php怎么检测字符串是否包含html代码

3. function has_html($string){

4. if(strlen($string) != strlen(strip_tags($string))){
5. return true;
6. }
7. return false;
8. }

9. var_dump(has_html("This string doesn't have any html"));

10. var_dump(has_html("This string has a
    line break"));

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