php中常用数组函数有哪些?
php常用数组函数有:1、“array_key_change_case”函数;2、“array_chunk”函数;3、“array_column”函数;4、“array_combine”函数;5、“array_diff”函数等等。
php常用数组函数总结
1、array_key_change_case($arr,$case):将数组所有的键转化为大写或者小写,$case可设为CASE_LOWER或者CASE_UPPER。
2、array_chunk($arr,$number):把数组分割为有特定($number)个元素的数组块。
3、array_column($arr,$column):返回数组中某一个单列的值。
4、array_combine($arr1,$arr2):合并两个数组为一个新数组,并把$arr1的值作为键,$arr2的值作为值。
5、array_count_values(Array('a','b','c','a','b')):返回数组中所有值出现的次数,函数执行结果:Array ( [a] => 2 [b] => 2 [c] => 1 )。
6、array_diff($arr1,$arr2):返回两个数组的差集(只比较键值)
7、array_diff_key($arr1,$arr2):返回两个数组的差集(只比较键名),该数组返回在$arr1中,但不在 $arr2中的元素。
8、array_intersect($arr1,$arr2):比较数组,返回两个数组的交集。
9、array_key_exists($key,$arr):查询数组中是否存在指定的键名。
10、array_keys($arr):返回数组中所有的键名,并且组成一个新数组。
11、array_map('myFunction',$arr):将用户自定义函数作为回调函数作用在数组的每个元素上,返回一个新数组。
12、array_merge($arr1,$arr2,$arr3.....):合并一个或多个元素为一个新数组,如果两个或更多元素有相同的键名,后者会覆盖前者。
13、array_merge_recursive($arr1,$arr2,$arr3.....):合并一个或多个元素为一个新数组,如果两个或更多元素有相同的键名,后者不会覆盖前者,而会递归创建一个新数组。
14、array_pop($arr):删除数组中的最后一个元素(出栈)。
15、array_product(Array(1,2,3)):计算数组中所有值的乘积。
16、array_push($arr,'a','b'):将一个或多个元素插入数组的末尾(入栈)。
17、array_rand($arr,number):返回一个包含随机键名的数组。
18、array_replace($arr1,$arr2):后面数组的值替换前面数组的值。
19、array_reverse($arr1,$arr2):将数组中的元素逆序输出(反转)
20、array_search('a',$arr):在数组中搜索给定的键名,成功的话返回它的键名。
21、array_shift():删除数组中的第一个元素,并返回被删除元素的值。
22、array_sum():返回数组中所有值的和。
23、array_unshift():在数组开头插入一个或多个元素。
24、array_values():返回数组中所有的值。
25、array_walk($arr,'myFunction'):对数组中的每个成员应用自定义函数。
26、arsort():对关联数组按照键值降序排列。
27、asort():对关联数组按照键值升序排列。
28、current():返回数组中的当前元素(第一个指针指向的元素)。
29、in_array('a',$arr):搜索数组中是否存在指定的值。
30、krsort():把数组按照键名降序排列。
31、ksort():把数组按照键名降升序序排列。
32、list():把数组中的值赋给一些变量。list($a,$b,$c) = array(1,2,3)。
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