PHP correctly parses UTF-8 string_PHP tutorial

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The code is as follows

代码如下

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$str = '今天非常Happy，所有决定去KFC吃可乐鸡翅!!!'; /* $str 是待截取的字符串 $len 是截取的字符数 */ function utf8sub($str,$len) {  if($len <= 0){ return ''; } $offset = 0; // 截取高位字节时的偏移量 $chars = 0; // 截取到的字符数 $res = ''; // 存放截取的结果字符串 while($chars < $len){ // 先取字符串的第一个字节 // 将它转为十进制 // 再转为二进制 $high = ord(substr($str,$offset,1)); // echo '$high='. $high .' ';   if($high == null ){ // 如果取出高位为null，证明已经取到末尾，直接break    break;   }    if(($high>>2) === 0x3F){ // 将高位右移2位，和二进制111111比较，相同则取6个字节    // 截取2个字节    $count = 6;   }else if(($high>>3) === 0x1F){ // 将高位右移2位，和二进制11111比较，相同则取5个字节    // 截取3个字节    $count = 5;   }else if(($high>>4) === 0xF){ // 将高位右移2位，和二进制1111比较，相同则取4个字节      // 截取4个字节    $count = 4;   }else if(($high>>5) === 0x7){ // 将高位右移2位，和二进制111比较，相同则取3个字节       // 截取5个字节    $count = 3;   }else if(($high>>6) === 0x3){ // 将高位右移2位，和二进制11比较，相同则取2个字节    // 截取6个字节    $count = 2;   }else if(($high>>7) === 0x0){ // 将高位右移2位，和二进制0比较，相同则取1个字节    $count = 1;   }   // echo '$count='.$count.' ';      $res .= substr($str,$offset,$count); // 取出一个字符与$res字符串连接   $chars += 1;  // 截取到的字符数+1   $offset += $count;  // 截取高位偏移量向后移$count字节  }  return $res; } echo utf8sub($str,100);

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$str = 'Today is very happy, so we decided to go to KFC to eat Coke Chicken Wings!!!';

/*
$str is the string to be intercepted
$len is the number of characters intercepted
*/
function utf8sub($str,$len) {
if($len <= 0){
return '';
}

$offset = 0; // Offset when intercepting high-order bytes
$chars = 0; // Number of characters intercepted
$res = ''; // Store the intercepted result string

while($chars < $len){
//Get the first byte of the string first
//Convert it to decimal
//Convert to binary
$high = ord(substr($str,$offset,1));

// echo '$high='. $high .'
';

if($high == null ){ // If the high bit is null, it proves that it has been fetched to the end, break directly
break;
}
if(($high>>2) === 0x3F){ // Shift the high bit to the right by 2 bits and compare it with binary 111111. If it is the same, take 6 bytes
//Intercept 2 bytes
$count = 6;
}else if(($high>>3) === 0x1F){ // Shift the high bit to the right by 2 bits and compare it with binary 11111. If it is the same, take 5 bytes
// Intercept 3 bytes
$count = 5;
}else if(($high>>4) === 0xF){ // Shift the high bit to the right by 2 bits and compare it with binary 1111. If it is the same, take 4 bytes

//Intercept 4 bytes
$count = 4;
}else if(($high>>5) === 0x7){ // Shift the high bit to the right by 2 bits and compare it with binary 111. If it is the same, take 3 bytes

//Intercept 5 bytes
$count = 3;
}else if(($high>>6) === 0x3){ // Shift the high bit to the right by 2 bits, compare it with binary 11, if it is the same, take 2 bytes
//Intercept 6 bytes
$count = 2;
}else if(($high>>7) === 0x0){ // Shift the high bit to the right by 2 bits, compare it with binary 0, if it is the same, take 1 byte
$count = 1;
}
// echo '$count='.$count.'
';

$res .= substr($str,$offset,$count); // Take out a character and connect it to the $res string
$chars += 1; // Number of intercepted characters +1
$offset += $count; // Intercept the high offset and move it backward by $count bytes
}
return $res;
} echo utf8sub($str,100);

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truehttp: //www.bkjia.com/PHPjc/632169.htmlTechArticleFriends in need of PHP correctly parsing UTF-8 strings can refer to it. The code is as follows Copy the code $str = 'Today is very happy, so we decided to go to KFC to eat Coke chicken wings!!!'; /* $str is the word to be intercepted...