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PHP7.1的几个新特性

作者：互联网

1、try catch 支持捕获多个异常

  1. #写代码的时候不免要自定义异常，以前捕获多个异常需要这样写
  2. try{
  3. ...
  4. }catch(myException $e) {
  5. ...
  6. }catch(anotherExcpetion $e) {
  7. ...
  8. }catch(Exception $e) {
  9. ...
  10. }
  13. #php7.1可以这么写了
  15. try{
  16. ...
  17. }catch(myException | anotherException $e) {
  18. ...
  19. }catch(Exception $e) {
  20. ...
  21. }
#写代码的时候不免要自定义异常，以前捕获多个异常需要这样写

try{

...

}catch(myException $e) {

...

}catch(anotherExcpetion $e) {

...

}catch(Exception $e) {

...

}


php7.1可以这么写了


try{

...

}catch(myException | anotherException $e) {

...

}catch(Exception $e) {

...

}

 

1、class 支持常量的可见性设置

  1. #以前的类里面的常量不可以设置可见性，例如
  2. class MyClass
  3. {
  4. protected $orderArr;
  5. private $key;
  6. const OUT_TIME = 1000; #这里不能添加修饰
  7. }
  9. #现在你可以为const设置可见性了
  11. class MyClass
  12. {
  13. public $name
  14. protecte $orderArr;
  15. private $key;
  16. protected const OUT_TIME = 1000; #这里可以设置可见性了
  17. }
#以前的类里面的常量不可以设置可见性，例如

class MyClass

{

protected $orderArr;

private $key;

const OUT_TIME = 1000; #这里不能添加修饰

}


现在你可以为const设置可见性了


class MyClass

{

public $name

protecte $orderArr;

private $key;

protected const OUT_TIME = 1000;  #这里可以设置可见性了

}

 

3、多变量同时赋值

 

4、放弃mcrypt扩展

  1. #以前用mcrypt写一个加密大概是这样
  3. public function encryptData($str, $key)
  4. {
  5. $block = mcrypt_get_block_size('des', 'ecb');
  6. $pad = \(block - </span><span class="br0">(</span><span class="kw1">strlen</span><span class="br0">(</span><span class="">\)str) % $block);
  7. \(str .= </span><span class="kw1">str_repeat</span><span class="br0">(</span><span class="kw1">chr</span><span class="br0">(</span><span class="">\)pad), $pad);
  8. $res = mcrypt_encrypt(MCRYPT_DES, $key, \(str, MCRYPT_MODE_ECB</span><span class="br0">)</span><span class="">;</span></li><li class=" odd"><span class=""> return </span><span class="kw1">strtoupper</span><span class="br0">(</span><span class="kw1">bin2hex</span><span class="br0">(</span><span class="">\)res));
  9. }
  11. #现在你需要用openssl来替换了
  13. public function encryptData($str, $key)
  14. {
  15. \(res = </span><span class="kw1">openssl_encrypt</span><span class="br0">(</span><span class="">\)str, 'DES-ECB', \(key, OPENSSL_RAW_DATA</span><span class="br0">)</span><span class="">;</span></li><li class=" odd"><span class=""> return </span><span class="kw1">strtoupper</span><span class="br0">(</span><span class="kw1">bin2hex</span><span class="br0">(</span><span class="">\)res));
  16. }
  19. #以前用mcrypt写一个解密大概是这样
  21. public function decryptData($str, $key)
  22. {
  23. \(str = </span><span class="kw1">strtolower</span><span class="br0">(</span><span class="">\)str);
  24. $str = pack('H', $str);
  25. $decrypted = mcrypt_decrypt(MCRYPT_DES, $key, $str, MCRYPT_MODE_ECB);
  26. \(dec_s = </span><span class="kw1">strlen</span><span class="br0">(</span><span class="">\)decrypted);
  27. \(padding = </span><span class="kw1">ord</span><span class="br0">(</span><span class="">\)decrypted[$dec_s - 1]);
  28. \(decrypted = </span><span class="kw1">substr</span><span class="br0">(</span><span class="">\)decrypted, 0, -$padding);
  29. return \(decrypted;</span></li><li class=" even"><span class=""></span><span class="br0">}</span><span class=""></span></li><li class=" odd"><span class=""></span></li><li class=" even"><span class=""></span></li><li class=" odd"><span class=""></span><span class="co1">#现在也要用openssl替换了</span><span class=""></span></li><li class=" even"><span class=""></span></li><li class=" odd"><span class="">public function </span><span class="kw1">decryptData</span><span class="br0">(</span><span class="">\)str, $key)
  30. {
  31. \(str = </span><span class="kw1">strtolower</span><span class="br0">(</span><span class="">\)str);
  32. $str = pack('H', $str);
  33. \(decrypted = </span><span class="kw1">openssl_decrypt</span><span class="br0">(</span><span class="">\)str,'DES-ECB', $key,OPENSSL_RAW_DATA);
  34. return $decrypted;
  35. }
#以前用mcrypt写一个加密大概是这样


public function encryptData($str, $key)

{

$block = mcrypt_get_block_size('des', 'ecb');

$pad = \(block - (strlen(\)str) % $block);

\(str .= str_repeat(chr(\)pad), $pad);

$res = mcrypt_encrypt(MCRYPT_DES, $key, \(str, MCRYPT_MODE_ECB);
    return strtoupper(bin2hex(\)res));

}


现在你需要用openssl来替换了


public function encryptData($str, $key)

{

\(res = openssl_encrypt(\)str, 'DES-ECB', \(key, OPENSSL_RAW_DATA);
    return strtoupper(bin2hex(\)res));

}


以前用mcrypt写一个解密大概是这样


public function decryptData($str, $key)

{

\(str = strtolower(\)str);

$str = pack('H*', $str);

$decrypted = mcrypt_decrypt(MCRYPT_DES, $key, $str, MCRYPT_MODE_ECB);

\(dec_s = strlen(\)decrypted);

\(padding = ord(\)decrypted[$dec_s - 1]);

\(decrypted = substr(\)decrypted, 0, -$padding);

return $decrypted;

}


现在也要用openssl替换了


public function decryptData($str, $key)

{

\(str = strtolower(\)str);

$str = pack('H*', $str);

\(decrypted = openssl_decrypt(\)str,'DES-ECB', $key,OPENSSL_RAW_DATA);

return $decrypted;

}

5、算术运算中警告无效的字符串

  1. # 以前可以这样
  2. \(num = </span><span class="nu0">1</span><span class=""> + </span><span class="st0">'abc323vccc'</span><span class="">; </span><span class="co1"> //result 1;</span><span class=""></span></li><li class=" odd"><span class="">\)num = 1 +'100abc'; //result 101;
  5. #现在你不能那样写了，将会得到这样的一个警告
  6. PHP warning: A non-numeric value encountered on line 1
# 以前可以这样

\(num = 1 + 'abc323vccc';    //result 1;
\)num = 1 +'100abc';    //result 101;


现在你不能那样写了，将会得到这样的一个警告


PHP warning:  A non-numeric value encountered on line 1

 

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标签：decrypted,key,...,几个,特性,PHP7.1,str,catch,mcrypt
来源： https://www.cnblogs.com/samRoot/p/14207987.html