PHP多态代码实例

发布网友 发布时间：2022-04-22 06:09

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懂视网 时间：2022-04-06 05:31

PHP实例方法的例子有：1、PHPExcel读取Excel，2、获取文本中首张图片地址；3、将图片保存到本地；4、返回JSON数据；5、【var_dump】函数改写；6、图片转为base格式等等。

PHP实例方法的例子有：

PHPExcel 读取excel

function readExcel($filename, $encode = 'utf-8')
{
// import("ORG.Util.PHPExcel.IOFactory");
 import("Org/Util/PHPExcel");
 if (strpos($filename, "xlsx")) {
 $objReader = PHPExcel_IOFactory::createReader('Excel2007');
 } else {
 $objReader = PHPExcel_IOFactory::createReader('Excel5');
 }
 $objReader->setReadDataOnly(true);
 $objPHPExcel = $objReader->load($filename);
 $objWorksheet = $objPHPExcel->getActiveSheet();
 $highestRow = $objWorksheet->getHighestRow();
 $highestColumn = $objWorksheet->getHighestColumn();
 $highestColumnIndex = PHPExcel_Cell::columnIndexFromString($highestColumn);
 $excelData = array();
 for ($row = 1; $row <= $highestRow; $row++) {
 if ((string)$objWorksheet->getCellByColumnAndRow(0, $row)->getValue() == "") continue;
 for ($col = 0; $col < $highestColumnIndex; $col++) {
  $value = (string)$objWorksheet->getCellByColumnAndRow($col, 1)->getValue();
  if ($value == "") {
  continue;
  }
  $excelData[$row - 1][] = (string)$objWorksheet->getCellByColumnAndRow($col, $row)->getValue();
 }
 }
 return $excelData;
}

获取文本中首张图片地址

function getFirstPic($content){
 if(preg_match_all("/(src)=(["|']?)([^ "'>]+.(gif|jpg|jpeg|bmp|png))2/i", $content, $matches)){
 $str=$matches[3][0];
 if(preg_match('//ueditor/php/upload/image/',$str)){
  return $str1=substr($str,6);
 }
 }
}

将图片保存到本地

function getImage($url,$save_dir='',$filename='',$type=1){
 if(trim($url)==''){
 return array('file_name'=>'','save_path'=>'','error'=>1);
 }
 if(trim($save_dir)==''){
 $save_dir='./';
 }
 if(trim($filename)==''){//保存文件名
 $ext = strrchr($url,'.');
 if($ext!='.gif'&&$ext!='.jpg'){
  return array('file_name'=>'','save_path'=>'','error'=>3);
 }
 $filename=time().$ext;
 }
 if(0!==strrpos($save_dir,'/')){
 $save_dir.='/';
 }
 //创建保存目录
 if(!file_exists($save_dir)&&!mkdir($save_dir,0777,true)){
 return array('file_name'=>'','save_path'=>'','error'=>5);
 }
 //获取远程文件所采用的方法
 if($type){
 $ch=curl_init();
 $timeout=5;
 curl_setopt($ch,CURLOPT_URL,$url);
 curl_setopt($ch,CURLOPT_RETURNTRANSFER,1);
 curl_setopt($ch,CURLOPT_CONNECTTIMEOUT,$timeout);
 $img=curl_exec($ch);
 curl_close($ch);
 }
 else{
 ob_start();
 readfile($url);
 $img=ob_get_contents();
 ob_end_clean();
 }
 $size=strlen($img);
 echo $size;
 //文件大小
 $fp2=fopen($save_dir.$filename,'a');
 fwrite($fp2,$img);
 fclose($fp2);
 unset($img,$url);
 return array('file_name'=>$filename,'save_path'=>$save_dir.$filename,'error'=>0);
}

返回JSON数据

function show($status, $msg, $closeCurrent=false, $data=array()){
 $tmpArr = array(
 'statusCode' => $status,
 'message' => $msg,
 'closeCurrent' => $closeCurrent,
 );
 $tmpArr = array_merge($tmpArr, $data);
 exit(json_encode($tmpArr));
}

var_dump 函数改写

function lyl_dump($content){
 header("Content-type:text/html;charset=utf-8");
 echo '<meta content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0" name="viewport" />';
 echo "<pre>";
 var_dump($content);
 echo "<pre/>";
 die;
}

图片转为base格式

function baseEncodeImage ($image_file) {
 if(!file_exists($image_file)){
 return false;
 }
 $image_info = getimagesize($image_file);
 $image_data = fread(fopen($image_file, 'r'), filesize($image_file));
 $base_image = chunk_split(base_encode($image_data));
 return $base_image;
}

使用curl 实现get请求

function httpGet($url) {
 $curl = curl_init();
 curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
 curl_setopt($curl, CURLOPT_TIMEOUT, 500);
 curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, true); //这个是的ssl校验，需要验证
 curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, true); //
 curl_setopt($curl, CURLOPT_URL, $url);
 $res = curl_exec($curl);
 curl_close($curl);
 return $res;
}

使用curl 实现post 请求

function httpPost($url,$post_data){
 $curl = curl_init();
 $post_data = json_encode($post_data);
 curl_setopt($ch , CURLOPT_URL , $url);
 curl_setopt($ch , CURLOPT_HEADER , 0 );
 curl_setopt( $ch, CURLOPT_POST, 1);  //设置为POST方式
 curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
 curl_setopt($ch , CURLOPT_POSTFIELDS , $post_data);
 $rst = curl_exec( $ch );
 curl_close( $ch );
 return $rst;
}

