本文实例讲述了PHP针对中英文混合字符串长度判断及截取方法。分享给大家供大家参考,具体如下:
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/**
*
* 中英混合字符串长度判断
* @param unknown_type $str
* @param unknown_type $charset
*/
function strLength( $str , $charset = 'utf-8' ) {
if ( $charset == 'utf-8' )
$str = iconv ( 'utf-8' , 'gb2312' , $str );
$num = strlen ( $str );
$cnNum = 0;
for ( $i = 0; $i < $num ; $i ++) {
if (ord ( substr ( $str , $i + 1, 1 ) ) > 127) {
$cnNum ++;
$i ++;
}
}
$enNum = $num - ( $cnNum * 2);
$number = ( $enNum / 2) + $cnNum ;
return ceil ( $number );
}
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/**
*
* 中英混合的字符串截取
* @param unknown_type $sourcestr
* @param unknown_type $cutlength
*/
function cut_str( $sourcestr , $cutlength ) {
$returnstr = '' ;
$i = 0;
$n = 0;
$str_length = strlen ( $sourcestr ); //字符串的字节数
while ( ( $n < $cutlength ) and ( $i <= $str_length ) ) {
$temp_str = substr ( $sourcestr , $i , 1 );
$ascnum = Ord ( $temp_str ); //得到字符串中第$i位字符的ascii码
if ( $ascnum >= 224) //如果ASCII位高与224,
{
$returnstr = $returnstr . substr ( $sourcestr , $i , 3 ); //根据UTF-8编码规范,将3个连续的字符计为单个字符
$i = $i + 3; //实际Byte计为3
$n ++; //字串长度计1
} elseif ( $ascnum >= 192) //如果ASCII位高与192,
{
$returnstr = $returnstr . substr ( $sourcestr , $i , 2 ); //根据UTF-8编码规范,将2个连续的字符计为单个字符
$i = $i + 2; //实际Byte计为2
$n ++; //字串长度计1
} elseif ( $ascnum >= 65 && $ascnum <= 90) //如果是大写字母,
{
$returnstr = $returnstr . substr ( $sourcestr , $i , 1 );
$i = $i + 1; //实际的Byte数仍计1个
$n ++; //但考虑整体美观,大写字母计成一个高位字符
} else //其他情况下,包括小写字母和半角标点符号,
{
$returnstr = $returnstr . substr ( $sourcestr , $i , 1 );
$i = $i + 1; //实际的Byte数计1个
$n = $n + 0.5; //小写字母和半角标点等与半个高位字符宽...
}
}
if ( $str_length > $cutlength ) {
$returnstr = $returnstr . "..." ; //超过长度时在尾处加上省略号
}
return $returnstr ;
}
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希望本文所述对大家PHP程序设计有所帮助。