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    ▪PHP IPV6正则表达式验证代码       代码如下:<?php // literally from the ABNF in rfc3986 (thanks to 'WCP') function validateIPv6($IP) { return preg_match('/\A (?: (?: (?:[a-f0-9]{1,4}:){6} ::(?:[a-f0-9]{1,4}:){5} (?:[a-f0-9]{1,4})?::(?:[a-f0-9]{1,4}:){4} (?:(?:[a-f0-9]{1,4}:){0.........

    ▪php foreach 使用&(与运算符)引用赋值要注意的问题       foreach 通过在 $value 之前加上 & 很容易就能修改数组的单元，如： PHP代码 代码如下: foreach($arr as $value){ $value .= '4'; } 但这个用法也很容易造成错误，而且也不容易找。 看例子更直截了当.........

    ▪PHP 截取字符串函数整理(支持gb2312和utf-8)       1、截取GB2312字符用的函数 PHP代码 代码如下: <?php //截取中文字符串 function mysubstr($str, $start, $len) { $tmpstr = ""; $strlen = $start + $len; for($i = 0; $i < $strlen; $i++) { if(ord(substr($str, $i, 1)) > 0xa0) { .........

代码如下:

<?php
// literally from the ABNF in rfc3986 (thanks to 'WCP')
function validateIPv6($IP)
{
return preg_match('/\A
(?:
(?:
(?:[a-f0-9]{1,4}:){6}

::(?:[a-f0-9]{1,4}:){5}

(?:[a-f0-9]{1,4})?::(?:[a-f0-9]{1,4}:){4}

(?:(?:[a-f0-9]{1,4}:){0,1}[a-f0-9]{1,4})?::(?:[a-f0-9]{1,4}:){3}

(?:(?:[a-f0-9]{1,4}:){0,2}[a-f0-9]{1,4})?::(?:[a-f0-9]{1,4}:){2}

(?:(?:[a-f0-9]{1,4}:){0,3}[a-f0-9]{1,4})?::[a-f0-9]{1,4}:

(?:(?:[a-f0-9]{1,4}:){0,4}[a-f0-9]{1,4})?::
)
(?:
[a-f0-9]{1,4}:[a-f0-9]{1,4}

(?:(?:[0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])\.){3}
(?:[0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])
)

(?:
(?:(?:[a-f0-9]{1,4}:){0,5}[a-f0-9]{1,4})?::[a-f0-9]{1,4}

(?:(?:[a-f0-9]{1,4}:){0,6}[a-f0-9]{1,4})?::
)
)\Z/ix',
$IP
);
}
?>

代码如下:

foreach($arr as $value){
$value .= '4';
}

代码如下:

<?php
$arr = array('a','b','c');
$arr2 = array('d', 'e', 'f');

foreach($arr as $value){//习惯用$value或$val
$value .= '4';
}

//都处理完毕我们在页面模版输出,首先输出$arr2
foreach($arr2 as $value){//习惯用$value或$val
//echo $value;
}
//然后再这样输出 $arr;
foreach($arr as $value){//习惯用$value或$val
echo $value, "\n";
}
?>

代码如下:

XML/HTML代码
a4
b4
b4

代码如下:

Array
(
[0] => a4
[1] => b4
[2] => f
)

代码如下:

foreach($arr as $value){
$value .= '4';
}
unset($value);

代码如下:

<?php
//截取中文字符串
function mysubstr($str, $start, $len) {
$tmpstr = "";
$strlen = $start + $len;
for($i = 0; $i < $strlen; $i++) {
if(ord(substr($str, $i, 1)) > 0xa0) {
$tmpstr .= substr($str, $i, 2);
$i++;
} else
$tmpstr .= substr($str, $i, 1);
}
return $tmpstr;
}
?>

代码如下:

<?php
//截取utf8字符串
function utf8Substr($str, $from, $len)
{
return preg_replace('#^(?:[\x00-\x7F]|[\xC0-\xFF][\x80-\xBF]+){0,'.$from.'}'.
'((?:[\x00-\x7F]|[\xC0-\xFF][\x80-\xBF]+){0,'.$len.'}).*#s',
'$1',$str);
}
?>

代码如下:

<?php
/*
Utf-8、gb2312都支持的汉字截取函数
cut_str(字符串, 截取长度, 开始长度, 编码);
编码默认为 utf-8
开始长度默认为 0
*/

function cut_str($string, $sublen, $start = 0, $code = 'UTF-8')
{
if($code == 'UTF-8')
{
$pa = "/[\x01-\x7f]|[\xc2-\xdf][\x80-\xbf]|\xe0[\xa0-\xbf][\x80-\xbf]|[\xe1-\xef][\x80-\xbf][\x80-\xbf]|\xf0[\x90-\xbf][\x80-\xbf][\x80-\xbf]|[\xf1-\xf7][\x80-\xbf][\x80-\xbf][\x80-\xbf]/";
preg_match_all($pa, $string, $t_string);

if(count($t_string[0]) - $start > $sublen) return join('', array_slice($t_string[0], $start, $sublen))."...";
return join('', array_slice($t_string[0], $start, $sublen));
}
else
{
$start = $start*2;
$sublen = $sublen*2;
$strlen = strlen($string);
$tmpstr = '';

for($i=0; $i< $strlen; $i++)
{
if($i>=$start && $i< ($start+$sublen))
{
if(ord(substr($string, $i, 1))>129)
{
$tmpstr.= substr($string, $i, 2);
}
else
{
$tmpstr.= substr($string, $i, 1);
}
}
if(ord(substr($string, $i, 1))>129) $i++;
}
if(strlen($tmpstr)< $strlen ) $tmpstr.= "...";
return $tmpstr;
}
}

$str = "abcd需要截取的字符串";
echo cut_str($str, 8, 0, 'gb2312');
?>

代码如下:

<?php
/**
* @package BugFree
* @version $Id: FunctionsMain.inc.php,v 1.32 2005/09/24 11:38:37 wwccss Exp $
*
*
* Return part of a string(Enhance the function substr())
*
* @author Chunsheng Wang <wwccss@263.net>
* @param string $String the string to cut.
* @param int $Length the length of returned string.
* @param booble $Append whether append "...": false|true
* @return string the cutted string.
*/
function sysSubStr($String,$Length,$Append = false)
{
if (strlen($String) < = $Length )
{
return $String;
}
else
{
$I = 0;
while ($I < $Length)
{
$StringTMP = substr($String,$I,1);
if ( ord($StringTMP) >=224 )
{
$StringTMP = substr($String,$I,3);
$I = $I + 3;
}
elseif( ord($StringTMP) >=192 )
{
$StringTMP = substr($String,$I,2);
$I = $I + 2;
}
else
{
$I = $I + 1;
}
$StringLast[] = $StringTMP;
}
$StringLast = implode("",$StringLast);
if($Append)
{
$StringLast .= "...";
}
return $StringLast;
}
}

$String = "book.chinaz.com -- 站长书库、站长教程";
$Length = "18";
$Append = false;
echo sysSubStr($String,$Length,$Append);
?>