PHP Json object property/value error handling - php

Question

{
"AFL Round 16":{
"4166082":{
"EventID":4166082,
"ParentEventID":3744759,
"MainEvent":"North Melbourne v Hawthorn",
"OutcomeDateTime":"2014-07-06 02:00:00",
"Competitors":{
"Competitors":[
{
"Team":"Hawthorn To Win 40+",
"Win":"3.00"
}
],
"ActiveCompetitors":1,
"TotalCompetitors":1,
"HasWinOdds":true
},
"EventStatus":"Open"
},
"4167064":{
"EventID":4167064,
"ParentEventID":3744759,
"MainEvent":"North Melbourne v Hawthorn",
"OutcomeDateTime":"2014-07-06 02:00:00",
"Competitors":{
"Competitors":[
{
"Team":"Hawthorn (-5.5)",
"Win":"1.86"
},
{
"Team":"North Melbourne (+5.5)",
"Win":"1.86"
}
],
"ActiveCompetitors":2,
"TotalCompetitors":2,
"HasWinOdds":true
},
"EventStatus":"Open"
}
}
}
I am parsing json objects using PHP and here is a sample of my json. Everything is working fine. I just want to check if object property/value exists if yes then throw errors for example i want to check EventID, ParentEventID, OutcomeDateTime, Team (inside Competitors array) are valid property name and they are not null.
This is few lines of my code.
$SortedByDate = array();//Sorted By Date Array i.e key=EventID and value=OutcomeDateTime
//Accessing Root Element0
foreach ($json_a as $root_element => $childnode) {
//Accessing child elements
foreach( $childnode as $cKey => $subChild) {
$OutcomeDateTime_UTC=gmdate('Y-m-d H:i:s', strtotime($subChild['OutcomeDateTime']));
//checking ParentEventID=0 , Competitors array = 2 and OutcomeDateTime is greater than current time + 10 min
if($subChild['ParentEventID']=='0' and is_array($subChild['Competitors']['Competitors']) and count ($subChild['Competitors']['Competitors']) == 2 and $OutcomeDateTime_UTC>=$NewDateTime and !preg_match('/\(Live\)/',$subChild['MainEvent']) ) {
//Inserting values into array
$SortedByDate[$cKey] = $subChild['OutcomeDateTime'];;
}
}
}
I tired to add if(isset($subChild['OutcomeDateTime']) || is_null($subChild['OutcomeDateTime'])) to check if property name is OutcomeDateTime and it is not null and change json proerty's value (OutcomeDateTime) to null but i get an error that "Invalid argument supplied for foreach()"
is there a better way to check property/values before parsing???

Answer 1

Try this and see if it does what you mean. If not, I don't understand. If it does solve your problem I'll explain why...
//Accessing Root Element0
foreach ($json_a as $root_element => &$childnode) {
//Accessing child elements
foreach( $childnode as $cKey => &$subChild) {
$OutcomeDateTime_UTC=gmdate('Y-m-d H:i:s', strtotime($subChild['OutcomeDateTime']));
//checking ParentEventID=0 , Competitors array = 2 and OutcomeDateTime is greater than current time + 10 min
if($subChild['ParentEventID']=='0' && is_array($subChild['Competitors']['Competitors']) && count ($subChild['Competitors']['Competitors']) == 2 && $OutcomeDateTime_UTC>=$NewDateTime && !preg_match('/\(Live\)/',$subChild['MainEvent']) ) {
//Inserting values into array
$SortedByDate[$cKey] = $subChild['OutcomeDateTime'];
}
if(isset($subChild['OutcomeDateTime']) && !is_null($subChild['OutcomeDateTime'])) {
$subChild['OutcomeDateTime'] = null;
}
}
}

Answer 2

I just want to check if object property/value exists if yes then throw errors
Your wording doesn't make sense and little bit odd, maybe you were saying that you want to validate each key (if they exist) and if each value of those keys are not null
for example i want to check EventID, ParentEventID, OutcomeDateTime, Team (inside Competitors array) are valid property name and they are not null.
Here is a fiddle. Try to remove some elements inside the json string to check: Fiddle
$json_a = '{ "AFL Round 16":{ "4166082":{ "EventID":4166082, "ParentEventID":3744759, "MainEvent":"North Melbourne v Hawthorn", "OutcomeDateTime":"2014-07-06 02:00:00", "Competitors":{ "Competitors":[ { "Team":"Hawthorn To Win 40+", "Win":"3.00" } ], "ActiveCompetitors":1, "TotalCompetitors":1, "HasWinOdds":true }, "EventStatus":"Open" }, "4167064":{ "EventID":4167064, "ParentEventID":3744759, "MainEvent":"North Melbourne v Hawthorn", "OutcomeDateTime":"2014-07-06 02:00:00", "Competitors":{ "Competitors":[ { "Team":"Hawthorn (-5.5)", "Win":"1.86" }, { "Team":"North Melbourne (+5.5)", "Win":"1.86" } ], "ActiveCompetitors":2, "TotalCompetitors":2, "HasWinOdds":true }, "EventStatus":"Open" } }}';
$json_a = json_decode($json_a, true);
$json_a = reset($json_a); // ignore these parts since you already know how to get them
$errors = array();
$valid_keys = array('EventID', 'ParentEventID', 'OutcomeDateTime', 'MainEvent', 'Competitors', 'EventStatus');
foreach($json_a as $event_id => $values) {
// check for keys
$keys = array_keys($values);
foreach($valid_keys as $key) {
if(!in_array($key, $keys)) {
// check keys, not valid if it goes here
$errors[] = "<b>$key</b> is missing on your data <br/>";
} else {
// valid keys, check values
if(empty($values[$key])) {
// empty values
$errors[] = "<b>$key</b> has an empty value <br/>";
}
}
}
// next checking, competitors
foreach($values['Competitors']['Competitors'] as $competitors) {
if(empty($competitors)) {
// if competitors is empty
$errors[] = "<b>Competitors</b> has an empty value <br/>";
}
}
}
if(!empty($errors)) {
// not a good error triggering device, just change this to something else
trigger_error('<pre>'.implode($errors).'</pre>', E_USER_ERROR);
}