php反中文汉字转Unicode编码实现程序

/**
 * $str 原始字符串
 * $encoding 原始字符串的编码，默认GBK
 * $prefix 编码后的前缀，默认"&#"
 * $postfix 编码后的后缀，默认";"
 */
function unicode_encode($str, $encoding = 'GBK', $prefix = '&#', $postfix = ';') {
    $str = iconv($encoding, 'UCS-2', $str);
    $arrstr = str_split($str, 2);
    $unistr = '';
    for($i = 0, $len = count($arrstr); $i < $len; $i++) {
        $dec = hexdec(bin2hex($arrstr[$i]));
        $unistr .= $prefix . $dec . $postfix;
    }
    return $unistr;
}
 
/**
 * $str Unicode编码后的字符串
 * $encoding 原始字符串的编码，默认GBK
 * $prefix 编码字符串的前缀，默认"&#"
 * $postfix 编码字符串的后缀，默认";"
 */
function unicode_decode($unistr, $encoding = 'GBK', $prefix = '&#', $postfix = ';') {
    $arruni = explode($prefix, $unistr);
    $unistr = '';
    for($i = 1, $len = count($arruni); $i < $len; $i++) {
        if (strlen($postfix) > 0) {
            $arruni[$i] = substr($arruni[$i], 0, strlen($arruni[$i]) - strlen($postfix));
        }
        $temp = intval($arruni[$i]);
        $unistr .= ($temp < 256) ? chr(0) . chr($temp) : chr($temp / 256) . chr($temp % 256);
    }
    return iconv('UCS-2', $encoding, $unistr);
}

//GBK字符串测试
$str = '<b>哈哈</b>';
echo $str.'<br />';
 
$unistr = unicode_encode($str);
echo $unistr.'<br />'; // &#60;&#98;&#62;&#21704;&#21704;&#60;&#47;&#98;&#62;
 
$str2 = unicode_decode($unistr);
echo $str2.'<br />'; //<b>哈哈</b>
 
//UTF-8字符串测试
$utf8_str = iconv('GBK', 'UTF-8', $str);
echo $utf8_str.'<br />'; // <b>????</b> 注：UTF在GBK下显示的乱码！可切换浏览器的编码测试
 
$utf8_unistr = unicode_encode($utf8_str, 'UTF-8');
echo $utf8_unistr.'<br />'; // &#60;&#98;&#62;&#21704;&#21704;&#60;&#47;&#98;&#62;
 
$utf8_str2 = unicode_decode($utf8_unistr, 'UTF-8');
echo $utf8_str2.'<br />'; // <b>????</b>
 
//其它后缀、前缀测试
$prefix_unistr = unicode_encode($str, 'GBK', "\u", '');
echo $prefix_unistr.'<br />'; // u60u98u62u21704u21704u60u47u98u62
 
$profix_unistr2 = unicode_decode($prefix_unistr, 'GBK', "\u", '');
echo $profix_unistr2.'<br />'; //<b>哈哈</b>

<?php
class runtime
{
    var $StartTime = 0;
    var $StopTime = 0;
 
    function get_microtime()
    {
        list($usec, $sec) = explode(' ', microtime());
        return ((float)$usec + (float)$sec);
    }
 
    function start()
    {
        $this->StartTime = $this->get_microtime();
    }
 
    function stop()
    {
        $this->StopTime = $this->get_microtime();
    }
 
    function spent()
    {
        return round(($this->StopTime - $this->StartTime) * 1000, 1);
    }
 
}
 
 
//例子
$runtime= new runtime;
$runtime->start();
 
//你的代码开始
 
$a = 0;
for($i=0; $i<1000000; $i++)
{
    $a += $i;
}
 
//你的代码结束
 
$runtime->stop();
echo "页面执行时间: ".$runtime->spent()." 毫秒";
?>

<?php

$searchValue = (int)$_GET['key'];

function search(array $array, $value)
{
$max = count($array)-1;
$min = 0;
$isAscSort = $array[$min] < $array[$max];

while (TRUE) {
$sum = $min+$max;
$midKey = (int)($sum%2 == 1 ? ceil($sum/2) : $sum/2);

if ($max < $min) {
return -1;
} else if ($value == $array[$midKey]) {
return 1;
} else if ($value > $array[$midKey]) {
$isAscSort ? $min = $midKey+1 : $max = $midKey-1;
} else if ($value < $array[$midKey]) {
$isAscSort ? $max = $midKey-1 : $min = $midKey+1;
}
}
}

