Thursday, April 9, 2015

Filter spam words in a string - PHP snippet

Filter spam words in a string - php snippet

This php snippet check if a string contain spam words contained in text file and filter them.
function is_spam($text, $file, $split = ':', $regex = false){ 
$handle = fopen($file, 'rb');
$contents = fread($handle, filesize($file));
$lines = explode("\n", $contents);
$arr = array();
foreach($lines as $line){
list($word, $count) = explode($split, $line);
$arr[$word] = $count;
$arr[preg_quote($word)] = $count;
preg_match_all("~".implode('|', array_keys($arr))."~", $text, $matches);
$temp = array();
foreach($matches[0] as $match){
if(!in_array($match, $temp)){
$temp[$match] = $temp[$match] + 1;
if($temp[$match] >= $arr[$word])
return true;
return false;

$file = 'spam.txt';
$str = 'This string has the word viagra and sex get viagra see viagra';
if(is_spam($str, $file))
echo 'this is spam';
echo 'this is not spam';
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