extracting from string

[applewilliam]

Hello,

 

I have a string that looks like this :  hj45ederl840lmcjower oldwsd3ohwxrzswlzswd

 

I want to extract every 3 characters (even if it is a space).  So it should read: hello world.

 

any advice?

[ChemicalBliss]

The easiest method is a recurring substr function:

 

use a while() loop eg:

 

<?php
$cstring = "hj45ederl840lmcjower oldwsd3ohwxrzswlzswd";
$new_string = substr($cstring,0,1);  // Gets the first letter.
$cstring = substr($cstring,1); // Removes First letter from current string.

while($more_left == true){ // While there is more to do, continue the loop.
   
   // If there is at least 4 characters left (3 to skips and 1 to add), then do this.
   if(strlen($cstring) >= 4){
      $new_string .= substr($cstring,3,1); // Add the fourth letter (skip 3 letters)
      $cstring = substr($cstring,4); // Get rid of that last part so we can continue with the next letter.
   }else{
      $more_left = false; // If there arent enough characters to skip then there must be no characters to save, so break the loop.
   }
}

echo($new_string);
// Untested.

?>

 

That should work. substr is extremely useful.

 

Hope this Helps,

-CB-

[Buddski]

Its not perfect but it works

$str = 'hj45ederl840lmcjower oldwsd3ohwxrzswlzswd';
for($i=0;$i<strlen($str);$i+=4) {
echo $str{$i};
}

[applewilliam]

Its not perfect but it works

$str = 'hj45ederl840lmcjower oldwsd3ohwxrzswlzswd';
for($i=0;$i<strlen($str);$i+=4) {
echo $str{$i};
}

 

Ok if the string needs to be extracted every 2 letters.  How do I make a variable for this $i+=4.  That can be set

[ChemicalBliss]

You change the number 4 into a variable, and set it earlier in the script.

[applewilliam]

You change the number 4 into a variable, and set it earlier in the script.

 

Yea i got it thanks

[.josh]

$string = "hj45ederl840lmcjower oldwsd3ohwxrzswlzswd";
preg_match_all('~(.)(.{3})?~',$string,$chars);

// example output
echo "<pre>"; print_r($chars[1]);

[printf]

Using preg_replace, It returns only want you want.

 

<?php

$text = 'hj45ederl840lmcjower oldwsd3ohwxrzswlzswd';

echo preg_replace ( "~(.){1}.{3}~", "\\1", $text );

?>