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In order for this listing to work, PHP must be compiled with support for the pspell extension (You can obtain instructions from the PHP manual at http://wwwphpnet/pspell)
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The first task here is to identify the individual words in the sentence or paragraph You accomplish this using the preg_split() function and regular expression previously discussed in the listing in the 113: Counting Words in a String section The pspell_new() function is used to open a link to the appropriate language dictionary, and the pspell_check() function iterates over the word list, checking each word
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1: Working with Strings
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against the dictionary For words that are incorrectly spelled, pspell_check() returns false; these words are flagged, placed in an array and displayed in a list once the process is complete With a little modification, you can have the previous listing check a file (rather than a variable) for misspelled words, and even offer suggestions when it encounters errors Consider this variant, which illustrates the process and incorporates a call to pspell_suggest() to recommend alternatives for each wrongly-spelled word:
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< php // define file to be spell-checked $file = "badspellingtxt"; // check spelling // open dictionary link $dict = pspell_new("en", "british", "", "", PSPELL_FAST); // open file $fp = fopen ($file, 'r') or die ("Cannot open file $file"); // read file line by line $lineCount = 1; while ($line = fgets($fp, 2048)) { // clean up trailing whitespace $line = trim($line); // decompose line into individual words // check spelling of each word $line = preg_replace('/[0-9]+/', '', $line); $words = preg_split('/[^0-9A-Za-z\']+/', $line, -1, PREG_SPLIT_NO_EMPTY); foreach ($words as $w) { if (!pspell_check($dict, $w)) { if (!is_array($errors[$lineCount])) { $errors[$lineCount] = array(); } array_push($errors[$lineCount], $w); } } $lineCount++; }
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// close file fclose($fp); // if errors exist if (sizeof($errors) > 0) { // print error list, with suggested alternatives echo "The following words were wrongly spelt: \n"; foreach ($errors as $k => $v) { echo "Line $k: \n"; foreach ($v as $word) { $opts = pspell_suggest($dict, $word); echo "\t$word (" implode(', ', $opts) ")\n"; } } } >
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It s important to remember that pspell_check() returns false on numeric strings This can result in numerous false positives if your string contains numbers by themselves The previous listing works around this problem by removing all the number sequences from the string/file before passing it to pspell_check()
115 Identifying Duplicate Words in a String
Problem
You want to identify words that appear more than once in a string
Solution
Decompose the string into individual words, and then count the occurrences of each word:
< php // define string $str = "baa baa black sheep"; // trim the whitespace at the ends of the string $str = trim($str);
1: Working with Strings
// compress the whitespace in the middle of the string $str = ereg_replace('[[:space:]]+', ' ', $str); // decompose the string into an array of "words" $words = explode(' ', $str); // iterate over the array // count occurrences of each word // save stats to another array foreach ($words as $w) { $wordStats[strtolower($w)]++; } // print all duplicate words // result: "baa" foreach ($wordStats as $k=>$v) { if ($v >= 2) { print "$k \r\n"; } } >
Comments
The first task here is to identify the individual words in the sentence or paragraph You accomplish this by compressing multiple spaces in the string, and then decomposing the sentence into words with explode(), using a single space as [the] delimiter Next, a new associative array, $wordStats, is initialized and a key is created within it for every word in the original string If a word occurs more than once, the value corresponding to that word s key in the $wordStats array is incremented by 1 Once all the words in the string have been processed, the $wordStats array will contain a list of unique words from the original string, together with a number indicating each word s frequency It is now a simple matter to isolate those keys with values greater than 1, and print the corresponding words as a list of duplicates
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