以下是我的数组。我需要根据每个 emp_firstname 添加它的 Sum 字段。有的只来一次,有的来两次。我们如何对字段求和并使数组唯一?Array( [0] => Array ( [emp_firstname] => Alistair [non_pm] => AMZ [sum] => 2 ) [1] => Array ( [emp_firstname] => Shakkeer [non_pm] => SHK [sum] => 3 ) [2] => Array ( [emp_firstname] => Waqas [non_pm] => WAS [sum] => 12 ) [3] => Array ( [emp_firstname] => Zain [non_pm] => ZAI [sum] => 9 ) [4] => Array ( [emp_firstname] => Shakkeer [gud_pmeditor] => SHK [sum] => 4 ) [5] => Array ( [emp_firstname] => Zain [gud_pmeditor] => ZAI [sum] => 2 ))
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