Home Backend Development PHP Tutorial PHP array_flip() 删除重复数组元素专用函数_PHP

PHP array_flip() 删除重复数组元素专用函数_PHP

Jun 01, 2016 pm 12:18 PM
array_flip php

说明
  array array_flip ( array trans )
  array_flip() 返回一个反转后的 array,例如 trans 中的键名变成了值,而 trans 中的值成了键名。
  注意 trans 中的值需要能够作为合法的键名,例如需要是 integer 或者 string。如果值的类型不对将发出一个警告,并且有问题的键/值对将不会反转。
  如果同一个值出现了多次,则最后一个键名将作为它的值,所有其它的都丢失了。
  array_flip() 如果失败返回 FALSE。
  实例:
复制代码 代码如下:
  $hills=array("first"=>"data1″,"second"=>"data2″,"third"=>"data1″);
  $hills=array_flip($hills); //还原键名
  $hills1=array_flip(array_flip($hills));//删除重复
  display $hills1

结果是:

  data2 data1两个数据.

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