PHP入门

php 批量删除文件
 elseif($doing == 'delfiles') {
  if ($dl) {
   $dfiles='';
   $succ = $fail = 0;
   foreach ($dl as $filepath => $value) {
    if (@unlink($filepath)) {
     $succ++;
    } else {
     $fail++;
    }
   }
   m('删除文件 '.count($dl).' 成功 '.$succ.' 失败 '.$fail);
  } else {
   m('请选择文件');
  }

function copy($from, $to) {
  if ($this->abspath($to)=="/") $to=$this->basedir;
  if ($this->dirname($from) == $this->dirname($to)) $to = $this->dirname($to).'/复件'.basename($from);
  if (!is_dir($from)) {
   return @copy($from, $to);
  } else {
   if (!is_dir($to)) @mkdir($to);
   $path = opendir($from);
   while( $file = readdir( $path ) ) {
    if (($file=='.')||($file=='..')) continue;
    if (is_dir($from.'/'.$file)) $this->copy($from.'/'.$file, $to.'/'.$file);
    else echo basename($file), copy($from.'/'.$file, $to.'/'.$file) ? ' Success!' : ' False.', '<br />';
   }
   return true;
  }
 }

php 获取系统当前路径与检查php配置参数
function getPath($mainpath, $relativepath) {
  global $dir;
  $mainpath_info           = explode('/', $mainpath);
  $relativepath_info       = explode('/', $relativepath);
  $relativepath_info_count = count($relativepath_info);
  for ($i=0; $i<$relativepath_info_count; $i++) {
   if ($relativepath_info[$i] == '.' || $relativepath_info[$i] == '') continue;
   if ($relativepath_info[$i] == '..') {
    $mainpath_info_count = count($mainpath_info);
    unset($mainpath_info[$mainpath_info_count-1]);
    continue;
   }
   $mainpath_info[count($mainpath_info)] = $relativepath_info[$i];
  } //end for
  return implode('/', $mainpath_info);
 }

共有的成员还有办法解决，例如：
class A {
static public $child;
}
A::$child = new B();

对于私有的成员似乎就没有什么干净的方法了，只能这样做：
class A {
static private $child;
static public initialize() {
self::$child = new B();
}
}
A::initialize();

foreach(array('_GET','_POST') as $_request) {
 foreach($$_request as $_key => $_value) {
  if ($_key{0} != '_') {
   if (IS_GPC) {
    $_value = s_array($_value);
   }
   $$_key = $_value;
  }
 }
}

if ($insert && $insertsql) {php 批量保存数据与批量更新数据
  $keystr = $valstr = $tmp = '';
  foreach($insertsql as $key => $val) {
   if ($val) {
    $keystr .= $tmp.$key;
    $valstr .= $tmp."'".addslashes($val)."'";
    $tmp = ',';
   }
  }
  if ($keystr && $valstr) {
   dbconn($dbhost,$dbuser,$dbpass,$dbname,$charset,$dbport);
   m(q("INSERT INTO $tablename ($keystr) VALUES ($valstr)") ? 'Insert new record of success' : mysql_error());
  }
 }
 if ($update && $insertsql && $base64) {
  $valstr = $tmp = '';
  foreach($insertsql as $key => $val) {
   $valstr .= $tmp.$key."='".addslashes($val)."'";
   $tmp = ',';
  }
  if ($valstr) {
   $where = base64_decode($base64);
   dbconn($dbhost,$dbuser,$dbpass,$dbname,$charset,$dbport);
   m(q("UPDATE $tablename SET $valstr WHERE $where LIMIT 1") ? 'Record updating' : mysql_error());
  }
 }

php 显示今天是星期几与一年的每几天代码

public function getPart ($part) {
  $source = $this->timestamp;
  switch($part)
  {
   case 'yy' : $result = intval(date("Y", $source)); break; //年
   case 'mm' : $result = intval(date("m", $source)); break; //月
   case 'dd' : $result = intval(date("d", $source)); break; //日
   case 'w'  : $result = intval(date("N", $source)); break; //星期 [1-7] "1"表示星期一
   case 'cw' : $index = date("N", $source); //中文星期
      $week_array = array('1'=>'一', '2'=>'二', '3'=>'三', '4'=>'四', '5'=>'五', '6'=>'六', '7'=>'日');
      $result = '星期' . $week_array[$index];

php 正则html网址代码

$pattern = "/[w-]+.(com|net|org|gov|cc|biz|info|cn)(.(cn|hk))*/";
    preg_match($pattern, http://pic4.phprm.com/2015/07/04/$url.jpg, $matches);
    if(count($matches) > 0) {
        return $matches[0];
    }else{
        $rs = parse_url($url);
        $main_url = $rs["host"];
        if(!strcmp(long2ip(sprintf("%u",ip2long($main_url))),$main_url)) {
            return $main_url;
        }else{
            $arr = explode(".",$main_url);
            $count=count($arr);
            $endArr = array("com","net","org","3322");//com.cn  net.cn 等情况
            if (in_array($arr[$count-2],$endArr)){
                $domain = $arr[$count-3].".".$arr[$count-2].".".$arr[$count-1];
            }else{
                $domain =  $arr[$count-2].".".$arr[$count-1];
            }
            return $domain;
        }// end if(!strcmp...)
    }// end if(count...)
}// end function

php image_type_to_mime_type

image_type_to_mime_type - 获取MIME的图像类型和getimagesize返回类型，exif_read_data，exif_thumbnail，本函数

取本周第一天的日期 每周第一天是星期几

 * 设置每周第一天是星期几
  * @param string $week 星期0-6
  * @return void
  */
 public function setFirstDayOfWeek($week = 1) {
  $this->firstDayOfWeek = $week;
 }
 

ajax+php检测文章标题是否存在代码
php代码
function checkTitle()
 {
  $title = PostGet('title');
  if( empty( $title ) )
  {
   return false;
  }
  else
  {
   $Db = new Db();
   $row = $Db->query("Select * from news where title ='$title'");
   if( $Db->rows( $row ) )
   {
    echo 1;
   }
   else
   {
    return NULL;
   }
  }
 }
js代码
function createXMLHttpRequest(){//创建XMLHttpRequest对象
 if(window.ActiveXObject){//IE
  try {
   return new ActiveXObject("Microsoft.XMLHTTP");
  } catch(e){
   return;
  }
 }else if(window.XMLHttpRequest){//Mozilla,firefox
  try {
   return new XMLHttpRequest();
  } catch(e){
   return;
  }
 }
}

php elseif 与else if区别

if、elseif 以及 else 语句用于执行基于不同条件的不同动作。