这是一些自定义封装的函数类，调用起来很方便，以后会有更多的封装函数更新！

// 弹框跳转
function alert($msg,$url=‘‘){
echo "<script>";
echo "alert(‘$msg‘);";
if($url){
echo "window.location.href=http://www.mamicode.com/‘$url‘;";
}else{
echo "window.history.go(-1);";
}
echo "</script>";
}

//获取单条数据
function getONE($sql){
$sql = mysql_query($sql);
$list = array();
if($sql && mysql_affected_rows()>0){
$list = mysql_fetch_assoc($sql);
}return $list;
}

//获取多条数据
function getALL($sql){
$sql = mysql_query($sql);
$list = array();
if($sql && mysql_affected_rows()>0){
while($row = mysql_fetch_assoc($sql)){
$list[] = $row;
}
}return $list;
}

/**
* [delete 删除数据]
* @param [string] $table [表名]
* @param [string] $where [条件]
* @return [boolean] [返回结果]
*/
//删除数据SQL语句封装
function delete($table,$where){
//构造删除的SQL语句
$sql = "DELETE FROM `$table` WHERE $where;";
//把SQL语句执行
$res = mysql_query($sql);
//判断是否执行成功
if($res && mysql_affected_rows()>0){
return true;
}else{
return false;
}
}

/**
* [update 更新数据]
* @param [string] $table [表名]
* @param [array] $array [要更新的数据]
* @param [string] $where [条件]
* @return [type] [返回结果]
*/
//更新数据SQL语句封装
function update($table,$array,$where){
$str = ‘‘;
foreach($array as $key => $value){
$str .= "`".$key."`=‘".$value."‘,";
}
//去除最右边的逗号
$str = rtrim($str,‘,‘);
//构造更新的SQL语句
$sql = "UPDATE `$table` SET $str WHERE $where";
// dump($sql);exit;
$res = mysql_query($sql);
//判断是否执行成功
if($res){
return true;
}else{
return false;
}
}

/**
* [insert 插入数据]
* @param [string] $table [表名]
* @param [array] $data [数据]
* @return [bool] [是否成功]
*/
function insert($table,$data){
$tmp = array_keys($data);
$field = ‘`‘.implode(‘`,`‘, $tmp).‘`‘;
$value = "http://www.mamicode.com/‘".implode("‘,‘",$data)."‘";
$sql = "INSERT INTO $table ($field) VALUES ($value)";
// dump($sql);exit;
$res = mysql_query($sql);
if($res && mysql_affected_rows()>0){
return mysql_insert_id();
}else{
return false;
}
}

//pre预排版打印
function dump($content){
echo "<pre>";
print_r($content);
echo "</pre>";
}

/**
*
* 字符截取
* @param string $string
* @param int $start
* @param int $length
* @param string $charset
* @param string $dot
*
* @return string
*/
function str_cut(&$string, $start, $length, $charset = "utf-8", $dot = ‘...‘) {
if(function_exists(‘mb_substr‘)) {
if(mb_strlen($string, $charset) > $length) {
return mb_substr ($string, $start, $length, $charset) . $dot;
}
return mb_substr ($string, $start, $length, $charset);

}else if(function_exists(‘iconv_substr‘)) {
if(iconv_strlen($string, $charset) > $length) {
return iconv_substr($string, $start, $length, $charset) . $dot;
}
return iconv_substr($string, $start, $length, $charset);
}

$charset = strtolower($charset);
switch ($charset) {
case "utf-8" :
preg_match_all("/[\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]/", $string, $ar); if(func_num_args() >= 3) { if (count($ar[0]) > $length) { return join("", array_slice($ar[0], $start, $length)) . $dot; } return join("", array_slice($ar[0], $start, $length)); } else { return join("", array_slice($ar[0], $start)); } break; default: $start = $start * 2; $length = $length * 2; $strlen = strlen($string); for ( $i = 0; $i < $strlen; $i++ ) { if ( $i >= $start && $i < ( $start + $length ) ) { if ( ord(substr($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 .= $dot; return $tmpstr; }}

/**
* [uploads 文件上传函数]
* @param [string] $name [表单域的name名]
* @param [string] $catalog [文件保存的路径]
* @param array $type [允许上传的文件类型]
* @param integer $size [允许上传的文件大小]
* @return [array] [error 1 上传失败 2 上传成功]
*/
function uploads($name,$catalog,$type=array(‘jpg‘,‘jpeg‘,‘gif‘,‘png‘),$size=1048576){
$status = $_FILES[$name][‘error‘];
if($status>0){
switch($status){
case 1:
$res[‘msg‘] = "文件上传超过最大值2M";
$res[‘err‘] = 1;
return $res;
break;
case 2:
$res[‘msg‘] = "文件上传超过MAX_FILE_SIZE大小";
$res[‘err‘] = 1;
return $res;
break;
case 3:
$res[‘msg‘] = "文件上传失败";
$res[‘err‘] = 1;
return $res;
break;
case 4:
$res[‘msg‘] = ‘请选择文件‘;
$res[‘err‘] = 1;
return $res;
break;
default:
break;
}
}
if($_FILES[$name][‘size‘]>$size){
$res[‘msg‘] = ‘上传文件超出指定大小‘;
$res[‘err‘] = 1;
return $res;
}
$ext = pathinfo($_FILES[$name][‘name‘],PATHINFO_EXTENSION);

