[SOLVED] substr() help

[mike1313]

I've read the documentation on php.net, but still dont full understand.

 

$string = '123456';

$return = substr("$string", 1);

echo "$return";

 

I know that $return will echo 23456.

 

But How can I for instance, using substr be able to echo 345, 456, 56?

 

Please any help is appreciated. Thanks.

[Orio]

This is what you need to keep in mind:

string substr ( string $string, int $start [, int $length] )

 

<?php

//345-
substr($string, 2, 3);

//456-
substr($string, 3, 3);

//56-
substr($string, 4, 2);

?>

 

 

Orio.

[mike1313]

Well say in a form, they input "123456 How are you?"

 

using substr how would I get rid of just 1 2 3 4 at each step?

 

I guess what I'm saying is it possible with an unknown str length?

[Orio]

You want to remove the first 4 characters?

 

<?php

substr($string, 0, 4);

?>

 

Maybe if you explain exactly what you want to do it would be easier to solve your problem.

 

Orio.

[mike1313]

This is jumbled but this is the code.

 

if($xy9 > "0" && $xy9 < "10") {
  $do_pm3 = substr("$do_pm2", 1);
  }
  elseif($xy9 > "10" && $xy9 < "100") {
  $do_pm3 = substr($do_pm2, 0, 2);
  }
  elseif($xy9 > "100" && $xy9 < "1000") {
  $do_pm3 = substr("$do_pm2", 0, 3);
  }
  elseif($xy9 > "1000" && $xy9 < "10000") {
  $do_pm3 = substr("$do_pm2", 0, 4);
  }

 

The only string returning anything is the first.

[Orio]

What are you trying to do?

 

Orio.

[mike1313]

$xy9 returns a number if that number is a certain number I need it to filter out the beginning of a string.

 

I tried using strlen instead of $xy9=100

 

I just need it to search for a number if its that number remove it from the string. or if strlen=2, 3, 4 I need to remove the 2nd, 3rd, 4th, characters of the string.

 

say strlen=2 I want substr to remove the 2 characters, 3, 4 and so on.