How does PHP stitch binary data into strings?

Binary PHP utf-8 encoding

For example, the character "You" of the UTF8 code is "e4bda0".
Now there is an array of $arr

$arr = Array (chr (228), Chr (189), Chr (160));

How do you stitch it up into a piece that allows it to print out the characters "you"?
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Reply to discussion (solution)

$arr = Array (chr (228), Chr (189), CHR), echo join ("', $arr); Your foreach ($arr as $v) echo $v; for ($i =0; $i
   
  
  
  
  
  
Echo Pack (' h* ', ' e4bda0 '); Echo hex2bin (' e4bda0 ');
 
  
 
  
  

  
$arr = Array (chr (228), Chr (189), CHR), echo join ("', $arr); Your foreach ($arr as $v) echo $v; for ($i =0; $i
   
     
     
 
     
 
     
echo Pack (' h* ', ' e4bda0 '); echo  
 Hex2bin (' e4bda0 '); 
 
     
 Thank you ~ The following two are possible ~ 
     
 It is strange that I used to print a join yesterday is three characters ~ today even join available ~ 
     
 Just don't know how join performance ~ 
     
 
 
     
 J Oin in the internal loop, certainly more than you do in the code loop to do the fast 
 
     
 join in the internal loop, certainly more than you do in the code loop to do the fast 
 I was in the improvement of a template engine, before the two posts asked the regular expression matching mark  Sign of the question ~ did not 
 helpless, I decided to write a parser ~ Unfortunately PHP does not support pointers and memory copy and other high-performance things, do not know how to get the performance of this method to lose how much ~ 
 
     
 Not because of "worry" and timid  
 Performance is compared, you have to do a few more programs.  
 There are comparisons to be identified! 
 
 PHP is interpreted as executing, and each instruction takes a bit of time to 
 Cycle as well as more time. 
 Recursion is also the loop 
 Recognition mode, the string function loop is better than regular 
 can use an iterator to not loop itself 
 ... 
  
     
 Not because of "worry" and timid 
 performance is compared, you have to do a few more programs.  
 There are comparisons to be identified! 
 
 PHP is interpreted as executing, and each instruction takes a bit of time to 
 Cycle as well as more time.  Recursion is also the loop 
 Recognition mode, the string function loop is better than regular 
 can use an iterator to not loop itself 
 ...
 
 Thank you ~ Thank you ~ 
 
     
 