replace word with using "sed" not work...

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LEARN ABOUT PHP

str_word_count

STR_WORD_COUNT(3)							 1							 STR_WORD_COUNT(3)

str_word_count - Return information about words used in a string

SYNOPSIS

       mixed str_word_count (string  $string, [int  $format], [string  $charlist])

DESCRIPTION

	Counts the number of words inside $string. If the optional $format is not specified, then the return value will be an integer representing
       the number of words found. In the event the $format is specified, the return value will be an array, content of which is dependent  on  the
       $format. The possible value for the $format and the resultant outputs are listed below.

	For the purpose of this function, 'word' is defined as a locale dependent string containing alphabetic characters, which also may contain,
       but not start with "'" and "-" characters.

PARAMETERS

	      o $string
		- The string

	      o $format
		- Specify the return value of this function. The current supported values are:

		     o 0 - returns the number of words found

		     o 1 - returns an array containing all the words found inside the $string

		     o 2 - returns an associative array, where the key is the numeric position of the word inside the $string and the value is the
		     actual word itself

	      o $charlist
		- A list of additional characters which will be considered as 'word'

RETURN VALUES

	Returns an array or an integer, depending on the $format chosen.

CHANGELOG

       +--------+--------------------------------+
       |Version |				 |
       |	|				 |
       |	|	   Description		 |
       |	|				 |
       +--------+--------------------------------+
       | 5.1.0	|				 |
       |	|				 |
       |	|  Added the $charlist parameter |
       |	|				 |
       +--------+--------------------------------+
EXAMPLES

       Example #1

	      A str_word_count(3) example

	      <?php

	      $str = "Hello fri3nd, you're
		     looking	      good today!";

	      print_r(str_word_count($str, 1));
	      print_r(str_word_count($str, 2));
	      print_r(str_word_count($str, 1, 'aaac3'));

	      echo str_word_count($str);

	      ?>

	      The above example will output:

	      Array
	      (
		  [0] => Hello
		  [1] => fri
		  [2] => nd
		  [3] => you're
		  [4] => looking
		  [5] => good
		  [6] => today
	      )

	      Array
	      (
		  [0] => Hello
		  [6] => fri
		  [10] => nd
		  [14] => you're
		  [29] => looking
		  [46] => good
		  [51] => today
	      )

	      Array
	      (
		  [0] => Hello
		  [1] => fri3nd
		  [2] => you're
		  [3] => looking
		  [4] => good
		  [5] => today
	      )

	      7

SEE ALSO

       explode(3), preg_split(3), split(3), count_chars(3), substr_count(3).

PHP Documentation Group 													 STR_WORD_COUNT(3)

Shell Programming and Scripting