Question

我有一个看起来像这样的PHP数组...

array
(
[0] => apple,
[1] => orange,
[2} => ,
[3] => ,
)

我需要确保数组包含4个项目，因此在上面的实例中，我想以此结束...

# Utility function to convert string to list 
def toMutable(string): 
    temp = [] 
    for x in string: 
        temp.append(x) 
    return temp 

# Utility function to convert string to list 
def toString(List): 
    return ''.join(List) 

# Function to remove duplicates in a sorted array 
def removeDupsSorted(List): 
    res_ind = 1
    ip_ind = 1

    # In place removal of duplicate characters 
    while ip_ind != len(List): 
        if List[ip_ind] != List[ip_ind-1]: 
            List[res_ind] = List[ip_ind] 
            res_ind += 1
        ip_ind+=1

    # After above step string is efgkorskkorss. 
    # Removing extra kkorss after string 
    string = toString(List[0:res_ind]) 

    return string 

 # Function removes duplicate characters from the string 
 # This function work in-place and fills null characters 
 # in the extra space left 
 def removeDups(string): 
    # Convert string to list 
    List = toMutable(string) 

    # Sort the character list 
    List.sort() 

    # Remove duplicates from sorted 
    return removeDupsSorted(List) 

# Driver program to test the above functions 
string = "geeksforgeeks"
print removeDups(string)

我最好用一个计数器循环遍历并创建一个新数组，还是有更好的方法？

Answer 1

strtol()包含所需大小的元素的数组：

$my_arr = [1,2];
$my_arr = array_pad($my_arr, 4, '');

Answer 2

这应该做你想做的

$iNumberOfElements = 5;

$a = array('apple', 'orange');

if(count($a) < $iNumberOfElements){
    while (count($a) < $iNumberOfElements) {
        $a[] = "";
    }
}

var_dump($a);
exit;

Answer 3

@iainn所说：php.net/manual/en/function.array-pad.php

有这个功能：

$input = array(12, 10, 9);

$result = array_pad($input, 5, 0);
// result is array(12, 10, 9, 0, 0)

5是数组的大小，0是空单元格的默认值

PHP-确保数组具有一定数量的项目

3 个答案: