PHP Screen Filter The method of specifying keywords, php screen filter keyword _php Tutorial

PHP Screen Filter The method of specifying keywords, PHP screen filter keywords

The example in this article describes how PHP masks filter the specified keywords. Share to everyone for your reference. The specific analysis is as follows:

Implementation ideas:

First, the key words specifically written in a text file, each line one, the number of unlimited, how much write how much.
Second, PHP read the keyword text, stored in an array
Third, traverse the key word group, and then use the Strpos function to see if there are no keywords, if any, return true, no then return false

The PHP code is as follows:

Copy the Code Code as follows:/* filter keywords in PHP with strpos function */
Keyword Filter function
function Keywordcheck ($content) {
Remove whitespace
$content = Trim ($content);
Reading the keyword text
$content = @file_get_contents (' keyWords.txt ');
Convert an array
$arr = Explode ("n", $content);
Traverse detection
For ($i =0, $k =count ($arr), $i < $k; $i + +) {
If this array element is empty, skip this loop
if ($arr [$i]== ') {
Continue
}
If a keyword is detected, it returns a matching keyword and terminates the run
if (@strpos ($str, Trim ($arr [$i]))!==false) {
$i = $k;
return $arr [$i];
}
}
Returns False if no keyword is detected
return false;
}
$content = ' Here is the text content to be published ... ';
Filter keywords
$keyWord = Keywordcheck ($content);
Determine if a keyword exists
if ($keyWord) {
Echo ' Your post has keywords '. $keyWord;
}else{
Echo ' Congratulations! through keyword detection ';
The publish action can be completed by the write library operation down.
}

Example 2 (note: The keyword file used in Chinese keyword filtering is utf-8 encoded)

Copy the Code code as follows:/**
* Forbidden keyword Detection
*
* @param string $string to be detected
* @param string $fileName block the keyword file
* @return BOOL
*/
function Banwordcheck ($string, $fileName)
{
if (! ( $words = file_get_contents ($fileName))) {
Die (' file read error! ');
}
$string = Strtolower ($string);
$matched = Preg_match ('/'. $words. ' /I ', $string, $result);
if ($matched && isset ($result [0]) && strlen ($result [0]) > 0)
{
if (strlen ($result [0]) = = 2) {
$matched = Preg_match ('/'. $words. ' /iu ', $string, $result);
}
if ($matched && isset ($result [0]) && strlen ($result [0]) > 0) {
return true;
}else{
return false;
}
}else{
return false;
}
}
$content = ' Test keywords ';
if (Banwordcheck ($content, './banwords.txt ')) {
echo "matched!";
}else{
echo "No match!";
}

I hope this article is helpful to everyone's PHP programming.

I want to block some sensitive words through PHP code, write a broken code, always wrong

Determine whether a paragraph of text contains a string or some string, can be judged by Preg_match, for the message book or forum, you can determine whether to include some sensitive keywords, to decide whether to filter, whether to allow publishing

Use the symbol "|" between each sensitive word. Split, because in the regular inside "|" Equivalent to the meaning of "or"


$badkey = "sensitive words | Sensitive words b| sensitive words c";

$string = "I do not contain sensitive words, I want to publish";

if (Preg_match ("/$badkey/I", $string)) {

echo "Sorry, contains sensitive characters, not allowed to publish";

}else{

Do something ...

}

?>

And preg_replace can be used for keyword filtering (profanity filtering)

PHP can use Preg_replace to filter dirty words


$badstring = "tmd| | tnnd| her mother's ";
$string = "What the hell you say, her Niang, not human";
echo preg_replace ("/$badstring/I", "', $string);

?>


$allergicWord = Array (' Dirty word ', ' curse words ');

$str = ' This sentence contains foul language and curse words ';

for ($i =0; $i <>
$content = Substr_count ($str, $allergicWord [$i]);
if ($content >0) {
$info = $content;
Break
}
}

if ($info >0) {
There are illegal characters
return TRUE;
}else{
No illegal characters
return FALSE;
}
?>

How does PHP use to implement keyword blocking? You can also use JS or Ajax

Version:

Html>
Head>
/head>
Form action= "method=" Post "Name=" Form1 "
Input Name= "word" type= "text"/>
input Name= "" type= "Submit" onclick= "return Chkvalue ();" value= "Confirm"/
/form>
Script type= "Text/javascript",
function Chkvalue () {
var val = Document.form1.word.value,
array = ["ACD", "SVD", "FDG", "FDK"];
for (var i = array.length; i--;) {
if (Val.indexof (Array[i])!==-1) {
Alert (' has sensitive characters: ' + array[i]);
return false;
}
}
return true;
}
/script>
/html>

php version
? php

$content = "AFJVAHSV sjv Sdjavcvacvdjgfsacdaldkfja SFCJASLDFJ ";
$keyword = Array ("ACD", "SVD", "FDG", "FDK");
for ($i = count ($keyword); $i--;) {
if (Strpos ($content, $keyword [$i])!== false) {
echo "appears a sensitive character: {$keyword [$i]}"; exit ();
}
}

?

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