php man page for strtok

STRTOK(3)								 1								 STRTOK(3)

strtok - Tokenize string

SYNOPSIS
       string strtok (string  $str, string  $token)

DESCRIPTION
       string strtok (string  $token)

       strtok(3)  splits  a string ($str) into smaller strings (tokens), with each token being delimited by any character from $token. That is, if
       you have a string like "This is an example string" you could tokenize this string into its individual words by using the space character as
       the token.

	Note that only the first call to strtok uses the string argument. Every subsequent call to strtok only needs the token to use, as it keeps
       track of where it is in the current string. To start over, or to tokenize a new string you simply call  strtok  with  the  string  argument
       again  to  initialize  it.  Note  that you may put multiple tokens in the token parameter. The string will be tokenized when any one of the
       characters in the argument are found.

PARAMETERS
	      o $str
		- The string being split up into smaller strings (tokens).

	      o $token
		- The delimiter used when splitting up $str.

RETURN VALUES
	A string token.

EXAMPLES
       Example #1

	      strtok(3) example

	      <?php
	      $string = "This is	an example
string";
	      /* Use tab and newline as tokenizing characters as well  */
	      $tok = strtok($string, " 
	");

	      while ($tok !== false) {
		  echo "Word=$tok<br />";
		  $tok = strtok(" 
	");
	      }
	      ?>

	The behavior when an empty part was found changed with PHP 4.1.0. The old behavior returned an	empty  string,	while  the  new,  correct,
       behavior simply skips the part of the string:

       Example #2

	      Old strtok(3) behavior

	      <?php
	      $first_token  = strtok('/something', '/');
	      $second_token = strtok('/');
	      var_dump($first_token, $second_token);
	      ?>

	      The above example will output:

	      string(0) ""
		  string(9) "something"

       Example #3

	      New strtok(3) behavior

	      <?php
	      $first_token  = strtok('/something', '/');
	      $second_token = strtok('/');
	      var_dump($first_token, $second_token);
	      ?>

	      The above example will output:

	      string(9) "something"
		  bool(false)

NOTES
       Warning

	      This function may return Boolean FALSE, but may also return a non-Boolean value which evaluates to FALSE. Please read the section on
	      Booleans for more information. Use the === operator for testing the return value of this function.

SEE ALSO
       split(3), explode(3).

PHP Documentation Group 														 STRTOK(3)