PHP automatically adds the http:// header and converts the URL into a link_PHP tutorial

Sometimes, when we need users to enter a URL, we usually ask the user to omit "http://". When the submission is completed, we use code to automatically add http:// if necessary. , we can also convert the URL into a link form, similar to the functions in many web page editors. The following code will implement this function. Let’s first look at the code that automatically adds the "http://" header:

PHP function code that automatically adds the "http://" header:

　1

　2if (!preg_match("/^(http|ftp):/", $_POST['url'])){

　3 $_POST['url'] = 'http://'.$_POST['url'];

　4}

　5?>

PHP converts URL strings into hyperlinks, and can convert URL and email address strings into clickable hyperlinks:

　01

　02function makeClickableLinks($text) {

　03 $text = eregi_replace('(((f|ht){1}tp://)[-a-zA-Z0-9@:%_+.~#?&//=]+) ',

　04 '1', $text);

　05 $text = eregi_replace('([[:space:]()[{}])(www.[-a-zA-Z0-9@:%_+.~#?&//=] +)',

　06 '12', $text);

　07 $text = eregi_replace('([_.0-9a-z-]+@([0-9a-z][0-9a-z-]+.)+[a-z]{2,3 })',

　08 '1', $text);

　09return $text;

　10}

　11?>

Combining these two pieces of code can form the following usage:

view sourceprint?1

　2$_POST['url']="www.codefans.net";

　3if (!preg_match("/^(http|ftp):/", $_POST['url'])) {

　4 $url = 'http://'.$_POST['url'];

　5}

　6echo makeClickableLinks($url);

7?>

The final effect is to add http:// to www.codefans.net and implement the link form.