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Articles on Trending Technologies
Technical articles with clear explanations and examples
How can we load a source code into JShell in Java 9?
JShell is an interactive tool for learning Java, and it is a REPL(Read-Evaluate-Print-Loop) that evaluates declarations, statements, and expressions.While leaving a JShell session, we want to reuse the code previously entered into a new session. This can be done by using the command: /open [File_Path]. This command will load all code and internal commands found in file[File_Path] supplied as an option.In the below code snippet, we can use the "/open [File_Path]" command to load source code from the directory with the ".jsh" extension.C:\Users\User>jshell | Welcome to JShell -- Version 9.0.4 | For an introduction type: /help intro jshell> ...
Read MoreHow to install Imagick/imagemagick PHP extension on Windows 10?
To install Imagick or Imagemagick on windows, follow the below mentioned procedure −Check the permissions on the .dll file. This will make sure that the Apache user has read access to the file.It is better to change the permission of the [PHP]/extension directory.In order to change the permission, follow the below steps −Right click on the file(s) or folder(s)Select "Properties"Select the "Security" tabClick on "Edit" button.Change the permission of user to Full Control.
Read MoreGetting size in memory of an object in PHP?
The memory_get_usage() function can be caked before and after allocating memory to the class created.class MyBigClass { var $allocatedSize; var $allMyOtherStuff; } function AllocateMyBigClass() { $before = memory_get_usage(); $ret = new MyBigClass; $after = memory_get_usage(); $ret->allocatedSize = ($after - $before); return $ret; }Output will be the memory of object with respect to the environment setup.
Read MorePHP Call methods of objects in array using array_map?
In PHP version 5.3, methods of objects in array can be called using the below code −$props = array_map(function($obj){ return $obj->getProp(); }, $objs);This will be slower than a ‘for’ loop since it invokes one function for every element −function map($obj) { return $obj->getProperty(); } $props = array_map('map', $objs);Alternatively, for PHP versions before 5.3, the below code can be used −function map($obj) { return $obj-> getProperty (); } $props = array_map('map', $objs); }The getProperty function will be called on all the objects and the specific property is displayed. Alternative −function encode_data($val){ if(is_array($val)){ return $val = ...
Read MorePHP equivalent of friend or internal
PHP doesn't support friend-like declarations. It can be simulated in PHP5 using the __get and __set methods and by inspecting a backtrace for the allowed friend classes. But this type of coding practice is considered to be clumsy −class sample_friend { private $__friends = array('My_Friend', 'Other_Friend'); public function __get($key) { $trace = debug_backtrace(); if(isset($trace[1]['class']) && in_array($trace[1]['class'], $this->__friends)) { return $this->$key; } // __get() code goes here trigger_error('Cannot access private property ' . __CLASS__ . '::$' . $key, E_USER_ERROR); ...
Read MoreHow do I include a php.ini file in another php.ini file?
The .ini files from the main php,ini file can’t be included. Instead, while compiling PHP, the line--with-config-file-scan-dir=PATH can be added.The ‘PATH’ in the above line refers to the location where the configuration file is to be scanned.During compile time, PHP will look for each and every .ini file in that specific directory, apart from searching in the normal php.ini file.
Read MoreTracking Memory Usage in PHP
The memory_get_usage function can be used to track the memory usage. The ‘malloc’ function is not used for every block required, instead a big chunk of system memory is allocated and the environment variable is changed and managed internally.The two different types of memory usages are −The memory required by the engine from OS (the real usage)The amount of memory that was actually used by the application (internal usage)The above mentioned memory usage can be tracked using memory_get_usage(). This function returns both real and actual memory used depending on our requirement.For example: if we are looking at specific code snippets, ...
Read MoreHow to read a single file inside a zip archive with PHP
To read a single fine inside z zip archive, the code is as follows −$handle = fopen('zip://test.zip#test.txt', 'r'); $result = ''; while (!feof($handle)) { $result .= fread($handle, 8192); } fclose($handle); echo $result;The output will be the contents of the zip file.
Read MorePHP_CodeSniffer, PHPMD or PHP Depend
pdependThe function pdepend is used to generate a large set of software metrics from a given code base. The generated values can be used to measure the quality of a software project. They help in identifying the parts of an application where refactoring is required.phpmdThe phpmd scans the PHP source code and searches for potential problems that could be possible bugs, not-so-optimal code, or overcomplicated expressions.phpcsThe phpcs function tokenises the PHP, JavaScript and CSS files and figures out issues/violations in a set of pre-defined coding standards. It ensures that the code remains consistent and neat. It also helps in preventing ...
Read MoreHow to sort the output in PowerShell?
To sort the output in the PowerShell you need to use Sort-Object Pipeline cmdlet. In the below example, we will retrieve the output from the Get-Process command and we will sort the, according to memory and CPU usage.ExampleGet-Process | Sort-Object WorkingSet | Select -First 10OutputHandles NPM(K) PM(K) WS(K) CPU(s) Id SI ProcessName ------- ------ ----- ----- ------ -- -- ----------- 0 0 60 8 0 ...
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