如何学习PHP array_flip()
定义和用法
array_flip() 函数返回一个反转后的数组，如果同一值出现了多次，则最后一个键名将作为它的值，所有其他的键名都将丢失。
如果原数组中的值的数据类型不是字符串或整数，函数将报错。
语法
array_flip(array)
参数
描述
array必需。规定输入的数组。
例子
"Dog",1=>"Cat",2=>"Horse");print_r(array_flip($a)); ?>
输出：
Array ( [Dog] => 0 [Cat] => 1 [Horse] => 2 )
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