Go4Expert - Methods to iterate through an array

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Methods to iterate through an array

I was wondering in how many ways can we iterate through an array in PHP. So, I figured out a few, here's it...

Our Array, which we will be iterating on,

PHP Code:


		
			
$arr = array('PHP','Perl', 'JavaScript','AJAX', 'Python','ASP', 'C#');

1. Using a simple for loop

PHP Code:


		
			
// using for loop

 for($i=0;$i<count($arr);$i++)

 {

     print("$arr[$i]\n");

 }

2. Using foreach

PHP Code:


		
			
// using foreach

 foreach($arr as $val)

 {

     print("$val\n");

 }

3. Using a while loop

Code: PHP

// using while loop
 $i=0;
 while($val=$arr[$i++])
 {
     print("$val\n");
 }

4. Using the array_walk function

PHP Code:


		
			
// using array_walk function

 function print_item($item,$key)

 {

     print("$item\n");

 }

 

 array_walk($arr,'print_item');

5. Using an user function

PHP Code:


		
			
// using a function, and recursively calling it

 function print_recurse(&$a)

 {

     printf("%s\n",array_pop($a));

     print_recurse($a);

 }

 

 print_recurse($arr)

Re: Methods to iterate through an array

Sorry for the bug which I overlooked, the function will run into infinite recursion, so the correct one should look like this.

PHP Code:


		
			
 // using a function, and recursively calling it

function print_recurse(&$a)

{

    printf("%s\n",array_pop($a));

    // check whether array has any elements, or else it'll become an infinite recursion

    if(count($a)>0)

        print_recurse($a);

}



print_recurse($arr);