【转】PHP5.3亲测精华特性整理
1、引入 __DIR__ magic常量 定位脚本的目录
echo __DIR__."|".dirname(__FILE__);
2、允许从2个值的or/and表达式快速的获取一个非空的值
echo (1 ?: 0) ."|". ("" ?: 0)."|". var_export(array() ?: array(1), true);
3、类添加__callStatic方法,等价于 __call(),但它是为调用静态方法准备的。下面来看示例:
class xxx{ function __call($func, $args){ echo "function name:".$func; echo "</br />"; echo "args:".var_export($args, true); } static function __callStatic($func, $args){ echo "static function name:".$func; echo "</br />"; echo "static args:".var_export($args, true); } } $x = new xxx(); $x->testfunc("oo"); echo "</br />"; xxx::teststatic("xx");
4、动态的调用静态的方法
class xx{ static function test(){ echo __METHOD__; } } $c = "xx"; $m = "test"; $c::$m();
5、延迟静态绑定(静态处理从编译时延迟到执行时)
class A{ static function whoami(){ echo __CLASS__; } static function say1(){ self::whoami(); } static function say2(){ static::whoami(); } } class B extends A{ static function whoami(){ echo __CLASS__; } } class C extends A{ static function whoami(){ echo __CLASS__; } } B::say1(); C::say2();
6、MySQLInd (高速的专门为PHP设计的MySQL调用库接口)
7、INI Magic
8、扩展的 OpenSSL 函数
9、SPL(Standard PHP Library) 优化
10、时间处理进行扩展了和添加
$date = strtotime("11-05-17 00:00:00"); echo date("Y-m-d", $date)."|"; $date = date_create_from_format("y-m-d", "11-05-17"); echo $date->format("Y-m-d");
11、垃圾回收器(为复杂和长时间运行脚本的执行结束周期释放内存的清理)
gc_enable(); // 允许垃圾回收 var_dump(gc_enabled()); // true var_dump(gc_collect_cycles()); // 某个元素的清理 gc_disable(); // 禁止垃圾回收
12、NOWDOC(不对HEREDOC进行转译)
$fubar = "xxx"; $xbar = <<<ONE this is HEREDOC $fubar ONE; $abar = <<<'TWO' this is NOWDOC $fubar TWO; echo $xbar."|".$abar;
13、匿名函数体验
$ofun = create_function('$a, $b', 'return $a*$b;'); //不要忘了分号,传统方法 echo $ofun(2, 5); $nfun = function ($a, $b){ return $a*$b; };//不要忘了分号,现代方法 echo $nfun(3, 5);
14、闭包体验
$arr = array(1, 2, 3, 5, 6, 7); $res = array_filter($arr, function($v) { return $v >4; }); var_dump($res); function countnum(){ $num = 0; $testt = function() use(&$num){ ++$num; echo $num; }; return $testt; } $t = countnum(); $t(); $t();
15、命名空间
namespace xxx; //第一个namespace需要在所有输出之前 function t(){ return __NAMESPACE__; } namespace xxx; function t(){ return __NAMESPACE__; } echo \xx\t()."|"; echo \xxx\t();

What’s still popular is the ease of use, flexibility and a strong ecosystem. 1) Ease of use and simple syntax make it the first choice for beginners. 2) Closely integrated with web development, excellent interaction with HTTP requests and database. 3) The huge ecosystem provides a wealth of tools and libraries. 4) Active community and open source nature adapts them to new needs and technology trends.

PHP and Python are both high-level programming languages that are widely used in web development, data processing and automation tasks. 1.PHP is often used to build dynamic websites and content management systems, while Python is often used to build web frameworks and data science. 2.PHP uses echo to output content, Python uses print. 3. Both support object-oriented programming, but the syntax and keywords are different. 4. PHP supports weak type conversion, while Python is more stringent. 5. PHP performance optimization includes using OPcache and asynchronous programming, while Python uses cProfile and asynchronous programming.

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

PHP originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.

PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

PHP remains important in the modernization process because it supports a large number of websites and applications and adapts to development needs through frameworks. 1.PHP7 improves performance and introduces new features. 2. Modern frameworks such as Laravel, Symfony and CodeIgniter simplify development and improve code quality. 3. Performance optimization and best practices further improve application efficiency.

PHPhassignificantlyimpactedwebdevelopmentandextendsbeyondit.1)ItpowersmajorplatformslikeWordPressandexcelsindatabaseinteractions.2)PHP'sadaptabilityallowsittoscaleforlargeapplicationsusingframeworkslikeLaravel.3)Beyondweb,PHPisusedincommand-linescrip

PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.


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