ParserExample.php

<?php 

$responses = [
    '{"ErrorCode":"000","ErrorMessage":"Success","JobId":"177e08a8-71d7-40df-9324-1cd957d82964","MessageData":[{"Number":"918237020012","MessageParts":[{"MsgId":"918237020012-8da7cf9f85464458a853c049850a41c8","PartId":1,"Text":"testing completed"}]}]}',
    '{"ErrorCode":"000","ErrorMessage":"Success","JobId":"177e08a8-71d7-40df-9324-1cd957d82964","MessageData":[{"Number":"918237020012","MessageParts":[{"MsgId":"918237020012-8da7cf9f85464458a853c049850a41c8","PartId":1,"Text":"testing completed"}]}]}',
    '{"ErrorCode":"000","ErrorMessage":"Success","JobId":"177e08a8-71d7-40df-9324-1cd957d82964","MessageData":[{"Number":"918237020012","MessageParts":[{"MsgId":"918237020012-8da7cf9f85464458a853c049850a41c8","PartId":1,"Text":"testing completed"}]}]}',
    '{"ErrorCode":"000","ErrorMessage":"Success","JobId":"177e08a8-71d7-40df-9324-1cd957d82964","MessageData":[{"Number":"918237020012","MessageParts":[{"MsgId":"918237020012-8da7cf9f85464458a853c049850a41c8","PartId":1,"Text":"testing completed"}]}]}',
    'this will fail'
];

$parsedResponses = [];
$failedResponses = [];

foreach ($responses as $response) {
    
    $parsedResponse = json_decode($response, true);
    
    if($parsedResponse === NULL){
        $failedResponses[] = $response;
        continue;
    }

    $parsedResponses[] = $parsedResponse;
}