My first PHP program

My first PHP program "; //Variable declaration $variable = 73; echo "$variable
"; //Constant definition define("ludolf", 3.14, true); echo ludolf."
"; //String connecting $part1 = "BO"; $part2 = "O!"; echo $part1.$part2."
"; //Other data types $variable = false; $variable = 8.544; //Global variable vs local variable $important = "You can access me anywhere in this program."; function func(){ global $important; //echo $variable."
"; //Throws an error echo $important."
"; } func(); //Variable variables $varvar = 'part2'; echo $$varvar."
"; //Arithmetic operators echo $variable + ($variable - 3.088)."
"; echo $variable * ($variable / 4.272)."
"; echo 48 % 5 ."
"; //Assignment operators $variable = 3; echo $variable++ ." - ". ++$variable ." - ". $variable-- ." - ". --$variable . "
"; echo $variable += 2; echo "
"; //Logical and comparison operators echo ($variable < 10 and ludolf > 0)."
"; echo ($variable < 10 or ludolf == 3)."
"; echo ($variable >= 10 || ludolf === 3.14)."
"; echo ($variable !== 5 && ludolf <> 3.1)."
"; //False -> no output -> empty line echo ($variable != 3 xor ludolf == 3.15)."
"; //Numeric array $chars = array("a","b","c"); $chars[1] = "d"; echo $chars[1]."
"; //Associative array $scores = array("Ian" => 57, "Tycho" => 64, "Dogmeat" => 81); $scores['Tandi'] = 38; echo $scores['Tandi']."
"; //Multidimensional array $playground = array(array("nobody", "Amy", "John"),array("Lisa", "Kumio", "nobody"),array("Mike", "nobody", "nobody")); echo $playground[1][0]."
"; //If, Elseif, Else statements if($playground[1][1] == "nobody"){echo "Middle of the playground is empty"."
";} elseif ($playground[1][1] != "null"){echo "In the middle of the playground is ".$playground[1][1]."
";} else {echo "Error"."
";} //While loop while ($variable > 0){echo $variable." - "; $variable--;} echo "0"."
"; //Do-While loop do { echo $variable." - "; $variable++; }while ($variable<=8); echo "9"."
"; //For loop for ($variable = 0; $variable < 19; $variable += 2){ echo $variable." - "; } echo $variable."

Children on the playground:
"; //Foreach loop (in multidimensional array) foreach ($playground as $variable){ foreach ($variable as $part1){ echo $part1." "; } echo "
"; } echo "
"; //Switch statement $variable = 'Friday'; switch($variable){ case 'Monday': echo "Ow crap monday again!
"; break; case 'Friday': echo "Wohoo! Weekend ahead!
"; break; case 'Saturday': case 'Sunday': echo "Weekend is great!
"; break; default: echo "Another working day, another day of doing usless stuff.
"; } //Break statement for ($variable = 0; $variable >=0; $variable++){ if ($variable == 30){break;} echo $variable." - "; } echo "30"."
"; //Continue statement while ($variable >= 10){ $variable--; if ($variable % 3 == 0){continue;} echo $variable." - "; } echo "8"."
"; //Included and required source files (not working in Sololearn) /* include 'counter.php'; require 'welcome.php'; */ //Functions function resetVariable($param){ $param = null; return $param; } echo $variable." -> "; $variable = resetVariable($variable); echo $variable."
"; //Empty variable -> no output ?>

PHP course - code examples for all lessons