简单的xml转数组方法

function simplexml_to_array($simplexml_obj, $array_tags = array(), $strip_white = 1)
{
 if ($simplexml_obj) {
 if (count($simplexml_obj) == 0)
  return $strip_white ? trim((string)$simplexml_obj) : (string)$simplexml_obj;
 $attr = array();
 foreach ($simplexml_obj as $k => $val) {
  if (!empty($array_tags) && in_array($k, $array_tags)) {
  $attr[] = simplexml_to_array($val, $array_tags, $strip_white);
  } else {
  $attr[$k] = simplexml_to_array($val, $array_tags, $strip_white);
  }
 }
 return $attr;
 }
 return FALSE;
}

Utf-8转统一码

function utf8_to_unicode($char)
{
 switch (strlen($char)) {
 case 1:
  return ord($char);
 case 2:
  $n = (ord($char[0]) & 0x3f) << 6;
  $n += ord($char[1]) & 0x3f;
  return $n;
 case 3:
  $n = (ord($char[0]) & 0x1f) << 12;
  $n += (ord($char[1]) & 0x3f) << 6;
  $n += ord($char[2]) & 0x3f;
  return $n;
 case 4:
  $n = (ord($char[0]) & 0x0f) << 18;
  $n += (ord($char[1]) & 0x3f) << 12;
  $n += (ord($char[2]) & 0x3f) << 6;
  $n += ord($char[3]) & 0x3f;
  return $n;
 }
}

字符串转统一编码

function str_to_unicode_word($str,$depart=' ')
{
 $arr = array();
 $str_len = mb_strlen($str,'utf-8');
 for($i = 0;$i < $str_len;$i++)
 {
 $s = mb_substr($str,$i,1,'utf-8');
 if($s != ' ' && $s != '　')
 {
  $arr[] = 'ux'.utf8_to_unicode($s);
 }
 }
 return implode($depart,$arr);
}

获取IP地址

function getIP()
{
 static $realip;
 if (isset($_SERVER)) {
 if (isset($_SERVER["HTTP_X_FORWARDED_FOR"])) {
  $realip = $_SERVER["HTTP_X_FORWARDED_FOR"];
 } else if (isset($_SERVER["HTTP_CLIENT_IP"])) {
  $realip = $_SERVER["HTTP_CLIENT_IP"];
 } else {
  $realip = $_SERVER["REMOTE_ADDR"];
 }
 } else {
 if (getenv("HTTP_X_FORWARDED_FOR")) {
  $realip = getenv("HTTP_X_FORWARDED_FOR");
 } else if (getenv("HTTP_CLIENT_IP")) {
  $realip = getenv("HTTP_CLIENT_IP");
 } else {
  $realip = getenv("REMOTE_ADDR");
 }
 }
 return $realip;
}

创建随机字符串

function createNonceStr($length = 16)
{
 $chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ01234567";
 $str = "";
 for ($i = 0; $i < $length; $i++) {
 $str .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);
 }
 return $str;
}

根据生日获取年龄

function get_age($birthday){
 if($birthday){
 list($y1,$m1,$d1) = explode("-",date("Y-m-d",$birthday));
 list($y2,$m2,$d2) = explode("-",date("Y-m-d",time()));
 $age = $y2-$y1;
 if(intval($m2.$d2) < intval($m1.$d1)) {$age -= 1;}
 return $age;
 }else{
 return "未知";
 }
}

根据经纬度计算距离

function getDistance($lat1, $lng1, $lat2, $lng2)
{
 $earthRadius = 6367000; 
 $lat1 = ($lat1 * pi() ) / 180;
 $lng1 = ($lng1 * pi() ) / 180;
 $lat2 = ($lat2 * pi() ) / 180;
 $lng2 = ($lng2 * pi() ) / 180;
 $calcLongitude = $lng2 - $lng1;
 $calcLatitude = $lat2 - $lat1;
 $stepOne = pow(sin($calcLatitude / 2), 2) + cos($lat1) * cos($lat2) * pow(sin($calcLongitude / 2), 2);
 $stepTwo = 2 * asin(min(1, sqrt($stepOne)));
 $calculatedDistance = $earthRadius * $stepTwo;
 return round($calculatedDistance);
}

相关免费学习推荐：php编程（视频）

热心网友 时间：2022-04-06 02:39

这篇文章主要介绍了PHP多态代码实例,本文用2个代码实例来演示PHP中的多态,需要的朋友可以参考下
多态定义：只关心一个接口或者基类，而不关心一个对象的具体类。（同一类型，不同结果）
这里两个例子：
第一个，我们发现，基类定义了标准，子类进行了自我规则的实现。这是多态的一个要求。同时，这是满足重写；实际上这是不同类的不同表现；没有严格满足一个接口，或者基类编程。因为你调用的时候不是
stu-showGrade()
而是各自自己的方法；
?
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class
stu{
public
function
showGrade(){
echo
base
class;
}
}
class
xiaomin
extends
stu{
public
function
showGrade(){
echo
is
son
show
80;
}
}
class
xiaoli
extends
stu{
public
function
showGrade(){
echo
is
son
show
60;
}
}
function
doit($obj){
if(get_class($obj)
!=
stu){
$obj-showGrade();
}
}
doit(new
xiaoli());
doit(new
xiaomin());
第二个例子：dovoice
参数规定了$obj
为animal，意识就是用接口
接受了
实现类对象。了向上转型。这就符合同一类型，不同结果了，这就是多态；
实际上在Java中
会是
animal
a
=
new
dog()；这样子的；因为PHP
是若类型语言。没有对象转型机制。
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interface
animal{
public
function
voice();
}
class
cat
implements
animal{
public
function
voice(){
echo
miao~~~br;
}
}
class
dog
implements
animal{
public
function
voice(){
echo
wang
~~~br;
}
}
function
dovoice(animal
$obj){
$obj-voice();
}
dovoice(new
dog());
dovoice(new
cat());