使用PHP foreach循环从JSON数组获取特定的重复值

Question

I have the following JSON array:

{"key1":"Example1","key2":"Example2","key3":"Example3","key4":"Example4","key1":"Example5","key2":"Example6","key3":"Example7","key4":"Example8","key1":"Example9","key2":"Example10","key3":"Example11","key4":"Example12"}

Using PHP is it possible to display a specific recurring value, for example if I wanted to display "key1" in a foreach loop it would return the following:

Example1
Example5
Example9

Appreciate any tips on what to use to do this, thanks.

Answer 1

You aren't going to be able to do this using json_encode because it's not valid JSON. (Keyspace collision)

You are going to need to assemble the object manually.

You might consider creating the individual items, then using implode(). Then you can prepend and append { and }.

<?php
$jsonObject='{"key1":"Example1","key2":"Example2","key3":"Example3","key4":"Example4","key1":"Example5","key2":"Example6","key3":"Example7","key4":"Example8","key1":"Example9","key2":"Example10","key3":"Example11","key4":"Example12"}';

$jsonArray = array_map(
    function($array){
    $keyValue=explode(":",$array);
    return array("key"=>substr($keyValue[0],1,-1),"value"=>substr($keyValue[1],1,-1));

    },
    explode(
        ",",
        substr($jsonObject,1,-1)

    )
);

foreach($jsonArray as $object){
    $output[$object['key']][]=$object['value']; 
}
echo implode("\n",$output['key1']);

?>