php 截取中文字符串实现程序

//$str是要截取的字符串
//$start是要截取的字符的开始位置
//$len是指要截取的字符长度
function sub_str($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."...";
}

<?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);
}
?>

< ?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 = "www.111cn.net 走在中国自动化测试的前沿";
$Length = "18";
$Append = false;
echo sysSubStr($String,$Length,$Append);
?>

$array1 = array(1=>'0');
$array2 = array(1=> "data");
$result3 = array_merge($array2,$array1);/*结果为$array2和$array1的值，键名被重新分配*/

a = array(
    'a',
);
$b = array(
    'u',
);
$c = $a + $b;
var_dump($c);
 
output:
array(1) {
  [0]=>
  string(1) "a"
}

<?php
$fruit1 = array("apple" => "red", "banana" => "yellow");
$fruit2 = array("pear" => "yellow", "apple" => "green");
$result = array_merge_recursive($fruit1, $fruit2);
print_r($result);

// output
// Array ( [apple] => Array ( [0] => red [1] => green ) [banana] => yellow [pear] => yellow )
?>

1 "savePath" => "upload/".date("Ymd")."/"

1 $tmpName = $savePath . rand( 1 , 10000 ) . time() . strrchr( $imgUrl , '.' );

1 $tmpName = $savePath . date("Ymd")."/".rand( 1 , 10000 ) . time() . strrchr( $imgUrl , '.' );

<?php
    $url = 'http://www.xxx.com/images/test.jpg';
 
    if( @fopen( $url, 'r' ) )
    {
        echo 'File Exits';
    }
    else
    {
        echo 'File Do Not Exits';
    }
 ?>

 $url = "http://www.111cn.net /.gif";
 
    $info = parse_url($url);
    $fp = fsockopen($info['host'], 80,$errno, $errstr, 30);
    fputs($fp,"GET {$info['path']} HTTP/1.1rn");
    fputs($fp, "Host: {$info['host']}rn");
    fputs($fp, "Connection: closernrn");
    $headers = array();
    while(!feof($fp)) {
    $line = fgets($fp);
    if($line != "rn") {
    $headers[] = $line;
    }else {
    break;
    }
    }
 
    echo "<pre>";
    print_r($headers);

$num = mt_rand(0,9999999);

function random($length) {
     srand(date("s"));
     $possible_charactors = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
     $string = "";
     while(strlen($string)<$length) {
          $string .= substr($possible_charactors,(rand()%(strlen($possible_charactors))),1);
     }
     return($string);
}

function random_string($length, $max=FALSE)
{
  if (is_int($max) && $max > $length)
  {
    $length = mt_rand($length, $max);
  }
  $output = '';
 
  for ($i=0; $i<$length; $i++)
  {
    $which = mt_rand(0,2);
   
    if ($which === 0)
    {
      $output .= mt_rand(0,9);
    }
    elseif ($which === 1)
    {
      $output .= chr(mt_rand(65,90));
    }
    else
    {
      $output .= chr(mt_rand(97,122));
    }
  }
  return $output;
}

<?php
// 说明：php 中生成随机字符串的方法
// 整理：http://www.111cn.net
function genRandomString($len)
{
    $chars = array(
        "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", 
        "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", 
        "w", "x", "y", "z", "A", "B", "C", "D", "E", "F", "G", 
        "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", 
        "S", "T", "U", "V", "W", "X", "Y", "Z", "0", "1", "2", 
        "3", "4", "5", "6", "7", "8", "9"
    );
    $charsLen = count($chars) - 1;
    shuffle($chars);    // 将数组打乱
     
    $output = "";
    for ($i=0; $i<$len; $i++)
    {
        $output .= $chars[mt_rand(0, $charsLen)];
    }
    return $output;
}
$str = genRandomString(25);
$str .= "<br />";
$str .= genRandomString(25);
$str .= "<br />";
$str .= genRandomString(25);
echo $str;
?>