array_unique 移除数组中重复的值 &reftitle.description; arrayarray_unique arrayarray intsort_flagsSORT_STRING array_unique 接受 array 作为输入并返回没有重复值的新数组。 注意键名保留不变。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。 当且仅当 (string) $elem1 === (string) $elem2 时两个单元被认为相同。就是说，当字符串的表达一样时。 第一个单元将被保留。 &reftitle.parameters; array 输入的数组。 sort_flags The optional second parameter sort_flags may be used to modify the sorting behavior using these values: Sorting type flags: SORT_REGULAR - compare items normally (don't change types) SORT_NUMERIC - compare items numerically SORT_STRING - compare items as strings SORT_LOCALE_STRING - compare items as strings, based on the current locale. &reftitle.returnvalues; Returns the filtered array. &reftitle.changelog; &Version; &Description; 5.2.10 Changed the default value of sort_flags back to SORT_STRING. 5.2.9 Added the optional sort_flags defaulting to SORT_REGULAR. Prior to 5.2.9, this function used to sort the array with SORT_STRING internally. &reftitle.examples; "green", "red", "b" => "green", "blue", "red"); $result = array_unique($input); print_r($result); ?> ]]> &example.outputs; green [0] => red [1] => blue ) ]]> ]]> &example.outputs; int(4) [2] => string(1) "3" } ]]> &reftitle.seealso; array_count_values &reftitle.notes; Note that array_unique is not intended to work on multi dimensional arrays.