php 二维数组 根据条件合并成新的二维数组

$arr = [ 0 => [ 'id' => 1, 'name' => '张三', 'phone' => '123456789' ], 1 => [ 'id' => 2, 'name' => '李四', 'phone' => '456789' ], 3 => [

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