Entry

How do create a function to process each letter of a comma separated string?

Jan 25th, 2001 20:11
Philip Olson, Aaron Sonnenshine,

Assuming a string exists such as this :
    $string = 'a,b,c';
Using explode() will be quite useful for this task.  Here's an example 
of running a function on each letter within the string :
<?php
    $string = 'a,b,c';
//  Turn the string into an array which will end up looking like this :
//    $array[0] = 'a';
//    $array[1] = 'b';
//    $array[2] = 'c';
//  Note : Within explode() ',' is seperating the $string by 
//  the comma ( , )
    $array = explode(',', $string);
//  Loop through each element in the array.  Foreach is great 
//  for looping.  The manual has alternatives (using while) for 
//  PHP3 users (foreach is php4+)
    foreach ($array as $key => $value) {
//  Recreate our array and use a function on each letter (value) 
//  in this example, strtoupper() will uppercase the value
        $array[$key] = strtoupper($value);
    }
//  Implode will turn the array back into a string and is 
//  used in similar fashion as explode.
    $string = implode(',', $array);
?>
That's one way to do it and yes this is a silly example.  The string 
now looks like this :
    $string = 'A,B,C';
Links to used and related resources :
    http://www.php.net/manual/en/function.explode.php
    http://www.php.net/manual/en/function.implode.php
    http://www.php.net/manual/en/control-structures.foreach.php
    http://www.php.net/manual/en/function.strtoupper.php
    http://www.php.net/manual/en/function.array.php