Function introduction of PHP Substr Library

BeginnerThe following PHP Substr library function program is not perfect, but it is no problem to process General Chinese (GB18030, GB2312, BIG5. This function is not suitable for UTF-8 encoded text.

 
 

  
  
// $ Str string
  
  
// $ Max maximum number of characters
  
  
Function Substring ($ str, $ max ){
  
  
$ Cnt = 0; // actual count
  
  
$ Index = 0; // current index
  
  
$ Output = ''; // output
  
  
//
  
  
While ($ cnt <$ max & $ index <strlen ($ str )){
  
  
$ Output. = $ str [$ index];
  
  
// Big5
  
  
If (ord ($ str [$ index])> = 0x81 &&
Ord ($ str [$ index]) <= 0xfe ){
  
  
If ($ index + 1 <strlen ($ str )){
  
  
If (ord ($ str [$ index + 1])> = 0x40
& Ord ($ str [$ index + 1]) <0x7e)
  
  
| (Ord ($ str [$ index + 1])> = 0xa1
& Ord ($ str [$ index + 1]) <= 0xfe )){
  
  
$ Index ++;
  
  
$ Output. = $ str [$ index];
  
  
}
  
  
}
  
  
}
  
  
// Gb2312
  
  
Else if (ord ($ str [$ index])> = 0xa1
& Ord ($ str [$ index]) <= 0xf7 ){
  
  
$ Output. = $ str [$ index];
  
  
If ($ index + 1 <strlen ($ str )){
  
  
If (ord ($ str [$ index + 1])> = 0xa1
& Ord ($ str [$ index + 1]) <0xfe ){
  
  
$ Index ++;
  
  
$ Output. = $ str [$ index];
  
  
}
  
  
}
  
  
}
  
  
Else {
  
  
}
  
  
$ Cnt ++;
  
  
$ Index ++;
  
  
}
  
  
Return $ output;
  
  
}
 
 

The preceding code example shows how to use the PHP Substr library function to intercept Chinese characters.