https://quicktasks.ismael.casimpan.com/tags/php-coding/Recent content in php-coding on IT QuicktasksHugo -- gohugo.ioCopyright © 2018–2022, Ismael Casimpan Jr.; All Rights ReservedSat, 26 Mar 2022 00:20:25 +0800https://quicktasks.ismael.casimpan.com/post/excel-readable-csv/Sat, 26 Mar 2022 00:20:25 +0800https://quicktasks.ismael.casimpan.com/post/excel-readable-csv/ Yes, csv is simple BUT if you want it readable in Excel (at least on Windows), you need to prepend it with a hidden BOM and as UTF8. Tried every possible suggestions in stackoverflow that says it works BUT it doesn't. So, try the phpoffice approach. It works for me... Install 1~$ cd /an/isolated/directory 2~$ composer require php-office/phpspreadsheet 3~$ composer install Try this code: 1<?php 2require 'vendor/autoload.php'; 34use PhpOffice\PhpSpreadsheet\Spreadsheet; 5use PhpOffice\PhpSpreadsheet\Writer\Csv; 678const CSV_FILENAME='csv-example.https://quicktasks.ismael.casimpan.com/post/php-anonymous-function/Sat, 12 Mar 2022 00:20:25 +0800https://quicktasks.ismael.casimpan.com/post/php-anonymous-function/ Overview In contrast to a named function like: 1<?php 2function multiply($x, $y) 3{ 4return $x * $y; 5} An anonymous or unnamed-function, well has no name: 1<?php 2function ($x, $y) { 3return $x * $y; 4}; //closing semicolon here is mandatory. NOTE: semicolon after the closing curly bracket is mandatory as it is treated as an expression by php Since it is unnamed, you need to store it's value in a variable and using the variable as function name:https://quicktasks.ismael.casimpan.com/post/php-array_map-function/Sat, 12 Mar 2022 00:20:25 +0800https://quicktasks.ismael.casimpan.com/post/php-array_map-function/ Suppose that you have an array that holds the lengths of squares: 1<?php 23$lengths = [10, 20, 30]; To calculate the areas of the squares, you may come up with the foreach loop like this: 1<?php 23$lengths = [10, 20, 30]; 45// calculate areas 6$areas = []; 78foreach ($lengths as $length) { 9$areas[] = $length * $length; 10} 1112print_r($areas); Output: 1Array 2( 3[0] => 100 4[1] => 400 5[2] => 900 6) Using array_map() 1<?https://quicktasks.ismael.casimpan.com/post/php-callable-function/Sat, 12 Mar 2022 00:20:25 +0800https://quicktasks.ismael.casimpan.com/post/php-callable-function/ Callbacks can be denoted by the "callable" type declaration. Example: 1icasimpan$ nl -ba callable_example.php 21 <?php 32 function printFormatted(callable $format, $str) { 43 echo $format($str); 54 echo "<br>"; 65 } 76 87 function exclaim($str) { return $str . "!"; } 98 printFormatted("exclaim", "Hello World"); 109 ?> This outputs "Hello World!". Line 7 is the callable function "exclaim" Line 2 is the function "printFormatted" with callable function parameter Line 8 triggers the function "printFormated" which basically pass the name 'in plain string' with the parameter "Hello World" NOTEShttps://quicktasks.ismael.casimpan.com/post/php-iterable/Sat, 12 Mar 2022 00:20:25 +0800https://quicktasks.ismael.casimpan.com/post/php-iterable/ An iterable is any value which can be looped through with a foreach() loop. The iterable pseudo-type was introduced in PHP 7.1, and it can be used as a data type for function arguments and function return values. Example 1<?php 2function printIterable(iterable $myIterable) { 3foreach($myIterable as $item) { 4echo "{$item}\n"; 5} 6} 78$arr = ["a", "b", "c"]; 9printIterable($arr); 10?> This prints: 1a 2b 3c Return an iterable: 1<?php 2function getIterable():iterable { 3return ["a", "b", "c"]; 4} 56$myIterable = getIterable(); 7foreach($myIterable as $item) { 8echo $item; 9} 10?https://quicktasks.ismael.casimpan.com/post/php-variable-variables/Sat, 12 Mar 2022 00:20:25 +0800https://quicktasks.ismael.casimpan.com/post/php-variable-variables/ This is quite confusing but as soon as you see the logic, it would make sense. Say you have this code: 1<?php 23$my_var= 'title'; 4$$my_var = 'PHP variable variables'; // $my_var has a value of 'title'. So the 2nd '$' makes it $title 5echo $title; // ...so, YOU see now where you will get the variable $title Output is: 1PHP variable variables See details in https://www.phptutorial.net/php-tutorial/php-variable-variables/https://quicktasks.ismael.casimpan.com/post/php-data-structure/Wed, 02 Mar 2022 00:20:25 +0800https://quicktasks.ismael.casimpan.com/post/php-data-structure/ There's what is called a "Data Structure" or DS package available in packagist. Install 1~$ cd /an/isolated/directory 2~$ composer require php-ds/php-ds 3~$ composer install Try this code: 1<?php 2require __DIR__ . '/vendor/autoload.php'; 345$stack = new \Ds\Stack(); 6//$stack = new Stack(); 78$stack->push("a"); 9$stack->push("b"); 10$stack->push("c"); 1112var_dump($stack->pop()); 13var_dump($stack->pop()); 14var_dump($stack->pop()); 15?> See https://www.php.net/manual/en/book.ds.php or https://medium.com/@rtheunissen/efficient-data-structures-for-php-7-9dda7af674cdhttps://quicktasks.ismael.casimpan.com/post/php-arrow-function/Mon, 21 Feb 2022 00:20:25 +0800https://quicktasks.ismael.casimpan.com/post/php-arrow-function/ As of php7.4, php arrow function was added as a more concise syntax for anonymous functions. Basic syntax: 1fn (arguments) => expression; Is functionally equivalent to the following anonymous function: 1function(arguments) { return expression; } Unlike anonymous functions, arrow functions can automatically access variables from their parent scopes. 1<?php 23function multiplier($x) 4{ 5return fn ($y) => $x * $y; 6} 78$double = multiplier(2); 910echo $double(10); // 200 See also https://ismael.casimpan.com/quicktasks/php-anonymous-function/