For loop in PHP: How to make a loop interval?

Question

I am trying to make a loop. Something like this:

I have 1000 records. Within this 1000 records it should take

first 200

then 201-400

then 401-600

then 600-800

then 801-1000

This is my code:

for($i=1; $i<=1000; $i++){
if($i > 200){
//$this->db->save(); //save some data
break;
}

echo $i."<br>";

if($i == 200){
  for($i=201; $i<=400; $i++) {
  //$this->db->save();  //save some data
  echo $i."<br>";
   }
}

if($i == 400) {
  for($i=401; $i<=600; $i++){
     echo $i."<br>";
   }
 }

Part 2:

$totalClientCount = 1000;      

$input_array    =    range(1, $totalClientCount);
$chunks         =    array_chunk($input_array, 200);

foreach ($chunks as $k => $chunk) { 

if ($k == 0) {  // 0-200
  $this->db->where('AccountNo', $id);
  //$this->db->limit($offset,$limit);
  $getClientDetails = $this->db->get('table');
  echo '<pre>';
  print_r($getClientDetails);    
}

This is where I am stuck. How do I execute this properly?

Instead of having a "main" loop with if-statements, why not simply have separate loops for the required ranges? — M. Eriksson
– M. Eriksson, Commented Apr 20, 2017 at 5:04

Indrasis Datta · Accepted Answer · 2017-04-20 05:02:03Z

3

You should be using array_chunk() here. Let me show an example with 100 entries, with first 20, 21-40, 41-60 and so on.

$input_array    =    range(1, 100);
$chunks         =    array_chunk($input_array, 20);

This is what $chunks array will look like:

Array
(
   [0] => Array
    (
        [0] => 1
        [1] => 2
        ......
        [9] => 10
     ),
  [1] => Array
    (
        [0] => 21
        [1] => 22
        .......
        [2] => 40
     )
     .........
     .........
   [4] => Array
      (
        [0] => 81
        [1] => 82
        ......
        [19] => 100 
   )

Now loop through your $chunks array.

foreach ($chunks as $k => $chunk) {
    /* $k = 0 means first 20 items */
    if ($k == 0) {
        // your code here
    }
    foreach ($chunk as $i) {
        echo $i;
        echo '<br/>';
    }
}

answered Apr 20, 2017 at 5:02

Indrasis Datta

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2 Comments

Mitukula Venkatesh Over a year ago

thank you for ur reply. But it should not go to another array until complete of first array[0]. i have test it is loading all at once 1000 records.just i need 0-200 and save some data, then array[1]

Mitukula Venkatesh Over a year ago

sorry for above comments.Its run perfectly what i was expecting thank you guys. @Object Manipulation,@Nishant Nair,@Anushil Nandan

Community · Accepted Answer · 2017-05-23 10:31:03Z

in case you are doing some task even after given range [200] you can use this:

$range = 200;
for($i=1; $i<=1000; $i++){
  //$this->db->save();
  if ($i%$range == 0) {
    //...
  }
}

basically here you are calling $this->db->save() every time till the end of loop and just using 201,401,601,801 to do something else, like printing current value of $i

in case you want to do separate tasks after every range:

$range = 200;
$fn = 0;
for($i=1; $i<=1000; $i++){
  $functionToCall = 'fn_'.$fn;
  $functionToCall();
  if ($i%$range == 0) {
    $fn = $i+1;
  }
}

function fn_0()
{
  //...
}

function fn_201()
{
  //...
}

function fn_401()
{
  //...
}

function fn_601()
{
  //...
}

function fn_801()
{
  //...
}

it's always a good practice to logically separate your functions.

Also if you have to just save 1000 times, do not use loop to insert. Try batch insert instead, something like insert multiple rows via a php array into mysql

Nishant Nair · Accepted Answer · 2017-04-20 05:02:48Z

0

you can use array_splice. If you need to send the array with specific interval its the best option.

I have implemented it in my code for sending notification for 1000 ids at a time.

$sendIds = array_splice($your_array,0,199);

answered Apr 20, 2017 at 5:02

Nishant Nair

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