/ php

UTF-8編碼時擷取字串和計算長度的函數

資料轉貼自: Lukin zone

改寫討論區程式時剛好需要用到

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< ?php
// 支援中文的 substr(string,length[,start])
function cnsubstr($l1,$l2,$l3=0)
{
$I2 = "/[x01-x7f]|[xc2-xdf][x80-xbf]|xe0[xa0-xbf][x80-xbf]|[xe1-xef][x80-xbf][x80-xbf]|xf0[x90-xbf][x80-xbf][x80-xbf]|[xf1-xf7][x80-xbf][x80-xbf][x80-xbf]/";
preg_match_all($I2,$l1,$I3);
if (count($I3[0]) - $l3 > $l2) {
return implode('',array_slice($I3[0],$l3,$l2))."...";
}
return implode('',array_slice($I3[0],$l3,$l2));
}
 
// 計算中文字串長度
function len($l1)
{
$I2 = "/[x01-x7f]|[xc2-xdf][x80-xbf]|xe0[xa0-xbf][x80-xbf]|[xe1-xef][x80-xbf][x80-xbf]|xf0[x90-xbf][x80-xbf][x80-xbf]|[xf1-xf7][x80-xbf][x80-xbf][x80-xbf]/";
preg_match_all($I2,$l1,$I3);
return count($I3[0]);
}
?>