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PHP （20140523）

2024-07-05 20:03:10   218人阅读

sort();  升序

 对数组排序；

 1  1 <?php
 2  2 
 3  3 $fruits  = array( "lemon" ,  "orange" ,  "banana" ,  "apple" );
 4  4 sort ( $fruits );
 5  5 foreach ( $fruits  as  $key  =>  $val ) {
 6  6     echo  "fruits["  .  $key  .  "] = "  .  $val  .  "\n" ;
 7  7 }
 8  8 
 9  9 ?>
10 10 //输出结果
11 11 
12 12 fruits[0] = apple
13 13 fruits[1] = banana
14 14 fruits[2] = lemon
15 15 fruits[3] = orange

 

rsort();降序

-对数组逆向排序

此函数为 array 中的元素赋与新的键名。这将删除原有的键名，而不是仅仅将键名重新排序。

<?php
$fruits  = array( "lemon" ,  "orange" ,  "banana" ,  "apple" );
rsort ( $fruits );
foreach ( $fruits  as  $key  =>  $val ) {
    echo  " $key  =  $val \n" ;
}
?> 
//以上例程会输出：

0 = orange
1 = lemon
2 = banana
3 = apple

 

 

arsort();升序

对数组进行逆向排序并保持索引关系

 

 1 <?php
 2 $fruits  = array( "d"  =>  "lemon" ,  "a"  =>  "orange" ,  "b"  =>  "banana" ,  "c"  =>  "apple" );
 3 arsort ( $fruits );
 4 foreach ( $fruits  as  $key  =>  $val ) {
 5     echo  " $key  =  $val \n" ;
 6 }
 7 ?> 
 8 //以上例程会输出：
 9 
10 a = orange
11 d = lemon
12 b = banana
13 c = apple

 

asort();降序

对数组进行排序并保持索引关系；排值。

 1 <?php
 2 $fruits  = array( "d"  =>  "lemon" ,  "a"  =>  "orange" ,  "b"  =>  "banana" ,  "c"  =>  "apple" );
 3 asort ( $fruits );
 4 foreach ( $fruits  as  $key  =>  $val ) {
 5     echo  " $key  =  $val \n" ;
 6 }
 7 ?> 
 8 //以上例程会输出：
 9 
10 c = apple
11 b = banana
12 d = lemon
13 a = orange

 

ksort();升序

对数组按照键名排序。

 1 <?php
 2 $fruits  = array( "d" => "lemon" ,  "a" => "orange" ,  "b" => "banana" ,  "c" => "apple" );
 3 ksort ( $fruits );
 4 foreach ( $fruits  as  $key  =>  $val ) {
 5     echo  " $key  =  $val \n" ;
 6 }
 7 ?> 
 8 //以上例程会输出：
 9 
10 a = orange
11 b = banana
12 c = apple
13 d = lemon

 

krsort ();降序

 对数组按照键名逆向排序

 

 1 <?php
 2 $fruits  = array( "d" => "lemon" ,  "a" => "orange" ,  "b" => "banana" ,  "c" => "apple" );
 3 krsort ( $fruits );
 4 foreach ( $fruits  as  $key  =>  $val ) {
 5     echo  " $key  =  $val \n" ;
 6 }
 7 ?> 
 8 //以上例程会输出：
 9 
10 d = lemon
11 c = apple
12 b = banana
13 a = orange

 


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