if(!in_array($ext,$type)){
$res[‘msg‘] = ‘请上传指定的文件类型‘;
$res[‘err‘] = 1;
return $res;
}
//第一种做法
$catalog = rtrim($catalog,‘/‘);
$dir = $catalog;
if(!is_dir($dir)){
mkdir($dir,0777,true);
}
do{
$file = time().mt_rand(1000,9999);

$filename = $file.‘.‘.$ext;

$newname = $dir.‘/‘.$filename;

}while(is_file($dir.‘/‘.$filename));
move_uploaded_file($_FILES[$name][‘tmp_name‘], $dir.‘/‘.$filename);
$res[‘msg‘] = ‘文件上传成功‘;
$res[‘err‘] = 2;
$res[‘filename‘] = $filename;
$res[‘name‘] = $filename;
return $res;
}

//封装缩略图的函数
function small($file,$widths,$heights,$address){
$filename="$file";
$info = getimagesize($filename);

//获取图片的宽
$width = $info[0];
//获取图片的高
$height = $info[1];

//打开图片
if($info[2]==1){
$parent = imagecreatefromgif($filename);
}else if($info[2]==2){
$parent = imagecreatefromjpeg($filename);
}else if($info[2]==3){
$parent = imagecreatefrompng($filename);
}

$son_width = $widths;
$son_height = $heights;
// 等比例缩放
// $son_height = ceil(($height*$son_width)/$width);

//w/h = s_w/s_h
//新建图像
$son = imagecreatetruecolor($son_width,$son_height);

imagecopyresized($son,$parent,0,0,0,0,$son_width,$son_height,$width,$height);
$path = pathinfo($filename,PATHINFO_EXTENSION);
$time = time();
$pathname = $time.mt_rand(1000,9999).‘.‘.$path;

$save = $address.$pathname;
if($info[2]==1){ imagegif($son,$save); }else if($info[2]==2){ imagejpeg($son,$save); }else if($info[2]==3){ imagepng($son,$save); } imagedestroy($son); imagedestroy($parent); return $pathname; }

/**
* 获得用户的真实IP地址
*
* @access public
* @return string
*/
function real_ip()
{
static $realip = NULL;

if ($realip !== NULL)
{
return $realip;
}

if (isset($_SERVER))
{
if (isset($_SERVER[‘HTTP_X_FORWARDED_FOR‘]))
{
$arr = explode(‘,‘, $_SERVER[‘HTTP_X_FORWARDED_FOR‘]);

/* 取X-Forwarded-For中第一个非unknown的有效IP字符串 */
foreach ($arr AS $ip)
{
$ip = trim($ip);

if ($ip != ‘unknown‘)
{
$realip = $ip;

break;
}
}
}
elseif (isset($_SERVER[‘HTTP_CLIENT_IP‘]))
{
$realip = $_SERVER[‘HTTP_CLIENT_IP‘];
}
else
{
if (isset($_SERVER[‘REMOTE_ADDR‘]))
{
$realip = $_SERVER[‘REMOTE_ADDR‘];
}
else
{
$realip = ‘0.0.0.0‘;
}
}
}
else
{
if (getenv(‘HTTP_X_FORWARDED_FOR‘))
{
$realip = getenv(‘HTTP_X_FORWARDED_FOR‘);
}
elseif (getenv(‘HTTP_CLIENT_IP‘))
{
$realip = getenv(‘HTTP_CLIENT_IP‘); } else { $realip = getenv(‘REMOTE_ADDR‘); } } preg_match("/[\d\.]{7,15}/", $realip, $onlineip); $realip = !empty($onlineip[0]) ? $onlineip[0] : ‘0.0.0.0‘; return $realip;}

/**
* [arraySort 无限极分类函数]
* @param [type] $arr [description]
* @param integer $parentid [description]
* @return [type] [description]
*/
function arraySort($arr,$id,$pid,$parentid=0){
$list=array();
foreach($arr as $key => $v){
if($v[$pid]==$parentid){
$tmp = arraySort($arr,$id,$pid,$v[$id]);
if($tmp){
$v[‘submenu‘] = $tmp;
}
$list[]=$v;
}
}
return $list;
}

php函数封装