Learn PHP online:PHP Day-7

Comments in PHP Code

Comments in PHP Code

Comments are used to stop the execution of a line or set of lines script.

“//,#” are comes under single line comments.
“/*,*/” are comes under multiple lines comments.

Ex:

<?php
echo "Hello World!"; // This will print out Hello World!
echo "<br />Psst...You can't see my PHP comments!"; // echo "nothing";
// echo "My name is Humperdinkle!";
# echo "I don't do anything either";
?>

Isset: This function is used to check the variable is set with any value or not.

Ex:

<?php
$x=100;
$sno;
echo isset($x);
echo isset($no);
?>

Unset: This function unsets a variable value.

Ex:

<?php
$x=100;
unset($x);
?>

Ini_get: By using this function we can get the configuration directive values. And Also we can change the configuration directive values.

<?php
echo ini_get("precision");
ini_set("precision",16);
echo ini_get("precision");
?>

Note: In php dot(.) is an operator used to concatenate two values.

Ex:

                   <?php

                       $x=100;

                       $y=200;

                       echo $x.$y;

                    ?>

Note: In PHP “@” is an operator used to hide the errors.

Ex:

<?php
@fun1();
echo "next";
?>