问题
I have the following array that includes id:
[Key1] => 1
[Key2] => 2, 3
I would like to replace these ids by their respective name from this second array:
[0] => Array
(
[ID] => 1
[Name] => Name1
)
[1] => Array
(
[ID] => 2
[Name] => Name2
)
[2] => Array
(
[ID] => 3
[Name] => Name3
The desired output:
[Key1] => Name1
[Key2] => Name2, Name3
I have the following code which works but I know this is not the right way. If anybody could let me know what would be a better way to achieve this, it would be greatly appreciated.
What my code looks like:
$var1 = explode(", ", $array1["Key1"]); // No need to explode in this example but "Key1" sometimes includes more than 1 ID
$var2 = explode(", ", $array1["Key2"]);
$array1["Key1"] = $var1 ; // This row is for the new array generated from "explode" to be a sub-array
$array1["Key2"] = $var2 ; // Same
for ($i = 0; $i < 83; $i++){
if($array1["Key1"][0] == $array2[$i]["ID"]){
$array1["Key1"][0] = $array2[$i]["Name"];
}
if($array1["Key1"][1] == $array2[$i]["ID"]){
$array1["Key1"][1] = $array2[$i]["Name"];
}
// (etc)
if($array1["Key2"][0] == $array2[$i]["ID"]){
$array1["Key2"][0] = $array2[$i]["Name"];
}
if($array1["Key2"][1] == $array2[$i]["ID"]){
$array1["Key2"][1] = $array2[$i]["Name"];
}
// (etc)
}
$var1 = implode(", ", $array1["Key1"]);
$var2 = implode(", ", $array1["Key2"]);
$array1["Key1"] = $var1 ;
$array1["Key2"] = $var2 ;
回答1:
Just extract the ID and Name into a single-dimension and use it as search and replace parameters. We need to modify the IDs to search for and turn them into a pattern /\b$v\b/ where \b is a word boundary, so that 1 won't replace the 1 in 164 for example:
$replace = array_column($array2, 'Name', 'ID');
$search = array_map(function($v) { return "/\b$v\b/"; }, array_keys($replace));
$array1 = preg_replace($search, $replace, $array1);
回答2:
You need to nest some loops. Here is a sample that should work:
//Processing Array
$arrayOne = array(
"Key1" => "1",
"Key2" => "2, 3");
//Lookup Array
$arrayTwo = array(
array(
"ID" => "1",
"Name" => "Name1"),
array(
"ID" => "2",
"Name" => "Name2"),
array(
"ID" => "3",
"Name" => "Name3"));
var_dump($arrayOne);
//Loop through all values in our original array
foreach($arrayOne as &$arrValue) {
//Split the value in the original array into another temporary array
//if there are multiple values.
$valueArray = explode(", ", $arrValue);
$outputArray = array();
foreach($valueArray as &$myValue) {
//Now do a lookup to replace each value
foreach($arrayTwo as &$lookupValue) {
//Find a match
if($myValue==$lookupValue["ID"]) {
$myValue = $lookupValue["Name"];
//We found the value we want, so let's break out of this loop
break;
}
}
//Append the value
array_push($outputArray, $myValue);
}
//Convert back to string
$arrValue= implode(", ", $outputArray);
}
var_dump($arrayOne);
There are improvements you could possibly make to this code if your incoming data was always sorted, but I imagine that is just the case for your sample above.
回答3:
I have an approach to do this. You can make a try if you wish see here at:- https://eval.in/839823. I am using array_column to map the key=>value pair and then simple used foreach.
<?php
$main = ['Key1' => 1,'Key2' => '2, 3'];
$match = [
[
'ID' => 1,
'Name' => 'Name1'
],
[
'ID' => 2,
'Name' => 'Name2'
],
[
'ID' => 3,
'Name' => 'Name3'
]
];
$final_array=[];
$mapped = array_column($match, 'Name', 'ID');
foreach($main as $k=>$v){
$r = explode(',',$v);
if(count($r)>1){
$final_array[$k] = $mapped[$r[0]]. ", ".$mapped[intval($r[1])];
}else{
$final_array[$k] = $mapped[$r[0]];
}
}
print '<pre>';
//print_r($mapped);
print_r($final_array);
print '</pre>';
Output :
Array
(
[Key1] => Name1
[Key2] => Name2,Name3
)
Edit : As per comment of Josh Maag,
My code will only work if he only has a maximum of 2 values in Key2. If Key3 contains "4,5,6" this code will leave the 6 untouched.
<?php
$main = ['Key1' => 1,'Key2' => '2,3','Key3' => '4,5,6'];
$match = [
[
'ID' => 1,
'Name' => 'Name1'
],
[
'ID' => 2,
'Name' => 'Name2'
],
[
'ID' => 3,
'Name' => 'Name3'
],
[
'ID' => 4,
'Name' => 'Name4'
],
[
'ID' => 5,
'Name' => 'Name5'
],
[
'ID' => 6,
'Name' => 'Name6'
]
];
$final_array=[];
$mapped = array_column($match, 'Name', 'ID');
foreach($main as $k=>$v){
$r = explode(',',$v);
if(count($r)>1){
$final_array[$k] = implode(',',array_map(function($key) use ($mapped){ return $mapped[$key]; }, array_values($r)));
}else{
$final_array[$k] = $mapped[$r[0]];
}
}
print '<pre>';
print_r($mapped);
print_r($final_array);
print '</pre>';
?>
See demo See here https://eval.in/839939
回答4:
The core function that should be used for this task is preg_replace_callback(). Why? Because it is uniquely qualified to handle this operation in a single function call. It seems a tragedy to not use php functions for their designed purpose.
Beyond preg_replace_callback(), only array_column() is needed to prepare the $array2 data as a simple lookup array.
Code: (Demo)
$array1=["Key1"=>"1","Key2"=>"22, 4, 123"];
$array2=[["ID"=>"1","Name"=>"Name1"],["ID"=>"22","Name"=>"Name22"],["ID"=>"123","Name"=>"Name123"]];
$lookup=array_column($array2,'Name','ID'); // generate array: keys = IDs, vals = Names
$result=preg_replace_callback('/\d+/',function($m)use($lookup){return isset($lookup[$m[0]])?$lookup[$m[0]]:"*{$m[0]}*";},$array1);
var_export($result);
Output:
array (
'Key1' => 'Name1',
'Key2' => 'Name22, **4**, Name123',
)
There is no need to run any preparations (excluding $lookup) using additional loops or function calls.
This pattern will match all full ID numbers from each element in $array1 and process them individual. Each numeric match is sent to the anonymous callback function to receive its customized replacement string -- delivered by the $lookup data.
As an additional consideration, I have included an asterisk-wrapped replacement when an ID is not found in $lookup.
来源：https://stackoverflow.com/questions/45420274/what-is-a-better-way-to-replace-ids-in-an-array-with-their-value-counterpart