PHP: Check duplicate array key in objects array.

Question

I have an objects array as following

 [{"ChannelName":"39-40","Text":"haha"},
  {"ChannelName":"39-40","Text":"lala"}
  {"ChannelName":"40-41","Text":"bla bla"},
  {"ChannelName":"40-41","Text":"kha kha"}]

How can I check duplicate value in ChannelName. What I need to do is when ChannelName exists in array object, I want to replace the ChannelName with new Text. How php check duplicate ChannelName and how to replace of old Text attribute with new Text attribute if ChannelName duplicate?

Possible duplicate of Find duplicates in array of objects on the basis of specific keys — Andrea Carraro
– Andrea Carraro, Commented May 19, 2017 at 13:01

Saurabh Parekh · Accepted Answer · 2017-05-19 10:09:06Z

1

Try this solution.

$json = <<<JSON
[{"ChannelName":"39-40","Text":"haha"},
{"ChannelName":"39-40","Text":"lala"},
{"ChannelName":"40-41","Text":"bla bla"},
{"ChannelName":"40-41","Text":"kha kha"}]
JSON;

$json_array = json_decode( $json, TRUE );

$new_array = array();
$exists_array    = array();
foreach( $json_array as $element ) {
    if( !in_array( $element['ChannelName'], $exists_array )) {
        $exists_array[]    = $element['ChannelName'];
    }
    else{
        $element['ChannelName'] = 'New Value';
    }
    $new_array[] = $element;
}

print json_encode( $new_array );

Here at New Value section you can change your value as per your requirement.

answered May 19, 2017 at 10:09

Saurabh Parekh

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