PHP echo & Print, PHP Comments

Difference between echo and print in PHP
  —PHP echo and print both are PHP Statement.

   Both are used to display the output in PHP.

—echo is a statement i.e used to display the output. It can be used with parentheses echo( ) or without parentheses echo.

—echo is faster then print

—Using echo can pass multiple string seperated as ( , )

—echo doesn’t return any value

Examples

//echo

          <?php

         $name="Ravi";

         echo $name;

           //or

            echo ($name);

              ?>

     Output: Ravi

—

//print

      <?php

        $name="Ravi";

          print $name;

          //or

            print ($name);

        ?> 

Output: Ravi

Pass multiple argument

//echo

<?php

$name = "Ravi ";

$profile = "PHP Developer";

$age = 25;

echo $name , $profile , $age, " years old";

?>

Output: Ravi PHP Developer 25 years old

//print

<?php

$name = "Ravi ";

$profile = "PHP Developer";

$age = 25;

print $name , $profile , $age, " years old";

?>

Output: Parse error: syntax error

Check return type—

//echo

<?php

$name = "Ravi ";

$ret = echo $name;

echo $ret;

?>

Output: Parse error: syntax error, unexpected T_ECHO

//print

<?php

$name = "Ravi ";

$ret = print $name; //To test it returns or not

print $ret;

?>

Output: Ravi

Comments in php

—A comment is non-executable lines. comment is used to write description  for your own understanding.

—Browser doesn’t read the comments.

There are two types of comments used in php:-

  1. Single line comments

  2. Multi-lines comments 

Single line comment

Single line comment used for short explanations.Declaration of Single line comment are two types. Either Begin with(#) Or backslash(//)

Example:-

<?php

  # This is the single line comment

  # This is the next line comment

  // This is also a single line comment.

?>

In the above Example

—First and second line comments begin with hash(#).

—The third one is begin with(//).

If we check the output of the given example.
Browser show blank page. Beacuse comments are always non-executable..

Multi lines comments

Multi lines comments  used to comment multiple lines. Here we can give comments in bulk. The bulk comments are enclose within (/*…..*/)

Example:-

<?php

/* This is a comment with multiline

  Company :HCL-CDC

  view: Multiline Comments Demo

*/

?>

The all lines which is define in php environment are Multiline comments, it is non-executable. Because it enclose with Multiline comments statement.

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