How to specify numbers between characters in percentage

How to specify numbers between characters in percentage 64.90 Hi!
53.64 Hi!
80.90 He Hao
53.64 Haha
40.90 Haha
53.64 Oh

For example, $ num is used to obtain the content of the above page.




How The number between two decimal places is equal to 80% of the original number.
The number between two decimal places is equal to 60% of the original number.



Retain other content on the original page, including text

Reply to discussion (solution)

$ S = <TXT
 
  
64.90
 Hi!
 
  
53.64
 Hi!
 
  
80.90
 He Hao
 
  
53.64
 Haha
 
  
40.90
 Haha
 
  
53.64
 TXT; echo preg_replace_callback ('/(
 
  
|
  
   
) ([\ D.] +)/', function ($ m) {return sprintf (' % s %. 2f ', $ m [1], $ m [2] * ($ m [1] ='
   
    
'? 0.8: 0.6) ;}, $ s );
   
  
 

 
  
51.92
 Hi!
 
  
32.18
 Hi!
 
  
64.72
 He Hao
 
  
32.18
 Haha
 
  
32.72
 Haha
 
  
32.18
 Oh

The code you gave me is incorrect.
Parse error: syntax error, unexpected T_FUNCTION in C: \ 111.php on line 10
Can I get the value equal to the variable? how can I write it?
$ P = preg_replace_callback ('/( | ) ([\ D.] +)/', function ($ m) {return sprintf (' % s %. 2f ', $ m [1], $ m [2] * ($ m [1] =' '? 0.8: 0.6) ;}, $ s );

Your php version earlier than 5.3 does not support anonymous functions.

function foo($m){     return sprintf('%s%.2f', $m[1], $m[2] * ($m[1] == '
 
  ' ? 0.8 : 0.6));}$p = preg_replace_callback('/(
  
   |
   
    )([\d.]+)/',  "foo", $s); echo $p;