title: Access Values of JSON Multi Dimensional Array in PHP
body: <p>I have attempted to parse the below ($var) using both</p>
  
  <pre><code>$convert = json_encode($var);
  $object  = (object)json_decode($convert);
  $array   = json_decode($convert, TRUE);
  </code></pre>
  
  <p>but appear to be unable to access values (typically seeing nothing/null), through something like $array->messages->event.</p>
  
  <p>I've been cross referencing against some example code at <a href="https://gist.githubusercontent.com/eurica/6034108/raw/10e7fbce580e515db0f0b74d49c812da4e5ce40b/PagerDutyWebhookToEmail.php" rel="nofollow noreferrer">https://gist.githubusercontent.com/eurica/6034108/raw/10e7fbce580e515db0f0b74d49c812da4e5ce40b/PagerDutyWebhookToEmail.php</a>. However, it appears to be dated (v1 payload instead of v2).</p>
  
  <p>My goal is to pull different values, at different levels, to create a custom email. Documentation suggests there could be multiple "message" under "messages" and therefore a foreach could be necessary?</p>
  
  <p>X-REF <a href="https://community.pagerduty.com/t/how-do-i-notify-a-distribution-list-or-shared-group-email-address/1519" rel="nofollow noreferrer">https://community.pagerduty.com/t/how-do-i-notify-a-distribution-list-or-shared-group-email-address/1519</a> &amp; <a href="https://v2.developer.pagerduty.com/docs/webhooks-v2-overview" rel="nofollow noreferrer">https://v2.developer.pagerduty.com/docs/webhooks-v2-overview</a></p>
  
