<?php $indexed = [ (object)['id' => 'john', 'name' => 'John', 'age' => 29], (object)['id' => 'peter', 'name' => 'Peter', 'age' => 30], (object)['id' => 'harry', 'name' => 'Harry', 'age' => 19], ]; var_export(array_column($indexed, null, 'id'));
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