PHP substr Library Functions Introduction _php Tutorial

BeginnerThe following PHP substr library function program is not perfect, but the general Chinese (GB18030,GB2312,BIG5) is not a problem. 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 above code example is the specific use of PHP substr library functions when capturing Chinese characters.

http://www.bkjia.com/PHPjc/446214.html www.bkjia.com true http://www.bkjia.com/PHPjc/446214.html techarticle Beginners The following PHP substr library function program is not perfect, but the general Chinese (GB18030,GB2312,BIG5) is not a problem. This function is not suitable for utf-8 encoded text. $str characters ...

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