PHP定义验证码图形大小函数

PHP定义验证码图形大小函数

<?
function vCode($num=4,$size=20, $width=0,$height=0){
!$width && $width = $num*$size*4/5+5;
!$height && $height = $size + 10;
// 去掉了 0 1 O l 等
$str = "23456789abcdefghijkmnpqrstuvwxyzABCDEFGHIJKLMNPQRSTUVW";
$code = '';
for ($i=0; $i<$num; $i++){
$code.= $str[mt_rand(0, strlen($str)-1)];
}
// 画图像
$im = imagecreatetruecolor($width,$height);
// 定义要用到的颜色
$back_color = imagecolorallocate($im, 235, 236, 237);
$boer_color = imagecolorallocate($im, 118, 151, 199);
$text_color = imagecolorallocate($im, mt_rand(0,200), mt_rand(0,120), mt_rand(0,120));

// 画背景
imagefilledrectangle($im,0,0,$width,$height,$back_color);
// 画边框
imagerectangle($im,0,0,$width-1,$height-1,$boer_color);
// 画干扰线
for($i=0;$i<5;$i++){
$font_color = imagecolorallocate($im, mt_rand(0,255), mt_rand(0,255), mt_rand(0,255));
imagearc($im,mt_rand(-$width,$width),mt_rand(-$height,$height),mt_rand(30,$width*2),mt_rand(20,$height*2),mt_rand(0,360),mt_rand(0,360),$font_color);
}
// 画干扰点
for($i=0;$i<50;$i++){
$font_color = imagecolorallocate($im, mt_rand(0,255), mt_rand(0,255), mt_rand(0,255));
imagesetpixel($im,mt_rand(0,$width),mt_rand(0,$height),$font_color);
}
// 画验证码
@imagefttext($im, $size , 0, 5, $size+3, $text_color, 'c:\WINDOWS\Fonts\simsun.ttc',$code);
header("Cache-Control: max-age=1, s-maxage=1, no-cache, must-revalidate");
header("Content-type: image/png");
imagepng($im);
imagedestroy($im);
}
vCode(4,20);

?>

求二两日期之差函数

<?php
$time1 = "2008-6-15 11:49:59";//第一个时间
$time2 = "2007-5-5 12:53:28";//第二个时间
$t1 = strtotime($time1);
$t2 = strtotime($time2);
$t12 = abs($t1-$t2);
$start = 0;
$string = "两个时间相差：";
$y = floor($t12/(3600*24*360));
if($start || $y )
{
$start = 1;
$t12 -= $y*3600*24*360;
$string .= $y."年";
}
$m = floor($t12/(3600*24*31));
if($start || $m)
{
$start = 1;
$t12 -= $m*3600*24*31;
$string .= $m."月";
}
$d = floor($t12/(3600*24));
if($start || $d)
{
$start = 1;
$t12 -= $d*3600*24;
$string .= $d."天";
}
$h = floor($t12/(3600));
if($start || $h)
{
$start = 1;
$t12 -= $h*3600;
$string .= $h."时";
}
$s = floor($t12/(60));
if($start || $s)
{
$start = 1;
$t12 -= $s*60;
$string .= $s."分";
}
$string .= "{$t12}秒";
echo $string;
?>

这是一个求任意时间之差的函数

<?
#作者：仙乐
#功能：获得任意时间与当前时间的时间差
function QueryDays($datestr){
#格式化时间
    $da=preg_split("/(-| |:)/i",$datestr);
    $nowyear=date("Y");
    $nowmon=date("n");
    $nowday=date("d");
    $nowtimes=mktime(0,0,0,$nowmon,$nowday,$nowyear);
    $pdtimes= mktime(0,0,0,$nowmon,$nowday,$nowyear-1);
    $bjtimes= mktime(0,0,0,$da[1],$da[2],$da[0]);
#判断所给出的时间是不是在一年内
    if ($bjtimes>=$pdtimes and $bjtimes<=$nowtimes){
        return (floor(strftime("%j",mktime(0,0,0,$nowmon,$nowday,$nowyear)-mktime($da[3],$da[4],$da[5],$da[1],$da[2],$da[0]))));
    }else{
        $loop=$nowyear-$da[0];
        $totaldays=(floor(strftime("%j",mktime(0,0,0,$nowmon,$nowday,$nowyear)-mktime(0,0,0,1,1,$nowyear))));
        for($i=1;$i<=$loop;$i++){
            for($j=12;$j>=1;$j--){
                if ($da[0]==$nowyear-$i and $da[1]==$j){
                    $days=MonDays($nowyear-$i,$j);
                    return $totaldays+=$days-$da[2];
                    break;
                }else{
                    $days=MonDays($nowyear-$i,$j);
                    $totaldays+=$days;
                }//end else
             }//end for
        }//end for
    }//end else
}//end function
#取得月分的天数
function MonDays($year,$month){
    switch ($month){
        case "1":
        case "3":
        case "5":
        case "7":
        case "8":
        case "10":
        case "12": $days=31;break;
        case "4":
        case "6":
        case "9":
        case "11": $days=30;break;
        case "2": 
            if (checkdate($month,29,$year)){
                $days=29;
            }else{
                $days=28;
            }//end else
        break;
    }//end switch
    return $days;
}//end function
$datestr="2002-1-14 9:47:20";
echo QueryDays($datestr);
?>

