How to filter ascii control characters in php_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.

　/**

* 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/814671.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/814671.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...