Access Values of JSON Multi Dimensional Array in PHP - php

Question

I have attempted to parse the below ($var) using both
$convert = json_encode($var);
$object = (object)json_decode($convert);
$array = json_decode($convert, TRUE);
but appear to be unable to access values (typically seeing nothing/null), through something like $array->messages->event.
I've been cross referencing against some example code at https://gist.githubusercontent.com/eurica/6034108/raw/10e7fbce580e515db0f0b74d49c812da4e5ce40b/PagerDutyWebhookToEmail.php. However, it appears to be dated (v1 payload instead of v2).
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?
X-REF https://community.pagerduty.com/t/how-do-i-notify-a-distribution-list-or-shared-group-email-address/1519 & https://v2.developer.pagerduty.com/docs/webhooks-v2-overview
{
"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"
}
]}
Answer Testing:
echo $object->messages[0]->event;
Notice: Undefined property: stdClass::$messages in
/var/www/pagerduty/public_html/wh/index.php on line 251
echo $array->messages[0]->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" } ] }

Answer 1

but appear to be unable to access values (typically seeing nothing/null), through something like $array->messages->event.
You can't access $array (that you received through json_decode($convert, true) like that.
Try accessing them like $array['messages'][0]['event']