php截取字符串函数分享,php截取字符串
经常看到有新手问PHP有没有类似asp的left函数或right函数,实现截取某字符串左边或右边开始N个字符的函数。答案当然是有的。PHP中的substr函数就可以做的到,只不过PHP把二个函数合二为一了,这里再给大家分享一个更加优秀的截取字符串的函数。
复制代码 代码如下:
/**
* 方法库-截取字符串-【该函数作者未知】
* @param string $string 字符串
* @param int $length 字符长度
* @param string $dot 截取后是否添加...
* @param string $charset编码
* @return string
*/
public function cutstr($string, $length, $dot = ' ...', $charset = 'utf-8') {
if (strlen($string)
return $string;
}
$string = str_replace(array('&', '"', ''), array('&', '"', ''), $string);
$strcut = '';
if (strtolower($charset) == 'utf-8') {
$n = $tn = $noc = 0;
while ($n
$t = ord($string[$n]); //ASCIIֵ
if($t == 9 || $t == 10 || (32
$tn = 1; $n++; $noc++;
} elseif (194
$tn = 2; $n += 2; $noc += 2;
} elseif (224
$tn = 3; $n += 3; $noc += 2;
} elseif (240
$tn = 4; $n += 4; $noc += 2;
} elseif (248
$tn = 5; $n += 5; $noc += 2;
} elseif ($t == 252 || $t == 253) {
$tn = 6; $n += 6; $noc += 2;
} else {
$n++;
}
if($noc >= $length) {
break;
}
}
if ($noc > $length) {
$n -= $tn;
}
$strcut = substr($string, 0, $n);
} else {
for ($i = 0; $i
$strcut .= ord($string[$i]) > 127 ? $string[$i].$string[++$i] : $string[$i];
}
}
$strcut = str_replace(array('&', '"', ''), array('&', '"', ''), $strcut);
return $strcut.$dot;
}
以上就是本文的全部内容,希望大家能够喜欢。

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