PHP array index and key operation Skill example Analysis _php skill

This article describes the PHP array index and key manipulation techniques. Share to everyone for your reference. Specifically as follows:

<?php 
$array = Array ("A", "B", "C");//define array 
$array [] = "Simon";//Add a new array element 
Print_r ($array);//output array 
?> 

<?php 
$array = Array ("A", "B", "C");//define Array 
$array [9] = "Simon";//Add a new array element 
Print_r ($array);//output array 
?> 

<?php 
//Create a simple array 
$array = Array (0=>1, 1=>2, 2=>3, 3=>4, 6=>5); 
Print_r ($array); 
Now update the value of the key in the array to 2 
$array [2] = m; 
Print_r ($array); 
Now add a key 
$array ["X"] = m; 
Print_r ($array); 
Delete all keys now, but keep the structure of the array itself 
foreach ($array as $i => $value)  
{ 
  unset ($array [$i]); 
} 
Print_r ($array); 
Add a key 
$array [] =; 
Print_r ($array); 
Re-indexing using the Array_values function 
$array = array_values ($array); 
$array [] =; 
Print_r ($array); 
? >

I hope this article will help you with your PHP program design.