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Intro to PHP

This guide serves as an introduction to PHP for developers transitioning from Java or C. You will learn how to create a simple PHP file and execute PHP code using an interpreter like XAMPP. Key concepts include variable handling, string concatenation, conditionals, arrays, and loops with practical examples. The guide also provides handy coding hints, such as using modulus and ternary operators, enhancing your PHP coding skills. Whether you're building web pages or applications, this introduction will equip you with essential PHP knowledge.

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Intro to PHP

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  1. Intro to PHP Coming from Java or C

  2. How to Write PHP • Get a PHP file (myfile.php) • Add a PHP tag <?php echo “Hello World”; ?> • Run with a PHP interpreter (XAMPP is good for Windows)

  3. Variables • Declaration not necessary • Variables have no type • All variables are preceded by a dollar sign $myVariable = 1;$myVariable = “Hello”; for($i = 0; $i < 22; $i++) { echo $i;}

  4. String Concatenation • PHP likes to be unique • It likes to use periods instead of pluses$hello = “Hello ”; $world = “World”; echo $hello . $world; echo “Hello ” . “World”;

  5. Conditionals • Just like C and Java … CAKE$condition = true; if($condition && 1 == 1) { echo “Whoohoo”; } else { echo “How did this happen?”; }

  6. Arrays $numbers = array(); $numbers[] = 1; // pushes integer 1 onto array $numbers[] = 2; // pushes integer 2 onto array sizeof($myArray); // returns length of array print_r($myArray); // prints the array for you

  7. Loops • Same for loop as before (while loops work too! WOW!) • Introducing the for each loop: foreach($numbers as $number) { echo “My number is ” . $number; }

  8. Some Coding Hints • Modulus • $i % 10 == 0 if $i is divisible by 10 • $isEven = ($i % 2 == 0); • $isEven = !($i%2); // same thing but shorter • Ternary Operators • echo isEven ? “It’s Even!” : “It’s Not”;

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