PHP/String/preg split

Calculating average word length

   <source lang="html4strict">

<?php $word_count = $word_length = 0; if ($fh = fopen("novel.txt","r")) {

 while (! feof($fh)) {
   if ($s = fgets($fh)) {
     $words = preg_split("/\s+/",$s,-1,PREG_SPLIT_NO_EMPTY);
     foreach ($words as $word) {
       $word_count++;
       $word_length += strlen($word);
     }
   }
 }

} print sprintf("The average word length over %d words is %.02f characters.",

             $word_count,
             $word_length/$word_count);

?>

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Discarding empty elements with preg_split()

   <source lang="html4strict">

<? $text=<<<TEXT "asdf.asdf,asdf!asdf TEXT; $words = preg_split("/[",.!\s]/", $text, -1, PREG_SPLIT_NO_EMPTY); print "There are " . count($words) ." words in the text."; ?>

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How preg_split() can be used:

   <source lang="html4strict">

<?php

   $s = "a , bc ,asdf";
   var_dump (preg_split ("/[ ,]/", $s));

?>

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Limiting the number of returned elements with preg_split()

   <source lang="html4strict">

<? $sea_creatures = "A;B, C,D, E; F"; $creature_list = preg_split("/, ?/",$sea_creatures, 3); print "The last element is $creature_list[2]"; ?>

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Parsing a date with preg_split()

   <source lang="html4strict">

<?php $ar = preg_split("/[- :]/",$date); var_dump($ar); ?>

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preg_split() Flags

   <source lang="html4strict">

Reference Number Value

PREG_SPLIT_NO_EMPTY Causes empty substrings to be discarded.

PREG_SPLIT_DELIM_CAPTURE Causes any references inside pattern to be captured and returned as part of the function"s output.

PREG_SPLIT_OFFSET_CAPTURE Causes the position of each substring to be returned as part of the function"s output (similar to PREG_OFFSET_CAPTURE in preg_match()).

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preg_split() function operates like split(), except that regular expressions are accepted as input parameters for pattern.

   <source lang="html4strict">

Its syntax is: array preg_split (string pattern, string string [, int limit [, int flags]]) If limit is specified, then only limit number of substrings are returned.

<? $user_info = "+J+++G+++++w"; $fields = preg_split("/\+{1,}/", $user_info); while ($x < sizeof($fields)) :

  print $fields[$x]. "
";
  $x++;

endwhile; ?>

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preg_split.php

   <source lang="html4strict">

<?php

  $delimitedText = "+A+++G+++++++++++C";
  $fields = preg_split("/\+{1,}/", $delimitedText);
   foreach($fields as $field) echo $field."
";

?>

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Using preg_split()

   <source lang="html4strict">

<? $sea_creatures = "A;B, C,D, E; F"; $creature_list = preg_split("/[,;] ?/",$sea_creatures); print "Would you like some $creature_list[2]?"; ?>

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Using preg_split() to Break Up Strings

   <source lang="html4strict">

<? $text = "a, o, p"; $fruitarray = preg_split( "/, | and /", $text );

print "

\n";
print_r( $fruitarray );
print "

\n";

?>

 </source>