  <pre><code>{
  "messages": [{
    "event": "incident.trigger",
    "log_entries": [
      {
        "id": "R2XGXEI3W0FHMSDXHDIBQGBQ5E",
        "type": "trigger_log_entry",
        "summary": "Triggered through the website",
        "self": "https://api.pagerduty.com/log_entries/R2XGXEI3W0FHMSDXHDIBQGBQ5E",
        "html_url": "https://webdemo.pagerduty.com/incidents/PRORDTY/log_entries/R2XGXEI3W0FHMSDXHDIBQGBQ5E",
        "created_at": "2017-09-26T15:14:36Z",
        "agent": {
          "id": "P553OPV",
          "type": "user_reference",
          "summary": "Laura Haley",
          "self": "https://api.pagerduty.com/users/P553OPV",
          "html_url": "https://webdemo.pagerduty.com/users/P553OPV"
        },
        "channel": {
          "type": "web_trigger",
          "summary": "My new incident",
          "subject": "My new incident",
          "details": "Oh my gosh"
        },
        "service": {
          "id": "PN49J75",
          "type": "service_reference",
          "summary": "Production XDB Cluster",
          "self": "https://api.pagerduty.com/services/PN49J75",
          "html_url": "https://webdemo.pagerduty.com/services/PN49J75"
        },
        "incident": {
          "id": "PRORDTY",
          "type": "incident_reference",
          "summary": "[#33] My new incident",
          "self": "https://api.pagerduty.com/incidents/PRORDTY",
          "html_url": "https://webdemo.pagerduty.com/incidents/PRORDTY"
        },
        "teams": [
          {
            "id": "P4SI59S",
            "type": "team_reference",
            "summary": "Engineering",
            "self": "https://api.pagerduty.com/teams/P4SI59S",
            "html_url": "https://webdemo.pagerduty.com/teams/P4SI59S"
          }
        ],
        "contexts": [],
        "event_details": {
          "description": "My new incident"
        }
      }
    ],
    "webhook": {
      "endpoint_url": "https://requestb.in/18ao6fs1",
      "name": "V2 wabhook",
      "description": null,
      "webhook_object": {
        "id": "PN49J75",
        "type": "service_reference",
        "summary": "Production XDB Cluster",
        "self": "https://api.pagerduty.com/services/PN49J75",
        "html_url": "https://webdemo.pagerduty.com/services/PN49J75"
      },
      "config": {},
      "outbound_integration": {
        "id": "PJFWPEP",
        "type": "outbound_integration_reference",
        "summary": "Generic V2 Webhook",
        "self": "https://api.pagerduty.com/outbound_integrations/PJFWPEP",
        "html_url": null
      },
      "accounts_addon": null,
      "id": "PKT9NNX",
      "type": "webhook",
      "summary": "V2 wabhook",
      "self": "https://api.pagerduty.com/webhooks/PKT9NNX",
      "html_url": null
    },
    "incident": {
      "incident_number": 33,
      "title": "My new incident",
      "description": "My new incident",
      "created_at": "2017-09-26T15:14:36Z",
      "status": "triggered",
      "pending_actions": [
        {
          "type": "escalate",
          "at": "2017-09-26T15:44:36Z"
        },
        {
          "type": "resolve",
          "at": "2017-09-26T19:14:36Z"
        }
      ],
      "incident_key": "56a1c5594fe340408230783eebf43be6",
      "service": {
        "id": "PN49J75",
        "name": "Production XDB Cluster",
        "description": "This service was created during onboarding on July 5, 2017.",
        "auto_resolve_timeout": 14400,
        "acknowledgement_timeout": 1800,
        "created_at": "2017-07-05T17:33:09Z",
        "status": "critical",
        "last_incident_timestamp": "2017-09-26T15:14:36Z",
        "teams": [
          {
            "id": "P4SI59S",
            "type": "team_reference",
            "summary": "Engineering",
            "self": "https://api.pagerduty.com/teams/P4SI59S",
            "html_url": "https://webdemo.pagerduty.com/teams/P4SI59S"
          }
        ],
        "incident_urgency_rule": {
          "type": "constant",
          "urgency": "high"
        },
        "scheduled_actions": [],
        "support_hours": null,
        "escalation_policy": {
