仅从数组中提取值，以使用PHP在JSON中对它们进行编码

This has probably been asked many times but I can't find a solution for my case.

This is my array :

$request=Array ( 
        [0] => Array ( [staName] => Auditorium Stravinsky 2m2c ) 
        [1] => Array ( [staName] => Geneva Arena ) 
        [2] => Array ( [staName] => Les Docks ) 
        [3] => Array ( [staName] => Kheops ) 
    )

And i need an output as follows as JSON:

"Auditorium Stravinsky 2m2c ","Geneva Arena","Les Docks","Kheops"

My current code is as follows:

    foreach($request as $value)
    {
        $names[]=$value;
    }

    $jsonValue = json_encode(array_values($names));

    print_r($jsonValue);

And my current output is as follows in JSON format:

[{"staName":"Auditorium Stravinsky 2m2c "},{"staName":"Geneva Arena"},{"staName":"Les Docks"},{"staName":"Kheops"}]

How can i stop "staName " from being outputed?

Many thanks in advance and please be considerate of my post as this is only the second one I make on this site.

<?php

$request=Array (
        0 => Array ( 'staName' => 'Auditorium Stravinsky 2m2c' ) ,
        1 => Array ( 'staName' => 'Geneva Arena' ) ,
        2 => Array ( 'staName' => 'Les Docks' ) ,
        3 => Array ( 'staName' => 'Kheops' )
    );


$newArray=array();
for($i=0;$i<count($request);$i++){
    $newArray[$i]=$request[$i]['staName'];
}

$newArray=json_encode($newArray,true);
print_r($newArray);

And the output is a merged json:

["Auditorium Stravinsky 2m2c","Geneva Arena","Les Docks","Kheops"]

You can achieve this from,
Code

$a = array();
foreach($request as $key =>$val){
  foreach($val as $k => $v){
   $a[] = $v;
  }
}
print_r(json_encode($a));

Check this Demo link

Output

["Auditorium Stravinsky 2m2c","Geneva Arena","Les Docks","Kheops"]

fist of all your array definition are not correct. and your output is simple string not a JSON

<?php

$request=Array ( 
        0 => Array ( 'staName' => 'Auditorium Stravinsky 2m2c' ), 
        1 => Array ( 'staName' => 'Geneva Arena' ) ,
        2 => Array ( 'staName' => 'Les Docks' ) ,
        3 => Array ( 'staName' => 'Kheops' ) 
    );

    $name = '';
    foreach($request as $value)
    {
        foreach($value as $value2)
        {
            $name = $name . ' ' . $value2;
        }

    }
    echo $name;

Output

Auditorium Stravinsky 2m2c Geneva Arena Les Docks Kheops