2018-03-01 排序

sort()、asort()、ksort()小结

1.1 sort($array);
将数组$array内的元素升序排序
1.2 rsort($array);
将数组$array内的元素降序排序

• 例如：

";
print_r($cars);
print "

";

echo "sort()排序:
";
sort($cars);
print_r($cars);
print "
";
echo "rsort()排序:
";
rsort($cars);
print_r($cars);
print "

";
?>

结果

原数组:
Array ( [0] => Volvo [1] => BMW [2] => Toyota ) 

sort()排序:
Array ( [0] => BMW [1] => Toyota [2] => Volvo ) 
rsort()排序:
Array ( [0] => Volvo [1] => Toyota [2] => BMW ) 

2.1 asort($array);
将数组$array内的元素升序排序，并且不改变键(key)和值(value)的关系
2.2 arsort($array);
将数组$array内的元素降序排序，并且不改变键(key)和值(value)的关系

• 例如：

";
print_r($cars);
print "

";

echo "asort()排序:
";
asort($cars);
print_r($cars);
print "
";
echo "arsort()排序:
";
arsort($cars);
print_r($cars);
print "

";
?>

结果

原数组:
Array ( [0] => Volvo [1] => BMW [2] => Toyota ) 

asort()排序:
Array ( [1] => BMW [2] => Toyota [0] => Volvo ) 
arsort()排序:
Array ( [0] => Volvo [2] => Toyota [1] => BMW ) 

3.1 ksort($array);
将数组$array内的元素根据键名升序排序
3.2 krsort($array);
将数组$array内的元素根据键名降序排序

• 例如

";
print_r($cars);
print "

";

echo "ksort()排序:
";
ksort($cars);
print_r($cars);
print "
";
echo "krsort()排序:
";
krsort($cars);
print_r($cars);
print "
";
?>

结果

原数组:
Array ( [0] => Volvo [1] => BMW [2] => Toyota ) 

ksort()排序:
Array ( [0] => Volvo [1] => BMW [2] => Toyota ) 
krsort()排序:
Array ( [2] => Toyota [1] => BMW [0] => Volvo )