Abstract: This article comes from the official PHP documentation. It will not be expanded here. It is given to interested friends as a research list. PHP 5.3 https://secure.php.net/manual... Added namespace support. Added static late binding support. Added jump tag support. Added native closure (Lambda/anonymous function) support. ...
This article comes from the official PHP documentation. It will not be expanded here. It is given to interested friends as a research list.
PHP 5.3
https://secure.php.net/manual...
-
Added namespace support.
Added static late binding support.
Added jump tag support.
Added native Closure (Lambda/anonymous function) support.
Added two new magic methods, __callStatic and __invoke.
Added Nowdoc syntax support, similar to Heredoc syntax, but including single quotes.
It becomes possible to initialize static variables and class properties/constants using Heredoc.
-
Double quotes can be used to declare Heredoc, which supplements the Nowdoc syntax.
The const keyword can be used outside the class to declare constants.
The ternary operator has a short form: ?:.
The HTTP stream wrapper will treat all status codes from 200 to 399 as success.
Dynamic access to static methods becomes possible.
Exceptions can be embedded.
A garbage collector for circular references has been added and is enabled by default.
mail() now supports email sending logs. (Note: Only emails sent through this function are supported.)
PHP 5.4
https://secure.php.net/manual...
Added support for traits.
New short array syntax, such as $a = [1, 2, 3, 4]; or $a = ['one' => 1, 'two' => ; 2, 'three' => 3, 'four' => 4]; .
Added support for member access analysis of arrays returned by functions, such as foo()[0].
Now closures support $this .
Now = will always be available regardless of whether the short_open_tag php.ini option is set or not.
Added access to class members during instantiation, for example: (new Foo)->bar() .
Class::{expr}() syntax is now supported.
Add binary direct value, for example: 0b001001101.
Improved parsing error messages and warnings for incompatible parameters.
SESSION extension now tracks file upload progress.
Built-in CLI mode web server for development.
PHP5.5
https://secure.php.net/manual...
-
New Generators
New finally keyword
foreach now supports list()
empty() supports any expression Formula
array and string literal dereferencing ¶
New password hashing API
Improvements GD
PHP5.6
https://secure.php.net/manual...
Use expressions to define constants
Use... operators to define variable-length parameter functions
Use ... operator for parameter expansion
Use ** for exponentiation
use function and use const
phpdbg
Default character encoding
php://input is reusable
Large file upload (can now support file uploads larger than 2GB)
GMP supports operator overloading
Use hash_equals() Compare strings to avoid timing attacks
__debugInfo()
- ##gost-crypto hashing algorithm
- SSL/TLS improvement
- pgsql asynchronous support
- Scalar type declaration
- Return value type declaration
- null merge Operator
- Spaceship operator (combination comparison operator)
- Define constant array through define()
- Anonymous class
- Unicode codepoint translation syntax ##Closure::call()
Provide filtering for unserialize()
IntlChar
Expected
-
Group use declarations
Generators can return expressions
Generator delegation
Integer division function intp()
Session options
preg_replace_callback_array()
CSPRNG Functions
You can use the list() function to expand objects that implement the ArrayAccess interface
Other features
PHP7.1
https://secure.php.net/manual...
Nullable type
Void function
Symmetric array destructuring
Class constant visibility
iterable pseudo-class
Multiple exception capture processing
list() now supports key names
Support negative string offset
ext/openssl Support AEAD
Convert callables to closed through Closure::fromCallable() Package
Asynchronous signal processing
HTTP/2 server push support in ext/curl
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php把负数转为正整数的方法:1、使用abs()函数将负数转为正数,使用intval()函数对正数取整,转为正整数,语法“intval(abs($number))”;2、利用“~”位运算符将负数取反加一,语法“~$number + 1”。

实现方法:1、使用“sleep(延迟秒数)”语句,可延迟执行函数若干秒;2、使用“time_nanosleep(延迟秒数,延迟纳秒数)”语句,可延迟执行函数若干秒和纳秒;3、使用“time_sleep_until(time()+7)”语句。

php除以100保留两位小数的方法:1、利用“/”运算符进行除法运算,语法“数值 / 100”;2、使用“number_format(除法结果, 2)”或“sprintf("%.2f",除法结果)”语句进行四舍五入的处理值,并保留两位小数。

判断方法:1、使用“strtotime("年-月-日")”语句将给定的年月日转换为时间戳格式;2、用“date("z",时间戳)+1”语句计算指定时间戳是一年的第几天。date()返回的天数是从0开始计算的,因此真实天数需要在此基础上加1。

php判断有没有小数点的方法:1、使用“strpos(数字字符串,'.')”语法,如果返回小数点在字符串中第一次出现的位置,则有小数点;2、使用“strrpos(数字字符串,'.')”语句,如果返回小数点在字符串中最后一次出现的位置,则有。

php字符串有下标。在PHP中,下标不仅可以应用于数组和对象,还可应用于字符串,利用字符串的下标和中括号“[]”可以访问指定索引位置的字符,并对该字符进行读写,语法“字符串名[下标值]”;字符串的下标值(索引值)只能是整数类型,起始值为0。

方法:1、用“str_replace(" ","其他字符",$str)”语句,可将nbsp符替换为其他字符;2、用“preg_replace("/(\s|\ \;||\xc2\xa0)/","其他字符",$str)”语句。

在php中,可以使用substr()函数来读取字符串后几个字符,只需要将该函数的第二个参数设置为负值,第三个参数省略即可;语法为“substr(字符串,-n)”,表示读取从字符串结尾处向前数第n个字符开始,直到字符串结尾的全部字符。


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