array_keys($array)
));
Average time to implode 1000 elements: 0.0004890081976675
Test number three:
Use array_walk and implode:
array_walk($array,
function (&$v, $k) {
$v = $k.':'.$v;
}
);
implode(',', $array);
Average time to implode 1000 elements: 0.0003874126245348
Test number four:
Use foreach:
$str = '';
foreach($array as $key=>$item) {
$str .= $key.':'.$item.',';
}
rtrim($str, ',');
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
I would use serialize()
or 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.