如何在PHP中重新索引数组?
Array ([2] => Object ( [title] => Section [linked] => 1 )[1] => Object ( [title] => Sub-Section [linked] => 1 )[0] => Object ( [title] => Sub-Sub-Section [linked] => ))
Array ([1] => Object ( [title] => Section [linked] => 1 )[2] => Object ( [title] => Sub-Section [linked] => 1 )[3] => Object ( [title] => Sub-Sub-Section [linked] => ))
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