PHP array _5_3_ array and its application handler array permutation function _7_

The following is learning Kong Xiangsheng editor of "PHP Programming Fundamentals tutorial and example" (second edition) notes made.

 

Array permutation function

1. sort () function

program:

1 <?php
2 $array = array("img12.gif","img10.gif","img2.gif","img1.gif");
3 sort($array);
4 print_r($array);    
5 //Array ( [0] => img1.gif [1] => img10.gif [2] => img12.gif [3] => img2.gif )
6 ?>

Output:

Array ( [0] => img1.gif [1] => img10.gif [2] => img12.gif [3] => img2.gif )

 

2. asort () function

program:

1 <?php
2 $array = array("img12.gif","img10.gif","img2.gif","img1.gif");
3 asort($array);
4 print_r($array);
5 //Array ( [3] => img1.gif [1] => img10.gif [0] => img12.gif [2] => img2.gif )
6 ?>

Output:

Array ( [3] => img1.gif [1] => img10.gif [0] => img12.gif [2] => img2.gif )

 

3. rsort () function and arsort () function

program:

 1 <?php
 2 $array1 = $array2 = array("img12.gif","img10.gif","img2.gif","img1.gif");
 3 rsort($array1);
 4 print_r($array1);
 5 //Array ( [0] => img2.gif [1] => img12.gif [2] => img10.gif [3] => img1.gif )
 6 echo "<br/>";
 7 arsort($array2);
 8 print_r($array2);
 9 //Array ( [2] => img2.gif [0] => img12.gif [1] => img10.gif [3] => img1.gif )
10 ?>

Output:

Array ( [0] => img2.gif [1] => img12.gif [2] => img10.gif [3] => img1.gif ) 
Array ( [2] => img2.gif [0] => img12.gif [1] => img10.gif [3] => img1.gif )

 

4. ksort () function

program:

1 <?php
2 $array1 = array( "c"=>"China","f"=>"French","e"=>"English" );
3 ksort($array1);
4 print_r($array1);
5 //Array ( [c] => China [e] => English [f] => French )
6 ?>

Output:

Array ( [c] => China [e] => English [f] => French )

 

5. krsort () function

program:

1 <?php
2 $array1 = array( "c"=>"China","f"=>"French","e"=>"English" );
3 krsort($array1);
4 print_r($array1);
5 //Array ( [f] => French [e] => English [c] => China )
6 ?>

Output:

Array ( [f] => French [e] => English [c] => China )

 

6. natsort () function

program:

1 <?php
2 $array = array("A12","a10","a2","A1");
3 natsort($array);　　//区分大小写
4 print_r($array);
5 //Array ( [3] => A1 [0] => A12 [2] => a2 [1] => a10 )
6 ?>

Output:

Array ( [3] => A1 [0] => A12 [2] => a2 [1] => a10 )

 

7. natcasesort () function

program:

1 <?php
2 $array = array("A12","a10","a2","A1");
3 natcasesort($array);    //不区分大小写
4 print_r($array);
5 //Array ( [3] => A1 [2] => a2 [1] => a10 [0] => A12 )
6 ?>

Output:

Array ( [3] => A1 [2] => a2 [1] => a10 [0] => A12 )

 

8. shuffle () function

program:

1 <?php
2 $array = array("A12","a10","a2","A1");
3 shuffle($array);
4 print_r($array);    //Array ( [0] => a10 [1] => a2 [2] => A1 [3] => A12 ) 
5 echo "<br/>";
6 shuffle($array);
7 print_r($array);    //Array ( [0] => A1 [1] => a10 [2] => a2 [3] => A12 ) 
8 echo "<br/>";
9 ?>

Output:

Array ( [0] => a10 [1] => a2 [2] => A1 [3] => A12 ) 
Array ( [0] => A1 [1] => a10 [2] => a2 [3] => A12 ) 

 

9. array_reverse () function

program:

1 <?php
2 $array = array("a12","a1","a2","a10");
3 $newArray1 = array_reverse($array);
4 print_r($newArray1);    //Array ( [0] => a10 [1] => a2 [2] => a1 [3] => a12 )
5 echo "<br/>";
6 $newArray2 = array_reverse($array,TRUE);
7 print_r($newArray2);    //Array ( [3] => a10 [2] => a2 [1] => a1 [0] => a12 ) 
8 echo "<br/>";
9 ?>

Output:

Array ( [0] => a10 [1] => a2 [2] => a1 [3] => a12 ) 
Array ( [3] => a10 [2] => a2 [1] => a1 [0] => a12 )