PHP-数组排序

$age=array("lili"=>"23","bob"=>"30","ben"=>"44");
$cars=array("volvo","bmw","toyota");

//对数组进行升序排列
sort($cars);
//格式化打印
print_r($cars,false);
//输出变量的内容、类型或者字符串的内容、类型、长度。常用来调试
var_dump($cars);
 
//结果
array (size=3)
  0 => string 'bmw' (length=3)
  1 => string 'toyota' (length=6)
  2 => string 'volvo' (length=5)

//降序排列
rsort($cars);
var_dump($cars);
 
 
//结果
array (size=3)
  0 => string 'volvo' (length=5)
  1 => string 'toyota' (length=6)
  2 => string 'bmw' (length=3)

asort($age);
var_dump($age);
 
echo "<hr/>";
 
 
//结果
array (size=3)
  'lili' => string '23' (length=2)
  'bob' => string '30' (length=2)
  'ben' => string '44' (length=2)

arsort($age);
var_dump($age);
 
echo "<hr/>";
 
//结果
array (size=3)
  'ben' => string '44' (length=2)
  'bob' => string '30' (length=2)
  'lili' => string '23' (length=2)

ksort($age);
var_dump($age);
 
//结果
array (size=3)
  'ben' => string '44' (length=2)
  'bob' => string '30' (length=2)
  'lili' => string '23' (length=2)

krsort($age);
var_dump($age);
 
//结果
array (size=3)
  'lili' => string '23' (length=2)
  'bob' => string '30' (length=2)
  'ben' => string '44' (length=2)