基于元素内的数值按数字顺序排序数组[重复]

Question

This question already has an answer here:

• How can I sort arrays and data in PHP? 10 answers

How do you sort an array in numerical order, based on a numerical value within the element: where the element is a String?

for eg. from:

Array(
0 => One:3 
1 => Two:1
2 => Three:4
3 => Four:2
)

to:

Array(
    0 => Two:1
    1 => Four:2
    2 => One:3
    3 => Three:4
    )

</div>

Answer 1

Given your input array:

$arr = array('One:3','Two:1','Three:4','Four:2');
usort($arr, function($a, $b) {
  return filter_var($a, FILTER_SANITIZE_NUMBER_INT) - filter_var($b, FILTER_SANITIZE_NUMBER_INT);
});
print_r($arr);

outputs:

Array
(
    [0] => Two:1
    [1] => Four:2
    [2] => One:3
    [3] => Three:4
)