          "id": "PINYWEF",
          "type": "escalation_policy_reference",
          "summary": "Default",
          "self": "https://api.pagerduty.com/escalation_policies/PINYWEF",
          "html_url": "https://webdemo.pagerduty.com/escalation_policies/PINYWEF"
        },
        "addons": [],
        "privilege": null,
        "alert_creation": "create_alerts_and_incidents",
        "integrations": [
          {
            "id": "PUAYF96",
            "type": "generic_events_api_inbound_integration_reference",
            "summary": "API",
            "self": "https://api.pagerduty.com/services/PN49J75/integrations/PUAYF96",
            "html_url": "https://webdemo.pagerduty.com/services/PN49J75/integrations/PUAYF96"
          },
          {
            "id": "P90GZUH",
            "type": "generic_email_inbound_integration_reference",
            "summary": "Email",
            "self": "https://api.pagerduty.com/services/PN49J75/integrations/P90GZUH",
            "html_url": "https://webdemo.pagerduty.com/services/PN49J75/integrations/P90GZUH"
          }
        ],
        "metadata": {},
        "type": "service",
        "summary": "Production XDB Cluster",
        "self": "https://api.pagerduty.com/services/PN49J75",
        "html_url": "https://webdemo.pagerduty.com/services/PN49J75"
      },
      "assignments": [
        {
          "at": "2017-09-26T15:14:36Z",
          "assignee": {
            "id": "P553OPV",
            "type": "user_reference",
            "summary": "Laura Haley",
            "self": "https://api.pagerduty.com/users/P553OPV",
            "html_url": "https://webdemo.pagerduty.com/users/P553OPV"
          }
        }
      ],
      "acknowledgements": [],
      "last_status_change_at": "2017-09-26T15:14:36Z",
      "last_status_change_by": {
        "id": "PN49J75",
        "type": "service_reference",
        "summary": "Production XDB Cluster",
        "self": "https://api.pagerduty.com/services/PN49J75",
        "html_url": "https://webdemo.pagerduty.com/services/PN49J75"
      },
      "first_trigger_log_entry": {
        "id": "R2XGXEI3W0FHMSDXHDIBQGBQ5E",
        "type": "trigger_log_entry_reference",
        "summary": "Triggered through the website",
        "self": "https://api.pagerduty.com/log_entries/R2XGXEI3W0FHMSDXHDIBQGBQ5E",
        "html_url": "https://webdemo.pagerduty.com/incidents/PRORDTY/log_entries/R2XGXEI3W0FHMSDXHDIBQGBQ5E"
      },
      "escalation_policy": {
        "id": "PINYWEF",
        "type": "escalation_policy_reference",
        "summary": "Default",
        "self": "https://api.pagerduty.com/escalation_policies/PINYWEF",
        "html_url": "https://webdemo.pagerduty.com/escalation_policies/PINYWEF"
      },
      "privilege": null,
      "teams": [
        {
          "id": "P4SI59S",
          "type": "team_reference",
          "summary": "Engineering",
          "self": "https://api.pagerduty.com/teams/P4SI59S",
          "html_url": "https://webdemo.pagerduty.com/teams/P4SI59S"
        }
      ],
      "alert_counts": {
        "all": 0,
        "triggered": 0,
        "resolved": 0
      },
      "impacted_services": [
        {
          "id": "PN49J75",
          "type": "service_reference",
          "summary": "Production XDB Cluster",
          "self": "https://api.pagerduty.com/services/PN49J75",
          "html_url": "https://webdemo.pagerduty.com/services/PN49J75"
        }
      ],
      "is_mergeable": true,
      "basic_alert_grouping": null,
      "alert_grouping": null,
      "metadata": {},
      "external_references": [],
      "importance": null,
      "incidents_responders": [],
      "responder_requests": [],
      "subscriber_requests": [],
      "urgency": "high",
      "id": "PRORDTY",
      "type": "incident",
      "summary": "[#33] My new incident",
      "self": "https://api.pagerduty.com/incidents/PRORDTY",
      "html_url": "https://webdemo.pagerduty.com/incidents/PRORDTY"
    },
    "id": "69a7ced0-a2cd-11e7-a799-22000a15839c",
    "created_on": "2017-09-26T15:14:36Z"
  }
  ]}
  </code></pre>
  