$array = array(
'4', '5', '7', '8', '9', '10', '11', '12'
);
// 正序
echo search($array, $searchValue);

// 逆序
rsort($array);
echo search($array, $searchValue);

<?php
     #随机选择第i小的数字，用随机快排实现
    
     #交换元素
     function swap(&$arr, $i, $j) {
         $temp = $arr[$i];
         $arr[$i] = $arr[$j];
         $arr[$j] = $temp;
     }
 
     #随机划分
     function randomized_partition(&$arr, $begin, $end) {
         $rand_inx = rand($begin, $end);
         swap($arr, $begin, $rand_inx);
         return partition($arr, $begin, $end);
     }
 
     #划分
     function partition(&$arr, $begin, $end) {
         #以第一个元素作为中枢元素
         $pivot = $begin;
         $low = $begin;
         $high = $end;
 
         while ($low < $high) {
             while ($low < $high && $arr[$low] <= $arr[$pivot]) {
                 $low++;
             }
 
             while ($low < $high && $arr[$high] >= $arr[$pivot]) {
                 $high--;
             }
 
             swap($arr, $low, $high);
         }
 
         #交换中枢元素
         if ($arr[$pivot] < $arr[$low]) {
             $low--;
         }
         swap($arr, $pivot, $low);
         return $low;
     }
 
     #快速排序，此处没用到
     function quick_sort(&$arr, $begin, $end) {
         $q = randomized_partition($arr, $begin, $end);
         if ($q > $begin) {
             quick_sort($arr, $begin, $q - 1);
         }
         if ($q < $end) {
             quick_sort($arr, $q + 1, $end);
         }
     }
 
     #选取第i小的数
     function randomized_select(&$arr, $begin, $end, $i) {
         if ($begin == $end) {
             return $arr[$begin];
         }
 
         $q = randomized_partition($arr, $begin, $end);
         $k = $q - $begin + 1; #k代表小于等于q的元素个数
 
         if ($k == $i) { #如果k=i,说明q就是第i小的元素坐标
             return $arr[$q];
         } else if ($i < $k) { #如果i<k，说明第i小的元素位于q的左边
             return randomized_select($arr, $begin, $q - 1, $i);
         } else { #第i小的元素位于q的右边,此时查找右边的第i-k小的元素
             return randomized_select($arr, $q + 1, $end, $i - $k);
         }
     }
 
     $arr = array(1, 5, 3, 7, 0, 0, 8, 4, 2, 9, 11);
     $t = randomized_select($arr, 0, count($arr) - 1, 8);
     print_r("The 8th minimum element: {$t}");
     echo "<br>";
     quick_sort($arr, 0, count($arr) - 1);
     print_r($arr);
 ?>

$str="ssdsf<a target='_blank' href='http://www.111cn.net/' >sdf</a>sdfss";
if(preg_match("/<a/s+href=[^>]*>|<//[^a]*a[^>]*>/i",$str))
{
echo "该字符串有超链接";
}
else
{
echo "该字符串没有超链接标记";
}
?>

<?php
echo preg_replace("/(?<=href=)([^>]*)(?=>)/i","#", "<a href='www.111cn.net'>你好，点这里看看</a><a href='www.111cn.net'>你好，点这里看看</a>");
?>

function match_links($document) {   

    preg_match_all("'<s*as.*?hrefs*=s*(["'])?(?(1)(.*?)\1|([^s>]+))[^>]*>?(.*?)</a>'isx",$document,$links);                       

    while(list($key,$val) = each($links[2])) {

        if(!empty($val))

            $match['link'][] = $val;

    }

    while(list($key,$val) = each($links[3])) {

        if(!empty($val))

            $match['link'][] = $val;

    }       

    while(list($key,$val) = each($links[4])) {

        if(!empty($val))

            $match['content'][] = $val;

    }

    while(list($key,$val) = each($links[0])) {

        if(!empty($val))

            $match['all'][] = $val;

    }               

    return $match;

}