จะสอบถามเรื่อง json ว่าจะมีวิธีแยกข้อความออกมายังไงบ้าง

$array['keyname'] = 'ข้อมูลใหม่';
echo $array['keyname'];

$object->keyname = 'ข้อมูลใหม่';
echo $object->keyname;

<?php
$arr = array();

for($i=0; $i<4; $i++)
{
	 $data= array("key"=>'api-'.$i, "value"=>$i*2);
	
	array_push($arr,$data);
}

//print_r($arr);

$response = json_encode($arr);

print_r($response);

// Rest API part
$data = [
	"data" => "key=IAfpK, age=58, key=WNVdi, age=64, key=jp9zt, age=47, key=0Sr4C, age=68, key=CGEqo, age=76, key=IxKVQ, age=79, key=eD221, age=29, key=XZbHV, age=32, key=k1SN5, age=88, key=4SCsU, age=65, key=q3kG6, age=33, key=MGQpf, age=13, key=Kj6xW, age=14, key=tg2VM, age=30, key=WSnCU, age=24, key=f1Vvz, age=46, key=dOS7A, age=72, key=tDojg, age=82, key=nZyJA, age=48, key=R8JTk, age=29, key=005Ot, age=66, key=HHROm, age=12, key=5yzG8, age=51, key=xMJ5D, age=38, key=TXtVu, age=82, key=Hz38B, age=84, key=WfObU, age=27, key=mmqYB, age=14, key=4Z3Ay, age=62, key=x3B0i, age=55, key=QCiQB, age=72, key=zGtmR, age=66, key=nlIN9, age=8, key=hKalB, age=50, key=Na33O, age=17, key=jMeXm, age=15, key=OO2Mc, age=32, key=hhowx, age=34, key=gLMJf, age=60, key=PblX6, age=66, key=8Vm5W, age=22, key=oZKd6, age=88, key=RXNfQ, age=25, key=3yy0p, age=64, key=FrQbL, age=80, key=vlUkk, age=55, key=DP8po, age=80, key=EroX6, age=84, key=3bsll, age=86, key=QhZjA, age=85, key=wm6uc, age=74"
];

$j = json_encode($data);

// ---------------------------------------------------------------------------------------------------------------------


// convert JSON data to array

$d = json_decode($j, true); // ได้ข้อมูลเหมือน จขกท.

//print_r($d);  // พิสูจน์ข้อมูลเหมือน จขกท.

//echo $d["data"];


// ตัวอย่างขั้นตอนการแยก string ด้วย delimiter(ตัวคั่น)
$dSplit = explode(", ", $d["data"]);

//print_r($dSplit);

// วนและเก็บข้อมูลตามเงื่อนไข
$c = [];
for ($i = 0; $i < count($dSplit); $i++) {
	if ($i % 2 !== 0) {
 		$c[] = [
        	"key" => explode("=", $dSplit[$i-1])[1],
            "age" => explode("=", $dSplit[$i])[1]
        ];   
    } 
}