工作中会经常分隔字符串为数组，我们可以用php内置函数str_split()，可是有时候字符串中包含中文，切割后会乱码，比如
print_r(str_split(‘dw氛围fesf‘,3));
输出
Array ( [0] => php [1] => ? [2] => ?? [3] => ?? [4] => ?? [5] => ?? [6] => ?!! [7] => ! )
为了能处理多字节字符串
下面函数可以实现
function mbStringToArray($str) {
if(empty($str)){
return false;
}
$len = mb_strlen($str);
$array = array();
for($i = 0; $i<$len; $i++) {
$array[] = mb_substr($str, $i, 1);
}
return $array;
}
/**
* @param str $str
* @param int $length 截取长度
* @param boole $byte 是否按字节分隔 false 按字符数分隔
* @return array
*/
function _str_split($str,$length,$byte=false){
if(mb_strwidth($str) == 1 || empty($str)){
return $str;
}
if($encoding = mb_detect_encoding($str, null, true) === false ){
return str_split($str, $length);
}
$utf8_str = mb_convert_encoding($str, ‘utf8‘, $encoding);
if($byte){
$line = ‘‘;
$split_arr = [];
foreach (preg_split(‘//u‘, $utf8_str,-1,PREG_SPLIT_NO_EMPTY ) as $char) {
$width = mb_strwidth($line.$char,‘utf8‘);
if($width <= $length){
$line .= $char;
continue;
}
$split_arr[] = str_pad($line, $width);
$line = $char;
}
return $split_arr;
}else{
$str_arr = mbStringToArray($str);
if($str_arr){
$chunk_index = 0;
$k_index = 0;
$line = ‘‘;
$chunks = [];
foreach ($str_arr as $key=>$val){
$line .= $val;
$chunks[$k_index] = $line;
if ($chunk_index++ == $length-1) {
$line = ‘‘;
$k_index++;
$chunk_index = 0;
}
}
}
return $chunks;
}
}
执行
print_r(_str_split($str,3,false));
输出
Array
(
[0] => php
[1] => 开发
[2] => 者中心
[3] => !!!
)
