pratice_array_func.php

<?php
/**
 * ------------------------------------------------------------------------------------------
 * Pratice array_columns, array_map, array_filter
 * ------------------------------------------------------------------------------------------ 
 *
 * Simple and stupid but in OOP way to clear my concepts about some useful array functions.
 */


/**
 * display subject
 */

function display($sub) {
	foreach ($sub as $sub):
	echo 'i hope, i can pass: <b>'.$sub.'</b>.<br />';
	endforeach;
}

/**
 * var dump function
 */

function dd() {
	var_dump(func_get_args());
	die;
}


/**
 * class name
 */
class ExamsPreparation
{
	/**
	 * subjects list
	 * @var Array
	 */
	public $subjects;

	/**
	 * do i have any hope that i can clear those given subjects?
	 * @var bool
	 */
	public $canClear;

	public function __construct(Array $subjects, Bool $canClear)
	{
		$this->subjects = $subjects;
		$this->canClear = $canClear;
	}

}

/**
 * Exams Preparation object list
 * 
 * @var array
 */
$list = [
	new ExamsPreparation(['Urdu', 'Computer'], true),
	new ExamsPreparation(['Physics', 'English'], true),
	new ExamsPreparation(['Computer', 'Islamiyat'], true),
	new ExamsPreparation(['Math'], false)
];


/**
 * Array filter to return only "True" conditions
 * @var array
 */
$chanceToClear = array_filter($list, function ($d) {
	return $d->canClear;
});


/**
 * Use Array columns to get only those subjects list :p which can be clear.
 * @var array
 */
$getSubjects = array_column($chanceToClear, 'subjects');

/**
 * Array Map to call function to echo out subjects.
 */
array_map('display', $getSubjects);