Function

The syntax of function is very similar to Javascript:

<?php
  function abc() {
      echo "I love PHP";
  }

  echo "Hello, World <br />";
  abc();
?>

The output is:

Hello, World
I love PHP

You can put any PHP code into the function block. But you should keep in mind, to use a function, you must call functin name with "()". In the above the sample, we call the function:

abc();

We can pass parameters to a function:

<?php
function abc($count, $msg = "I love PHP") { 
for($i = 0; $i < $count; $i++){ 
echo $msg . "<br />"; 
} 
} 

abc(5);

The output is that the value of $msg "I love PHP" will be displayed for 5 times.

We can use the return statements to assign a variable's value based on the results of the execution of a particular function. For example:

<?php
  function compareNum($v1, $v2) {
   if($v1 > $v2) {
    return "Yes";
   } else {
    return "No";
   }
  ?>

  $anwser = compareNum(8, 10);
  echo "Is 8 greater than 10? -- $answer!";
?>

The output will be:

Is 8 greater than 10? -- No!