PHP array_unique() 函数
PHP array_unique() 函数
PHP Array 函数
定义和用法
array_unique() 函数移除数组中的重复的值,并返回结果数组。
当几个数组元素的值相等时,只保留第一个元素,其他的元素被删除。
返回的数组中键名不变。
语法array_unique(array)
array | 必需。规定输入的数组。 |
array_unique() 先将值作为字符串排序,然后对每个值只保留第一个遇到的键名,接着忽略所有后面的键名。这并不意味着在未排序的 array 中同一个值的第一个出现的键名会被保留。
提示和注释
注释:被返回的数组将保持第一个数组元素的键类型。
例子
<?php$a=array("a"=>"Cat","b"=>"Dog","c"=>"Cat");print_r(array_unique($a));?>
输出:
Array ( [a] => Cat [b] => Dog )

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