PHP echo and print Statements

PHP echo and print Statements

echo and print are more or less the same. They are both used to output data to the screen.

The differences are small: echo has no return value while print has a return value of 1 so it can be used in expressions. echo can take multiple parameters (although such usage is rare) while print can take one argument. echo is marginally faster than print. The echo statement can be used with or without parentheses: echo or echo().

Example

<?php
echo "<h2>PHP is Fun!</h2>";
echo "Hello world!<br>";
echo "I'm about to learn PHP!<br>";
echo "This ", "string ", "was ", "made ", "with multiple parameters.";
?>

The print statement can be used with or without parentheses: print or print().

Example

<?php
print "<h2>PHP is Fun!</h2>";
print "Hello world!<br>";
print "I'm about to learn PHP!";
?>

The following example shows how to output text and variables with the print statement:

<?php
$txt1 = "Learn PHP";
$txt2 = "www.shahblogs.com";
$x = 5;
$y = 4;

print "<h2>$txt1</h2>";
print "Study PHP at $txt2<br>";
print $x + $y;
?>

Constants

A constant is an identifier (name) for a simple value. The value cannot be changed during the script. A valid constant name starts with a letter or underscore (no $ sign before the constant name). 

Note: Unlike variables, constants are automatically global across the entire script.

Syntax

define(name, value, case-insensitive)

Parameters:

name: Specifies the name of the constant

value: Specifies the value of the constant

case-insensitive: Specifies whether the constant name should be case-insensitive. Default is false.

1. <?php
define("A", "Welcome to www.shahblogs.com!");
echo A;
?>

2. <?php
define("GREETING", "Welcome to www.shahblogs.com!", true);
echo greeting;
?>

3. <?php
define("GREETING", "Welcome to www.shahblogs.com!");
function myTest() 
{
    echo GREETING;
}
 myTest();
?>

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