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Wiktor Liszkiewicz
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Blog Posts:
PHP Linked List with end and start List Node pointers
<?php class ListNode { public $data = NULL; public $next = NULL; function __construct(string $data = NULL) { $this->data = $data; } } class LinkedList { private $_firstNode = NULL; private $_lastNode = NULL; private $_totalNodes = 0; function insert(string $data =...
PHP float number not add up
Why my numbers are not equal PHP? Floating point precision Floating point numbers have limited precision. Although it depends on the system, PHP typically uses the IEEE 754 double precision format, which will give a maximum relative error due to rounding in the order...
Division in PHP
Do we still need intdiv() since PHP 8.0 / operator supports error throwing when dividing by 0? intdiv(10, 3) == 3;intdiv(-10, 3) == -3; (int)(10 / 3) == 3;(int)(-10 / 3) == -3; floor(10/3) == 3;floor(-10/3) == -4; <?php $start1 = microtime(true); $i = 1; while ($i...
PHP division by 0
Divide by 0 in PHP How the division by 0 behave in PHP8, PHP7, PHP5 PHP has evolved in the last few years. Before when dividing by 0 we only get a warning. This behaviour did not change until php8, where numeric division 10 / 0 resulted in rasing an Error...
PHP one directional linked list
To create a list, we need to declare two classes, List Node and Linked List classes. Basic PHP one directional linked list PHP Linked list and its methods <?php class ListNode { public $data = NULL; public $next = NULL; function __construct(string $data = NULL) {...
Overriding and overloading methods in PHP
Overriding methods in PHP Overriding and overloading messages in PHP can be a little weird! There are things that will work ant stuff which will not. For example, this method overriding will work: <?php class A { function test(string $s) { echo "$s"; } } class B...
Why we love PHP 7?
Things to remember why PHP 7 is great. In PHP 7.0: New features:https://www.php.net/manual/en/migration70.new-features.phpDepreciated featureshttps://www.php.net/manual/en/migration70.deprecated.php PHP Sandbox online here Catch errors! We can catch errors or...
Convert windows path to WSL path format
Let say that we want to cd to a windows explorer directory and we don't want manually to rewrite all the backslashes. We could write a bash cmd which does just that. cd $(echo 'C:\laragon\www\docker\phpfpm-mysql-nginx' | sed 's/\\/\//g' | sed 's/C:/\/c/g') Outputs:...
Query location with in a radius
Step by step radial location querying with MongoDB MongoDB is great for computing geolocation using geospatial data Basicaly you use `$geoWithin:` with `$centerSphere:` on collection with **2dsphere** index. But lets go step by step. Scenario: Lets pretend a user is...
What should you know as a PHP developer?
As PHP developer, you need to know some common concepts and techniques that help you to write better code and provide solid solutions. It is also important to implement the right tools for the job. Tooling, development practices and development process methodology. If...
Update WordPress website manually
If you can not access the dashboard, you can perform WordPress manual update. Incompatibility of old site with new PHP version is a common issue. Updating your site manually can help you to resolve it. To make manual update / upgrade you need to access FTP / SSH or...
Troubleshoot network connection with ping and tracert/tracerout (Windows/Linux/Mac)
If you think that your network connection have an issue, and you don't know what cause the issue, you can run some simple commands to exclude some common problems. If you think that the problem is caused by your network card, you can run a simple ping command against...
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