高亮显示搜索结果代码
<?
function highlight_words($str, $words, $color = '#FFFF00') {
if(is_array($words)) {
foreach($words as $k => $word) {
$pattern[$k] = "/b($word)b/is";
$replace[$k] = '<font style="background-color:'.$color.';">\1</font>';
}
}
else {
$pattern = "/b($words)b/is";
$replace = '<font style="background-color:'.$color.';">\1</font>';
}

return preg_replace($pattern,$replace,$str);
}

$str="sdfasdfasdfas AS asds";
$word="as";
echo highlight_words($str,$word);

?> 

php closedir 函数

closedir
（PHP 4中，PHP 5中）

closedir - 关闭目录句柄

报告错误描述
无效closedir（[资源$ dir_handle指定]）
关闭目录流dir_handle指定。该流必须是曾开幕opendir（）。

报告错误参数

dir_handle指定
处理资源的目录以前与opendir（）打开。如果目录句柄没有指定，最后一个环节由opendir（）打开假设。

看个实例

<?php
$dir = "/etc/php5/";

// Open a known directory, read directory into variable and then close
if (is_dir($dir)) {
    if ($dh = opendir($dir)) {
        $directory = readdir($dh);
        closedir($dh);
    }
}
?>

例子
<?php
//打开 images 目录
$dir = opendir("images");

//列出 images 目录中的文件
while (($file = readdir($dir)) !== false)
  {
  echo "filename: " . $file . "<br />";
  }
  closedir($dir);
?>

filename: .
filename: ..
filename: cat.gif
filename: dog.gif
filename: food
filename: horse.gif

php城市无限分类

classID          classFID          className          classCount
      1                   0                    中国                      0
      2                   1                    浙江                      0
      3                   1                    江苏                      0
      4                   2                    杭州                      0
      5                   4                   西湖区                    0
若
findFather('4','0') 显示 => 杭州
findFather('4','1') 显示 => 浙江
findFather('4','2') 显示 => 中国
findFather('4','3') 显示 => 中国 -> 浙江 -> 杭州
代码如下：
复制代码
    // ========== findFather函数 START ==========
     // 功能:无限级分类之找出父层的相关数据
     // 参数:$classID,当前子层的编号
     //          $type,0找自己 1找父亲 2找祖先 3找家谱
     // 字段:classID主键,自生成 classFID父编号
     //          className分类名称 classCount分类统计
    function findFather($classID,$type)
     {
        global $db,$flist,$forefather;
        define("_STR_CUT", " -> ");

        $db->query("set names 'utf8'");
        $sql         = 'select * from tbl_name where classID = "'.$classID.'"';
        $result         = $db->query($sql);
        $recordCount = $result->num_rows;
        if ($recordCount != 0)
         {
            //取值
            $row       = $result->fetch_assoc();
            $classFID  = $row['classFID'];
            $classID   = $row['classID'];
            $className = $row['className'];

            //若找到祖先,即classFID为0,则将函数状态设为0
            if ($classFID == '0') $type='0';
         }
        
        if ($type == '1') //找父亲
         {
            $type = '0'; //第二次开始函数状态为0,即循环2次
             findFather($classFID,$type);
         }
        else if ($classFID != '0' AND $type == '2') //找祖先,状态type为2,祖先classFID不为0未找到
         {
             findFather($classFID,$type);
         }
        else if ($type == '3')
         {
             findFather($classFID,$type);
            $flist = $flist . _STR_CUT . $className; //生成家谱
         }
        else if ($type == '0')
         {
            $forefather = $className;
         }

        $result = $forefather . $flist;
        return $result;
        
     }