比如:$arr = [ 1=>'老王', 2=>'老张', 3=>'老李'];我需要这样的数据。$arr = [ '老王'=>1, '老张'=>2, '老李'=>3];
用 array_flip.
用函数array_flip()
输出结果:Array ( [red] => a [green] => b [blue] => c [yellow] => d )