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<?php $myArray = array( 0 => "string_value", 1 => "string_value2", 3 => array( 'config' => array( 'option1' => "value1", 'option2' => "value2", ), ), 4 => "string_value3", ); $index; foreach ($myArray as $key => $item){ if (isset($item["config"])) $index = $key; } echo $index;
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