What is the syntax and format for a PHP user-function call?

Question

I am new to using functions in PHP. I found (what appears to be) a good solution to a problem, using a user-defined function. The issue is, I do not know how to call it.
The function (http://www.jonasjohn.de/snippets/php/split-by-length.htm) is:
/**
* Splits the given string into chunks with the given length.
*
* @param string $string Input string
* @param string $chunkLength Chunk length
* @return array Splitted string
*/
function SplitByLength($string, $chunkLength=1){

$Result = array();
$Remainder = strlen($string) % $chunkLength;

$cycles = ((strlen($string) - $Remainder) / $chunkLength) + (($Remainder != 0) ? 1 : 0);

for ($x=0; $x < $cycles; $x++)
$Result[$x] = substr($string, ($x * $chunkLength), $chunkLength);

return $Result;
}

I tried:
call_user_func('SplitByLength($sub, $chunkLength=7)');

(($sub is the string I'm trying to cut into pieces by length!)

and

call_user_func('SplitByLength');

Neither work. If someone can explain what needs to be included in this particular function call, and more importantly WHY it needs to be called, that would be great.

Answer 1

How about



$chunkLength=7;



call_user_func('SplitByLength', $sub,$chunkLength );



or





$chunkLength=7;



$result = SplitByLength($sub,$chunkLength);

echo $result;

Answer 2

Unless you have a specific need for it's special features,

call_user_func is inappropriate for simple standard function usage.



I suggest you do a tutorial - http://www.tizag.com/phpT/phpfunctions.php .

In 5 minutes you will understand how to define and use a function better than I could explain it.

Answer 3

did you used