qr code scanner for java mobile 1: Working with Strings in .NET framework

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1: Working with Strings
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You can combine the elements of an array into a comma-separated string list the reverse of the listing above with PHP s implode() function
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112 Parsing URLs
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Problem
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You want to extract the protocol, domain name, path, or other significant component of a URL
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Use the parse_url() function to automatically split the URL into its constituent parts:
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< php // define URL $url = "http://wwwmelonfirecom:80/community/columns/trog/ articlephp id=79 &page=2"; // parse URL into associative array $data = parse_url($url); // print URL components foreach ($data as $k=>$v) { echo "$k: $v \n"; } >
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Comments
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The parse_url() function is one of PHP s more useful URL manipulation functions Pass it a Uniform Resource Locator (URL), and parse_url() will go to work splitting it into its individual components The resulting associative array contains separate keys for the protocol, host name, port number, remote path, and GET arguments You can then easily access and use these keys for further processing for example, the variable $data['host'] will return the value wwwmelonfirecom
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PHP Programming Solutions
Consider the output of the previous script, which illustrates this:
scheme: http host: wwwmelonfirecom port: 80 path: /community/columns/trog/articlephp query: id=79&page=2
113 Counting Words in a String
Problem
You want to count the number of words in a sentence or paragraph
Solution
Use a pattern to identify the individual words in the string, and then count how many times that pattern recurs:
< php // define string $text = "Fans of the 1980 group will have little trouble recognizing the group's distinctive synthesized sounds and hypnotic dance beats, since these two elements are present in almost every song on the album; however, the lack of diversity and range is troubling, and I'm hoping we see some new influences in the next album More intelligent lyrics might also help"; // decompose the string into an array of "words" $words = preg_split('/[^0-9A-Za-z\']+/', $text, -1, PREG_SPLIT_NO_EMPTY); // count number of words (elements) in array // result: "59 words" echo count($words) " words"; >
Comments
The preg_split() function is probably one of PHP s most underappreciated functions This function accepts a Perl-compliant regular expression and a subject
1: Working with Strings
string, and returns an array containing substrings matching the pattern It s a great way of finding the matches in a string and placing them in a separate array for further processing Read more about the function and its arguments at http://wwwphp net/preg_split In this listing, the regular expression [^0-9A-Za-z\']+ is a generic pattern that will match any word All the words thus matched are fed into the $words array Counting the number of words in the string is then simply a matter of obtaining the size of the $words array An alternative is to use the new str_word_count() function to perform this task Here s an example:
< php // define string $text = "Fans of the 1980 group will have little trouble recognizing the group's distinctive synthesized sounds and hypnotic dance beats, since these two elements are present in almost every song on the album; however, the lack of diversity and range is troubling, and I'm hoping we see some new influences in the next album More intelligent lyrics might also help"; // count number of words // result: "58 words" $numWords = str_word_count($text); echo $numWords " words"; >
NOTE
Wondering about the discrepancy in the results above The str_word_count() function ignores numeric strings when calculating the number of words
114 Spell-Checking Words in a String
Problem
You want to check if one or more words are spelled correctly
PHP Programming Solutions
Solution
Use PHP s ext/pspell extension to check words against an internal dictionary:
< php // define string to be spell-checked $str = "someun pleez helpp me i canot spel"; // check spelling // open dictionary link $dict = pspell_new("en", "british"); // decompose string into individual words // check spelling of each word $str = preg_replace('/[0-9]+/', '', $str); $words = preg_split('/[^0-9A-Za-z\']+/', $str, -1, PREG_SPLIT_NO_EMPTY); foreach ($words as $w) { if (!pspell_check($dict, $w)) { $errors[] = $w; } } // if errors exist // print error list if (sizeof($errors) > 0) { echo "The following words were wrongly spelt: " implode(" ", $errors); } >
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