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@wenpeng
Last active January 8, 2016 07:27
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PHP截取中英文混合字符串
<?php
if(!function_exists('sub_str')) {
/**
* 截取UTF-8编码下字符串的函数
*
* @param string $str 被截取的字符串
* @param int $length 截取的长度
* @param bool $append 是否附加省略号
*
* @return string
*/
function sub_str($str, $length = 0, $append = true)
{
$str = trim($str);
$strlength = strlen($str);
if ($length == 0 || $length >= $strlength) {
return $str;
} elseif ($length < 0) {
$length = $strlength + $length;
if ($length < 0) {
$length = $strlength;
}
}
if (function_exists('mb_substr')) {
$newstr = mb_substr($str, 0, $length, 'utf-8');
} elseif (function_exists('iconv_substr')) {
$newstr = iconv_substr($str, 0, $length, 'utf-8');
} else {
$newstr = substr($str, 0, $length);
}
if ($append && $str != $newstr) {
$newstr .= '...';
}
return $newstr;
}
}
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