php function sort () How to implement array sorting _php tutorial

We are learningThe elements in a general array are represented by characters or numbers, so you can arrange the elements in ascending order, which is the sort () function. Like what:

 

  
 
       Php   
  
$ people = Array  (' name ', ' Sex ', ' nation ', ' birth '); 
  
foreach ($people as $mychrs)
  
echo $mychrs. " ";
  
Sort ($people);
  
echo "  <BR     />---sorted---<br    />"; 
  
foreach ($people as $mychrs)
  
echo $mychrs. " ";
  
?>  
 

The ascending sorted array elements are displayed as birth name Nation sex, of course, the PHP function sort () is case-sensitive (Letters from the largest to smallest order is: A ...). Z...A...Z)

The Sort () function also has a second argument that indicates whether the ascending rule is used to compare numbers or strings. Like what:

 

  
 
       Php   
  
echo "---sorted in ascending order of numbers---  <BR     />"; 
  
$ num2 = Array  (' 26 ', ' 3 ',); 
  
Sort ($num 2,sort_numeric);
  
foreach ($num 2 as $mychrs)
  
echo $mychrs. " ";
  

  
echo "  <BR    />---sorted by word Fu Shen---<br    />  "; 
  
$ num3 = Array  (' 26 ', ' 3 '); 
  
Sort ($num 3,sort_string);
  
foreach ($num 3 as $mychrs)
  
echo $mychrs. " ";
  
?>  
 

Sort_numeric and sort_string are used to declare in ascending order of numbers or characters. If the numbers are sorted in ascending order: 3, 26, but if ordered by word Fu Shen: 26, 3.

In addition to the ascending function in PHP, there are functions in descending or reverse order, that is, the PHP function sort (), for example:

 
  

  
   
$ NUM1 = Range (1,9);  
  
   

 
  

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