PHP Tips: Filtering ASCII Control Characters_PHP Tutorial

I still remember that at work, I imported data from other websites to xml. But you will encounter a problem: the web page will have asciII control characters. At first, I thought it was added by someone else to prevent collection. Then I found one and added it to the filtering list. Until I slowly discovered that they are all characters in the ascii table. Once you find the cause, it will be easy to solve.

Copy code The code is as follows:

/**
* Filter control characters according to ascii code
* @param type $string
*/
public static function special_filter($string )
{
if(!$string) return '';

$new_string = '';
for($i =0; isset($string[$i]); $i++)
{
$asc_code = ord($string[$i]); //Get its asc code

//The following code is designed to filter illegal characters
if($ asc_code == 9 || $asc_code == 10 || $asc_code == 13){
$new_string .= ' ';
}
else if($asc_code > 31 && $asc_code != 127){
$new_string .= $string[$i];
}
}

return trim($new_string);
}

http://www.bkjia.com/PHPjc/770091.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/770091.htmlTechArticleI still remember that at work, I imported data from other websites to xml. But you will encounter a problem: the web page will have asciII control characters. At first I thought it was someone else trying to prevent picking...