  <p>Answer Testing:</p>
  
  <pre><code>echo $object-&gt;messages[0]-&gt;event;
  Notice: Undefined property: stdClass::$messages in 
  /var/www/pagerduty/public_html/wh/index.php on line 251
  
  echo $array-&gt;messages[0]-&gt;event;
  Notice: Trying to get property of non-object in 
  /var/www/pagerduty/public_html/wh/index.php on line 255
  
  echo $array['messages'][0]['event']
  Warning: Illegal string offset 'messages' in 
  /var/www/pagerduty/public_html/wh/index.php on line 258
  Warning: Illegal string offset 'event' in 
  /var/www/pagerduty/public_html/wh/index.php on line 258
  {
  
  print_r($array);
  { "messages": [ { "event": "incident.trigger", "log_entries": [ { "id": "R2XGXEI3W0FHMSDXHDIBQGBQ5E", "type": "trigger_log_entry", "summary": "Triggered through the website", "self": "https://api.pagerduty.com/log_entries/R2XGXEI3W0FHMSDXHDIBQGBQ5E", "html_url": "https://webdemo.pagerduty.com/incidents/PRORDTY/log_entries/R2XGXEI3W0FHMSDXHDIBQGBQ5E", "created_at": "2017-09-26T15:14:36Z", "agent": { "id": "P553OPV", "type": "user_reference", "summary": "Laura Haley", "self": "https://api.pagerduty.com/users/P553OPV", "html_url": "https://webdemo.pagerduty.com/users/P553OPV" }, "channel": { "type": "web_trigger", "summary": "My new incident", "subject": "My new incident", "details": "Oh my gosh" }, "service": { "id": "PN49J75", "type": "service_reference", "summary": "Production XDB Cluster", "self": "https://api.pagerduty.com/services/PN49J75", "html_url": "https://webdemo.pagerduty.com/services/PN49J75" }, "incident": { "id": "PRORDTY", "type": "incident_reference", "summary": "[#33] My new incident", "self": "https://api.pagerduty.com/incidents/PRORDTY", "html_url": "https://webdemo.pagerduty.com/incidents/PRORDTY" }, "teams": [ { "id": "P4SI59S", "type": "team_reference", "summary": "Engineering", "self": "https://api.pagerduty.com/teams/P4SI59S", "html_url": "https://webdemo.pagerduty.com/teams/P4SI59S" } ], "contexts": [], "event_details": { "description": "My new incident" } } ], "webhook": { "endpoint_url": "https://requestb.in/18ao6fs1", "name": "V2 wabhook", "description": null, "webhook_object": { "id": "PN49J75", "type": "service_reference", "summary": "Production XDB Cluster", "self": "https://api.pagerduty.com/services/PN49J75", "html_url": "https://webdemo.pagerduty.com/services/PN49J75" }, "config": {}, "outbound_integration": { "id": "PJFWPEP", "type": "outbound_integration_reference", "summary": "Generic V2 Webhook", "self": "https://api.pagerduty.com/outbound_integrations/PJFWPEP", "html_url": null }, "accounts_addon": null, "id": "PKT9NNX", "type": "webhook", "summary": "V2 wabhook", "self": "https://api.pagerduty.com/webhooks/PKT9NNX", "html_url": null }, "incident": { "incident_number": 33, "title": "My new incident", "description": "My new incident", "created_at": "2017-09-26T15:14:36Z", "status": "triggered", "pending_actions": [ { "type": "escalate", "at": "2017-09-26T15:44:36Z" }, { "type": "resolve", "at": "2017-09-26T19:14:36Z" } ], "incident_key": "56a1c5594fe340408230783eebf43be6", "service": { "id": "PN49J75", "name": "Production XDB Cluster", "description": "This service was created during onboarding on July 5, 2017.", "auto_resolve_timeout": 14400, "acknowledgement_timeout": 1800, "created_at": "2017-07-05T17:33:09Z", "status": "critical", "last_incident_timestamp": "2017-09-26T15:14:36Z", "teams": [ { "id": "P4SI59S", "type": "team_reference", "summary": "Engineering", "self": "https://api.pagerduty.com/teams/P4SI59S", "html_url": "https://webdemo.pagerduty.com/teams/P4SI59S" } ], "incident_urgency_rule": { "type": "constant", "urgency": "high" }, "scheduled_actions": [], "support_hours": null, "escalation_policy": { "id": "PINYWEF", "type": "escalation_policy_reference", "summary": "Default", "self": "https://api.pagerduty.com/escalation_policies/PINYWEF", "html_url": "https://webdemo.pagerduty.com/escalation_policies/PINYWEF" }, "addons": [], "privilege": null, "alert_creation": "create_alerts_and_incidents", "integrations": [ { "id": "PUAYF96", "type": "generic_events_api_inbound_integration_reference", "summary": "API", "self": "https://api.pagerduty.com/services/PN49J75/integrations/PUAYF96", "html_url": "https://webdemo.pagerduty.com/services/PN49J75/integrations/PUAYF96" }, { "id": "P90GZUH", "type": "generic_email_inbound_integration_reference", "summary": "Email", "self": "https://api.pagerduty.com/services/PN49J75/integrations/P90GZUH", "html_url": "https://webdemo.pagerduty.com/services/PN49J75/integrations/P90GZUH" } ], "metadata": {}, "type": "service", "summary": "Production XDB Cluster", "self": "https://api.pagerduty.com/services/PN49J75", "html_url": "https://webdemo.pagerduty.com/services/PN49J75" }, "assignments": [ { "at": "2017-09-26T15:14:36Z", "assignee": { "id": "P553OPV", "type": "user_reference", "summary": "Laura Haley", "self": "https://api.pagerduty.com/users/P553OPV", "html_url": "https://webdemo.pagerduty.com/users/P553OPV" } } ], "acknowledgements": [], "last_status_change_at": "2017-09-26T15:14:36Z", "last_status_change_by": { "id": "PN49J75", "type": "service_reference", "summary": "Production XDB Cluster", "self": "https://api.pagerduty.com/services/PN49J75", "html_url": "https://webdemo.pagerduty.com/services/PN49J75" }, "first_trigger_log_entry": { "id": "R2XGXEI3W0FHMSDXHDIBQGBQ5E", "type": "trigger_log_entry_reference", "summary": "Triggered through the website", "self": "https://api.pagerduty.com/log_entries/R2XGXEI3W0FHMSDXHDIBQGBQ5E", "html_url": "https://webdemo.pagerduty.com/incidents/PRORDTY/log_entries/R2XGXEI3W0FHMSDXHDIBQGBQ5E" }, "escalation_policy": { "id": "PINYWEF", "type": "escalation_policy_reference", "summary": "Default", "self": "https://api.pagerduty.com/escalation_policies/PINYWEF", "html_url": "https://webdemo.pagerduty.com/escalation_policies/PINYWEF" }, "privilege": null, "teams": [ { "id": "P4SI59S", "type": "team_reference", "summary": "Engineering", "self": "https://api.pagerduty.com/teams/P4SI59S", "html_url": "https://webdemo.pagerduty.com/teams/P4SI59S" } ], "alert_counts": { "all": 0, "triggered": 0, "resolved": 0 }, "impacted_services": [ { "id": "PN49J75", "type": "service_reference", "summary": "Production XDB Cluster", "self": "https://api.pagerduty.com/services/PN49J75", "html_url": "https://webdemo.pagerduty.com/services/PN49J75" } ], "is_mergeable": true, "basic_alert_grouping": null, "alert_grouping": null, "metadata": {}, "external_references": [], "importance": null, "incidents_responders": [], "responder_requests": [], "subscriber_requests": [], "urgency": "high", "id": "PRORDTY", "type": "incident", "summary": "[#33] My new incident", "self": "https://api.pagerduty.com/incidents/PRORDTY", "html_url": "https://webdemo.pagerduty.com/incidents/PRORDTY" }, "id": "69a7ced0-a2cd-11e7-a799-22000a15839c", "created_on": "2017-09-26T15:14:36Z" } ] }
  </code></pre>