PHP user name/mobile phone number/IP Address indicates positioning the asterisk display-PHP source code

When I was a beginner in php, I knew to use the replacement function to replace the specified number. But we need to simply replace the specified position. Below I will introduce several examples to show the asterisk. When I was a beginner in php, I knew to use the replacement function to replace the specified number. But we need to simply replace the specified position. Below I will introduce several examples to show the asterisk.

Script ec (2); script

Example: User Name

The Code is as follows:

Function cut_str ($ string, $ sublen, $ start = 0, $ code = 'utf-8 ') { If ($ code = 'utf-8 ') { $ Pa = "/[x01-x7f] | [xc2-xdf] [x80-xbf] | xe0 [xa0-xbf] [x80-xbf] | [xe1-xef] [x80-xbf] [x80-xbf] | xf0 [x90-xbf] [x80-xbf]] [x80-xbf] | [xf1-xf7] [x80-xbf] [x80-xbf] [x80-xbf]/"; Preg_match_all ($ pa, $ string, $ t_string ); If (count ($ t_string [0])-$ start> $ sublen) return join ('', array_slice ($ t_string [0], $ start, $ sublen )); Return join ('', array_slice ($ t_string [0], $ start, $ sublen )); } Else { $ Start = $ start * 2; $ Sublen = $ sublen * 2; $ Strlen = strlen ($ string ); $ Tmpstr = ''; www.111cn. Net For ($ I = 0; $ I <$ strlen; $ I ++) { If ($ I >=$ start & $ I <($ start + $ sublen )) { If (ord (substr ($ string, $ I, 1)> 129) { $ Tmpstr. = substr ($ string, $ I, 2 ); } Else { $ Tmpstr. = substr ($ string, $ I, 1 ); } } If (ord (substr ($ string, $ I, 1)> 129) $ I ++; } // If (strlen ($ tmpstr) <$ strlen) $ tmpstr. = "..."; Return $ tmpstr; } }

Example

The Code is as follows:
$ Str = "aliyun.com "; Echo cut_str ($ str, 1, 0). '**'. cut_str ($ str, 1,-1 ); // Output: for example, **

The following two IP addresses and mobile phone numbers are displayed with asterisks.

When I was a beginner in PHP, I saw someone else doing this by merging and splitting arrays! So turn it over !!

The Code is as follows:
$ Ip = $ _ SERVER ['remote _ ADDR ']; $ Ip_arr = explode ('.', $ ip ); $ Ip_arr [3] = '*'; $ Ip = implode ('.', $ ip_arr ); Echo $ ip; ?>

Mobile phone number

The Code is as follows:
$ Haoma = "15012345678 "; Echo preg_replace ("/(d {3}) d {5}/", "$1 *****", $ haoma ); // 150 ***** 678 ?>