PHP Tutorial Tutorials - PHP echo

We had use the PHP echo statement to output text to the web browser in the previous lesson.

PHP echo Statement

PHP echo is actually a language construct not a function.so you don't need to use parenthesis with it.

<?php
echo "Hello World";

// multiple arguments
echo 'multiple ', 'parameters', PHP_EOL;

// concatenation string
echo 'concatenation  ' . 'string '.PHP_EOL;

$some_var = true;
echo $some_var ? 'true': 'false'; // changing the statement around
?>

if you want to use more than one parameters, the parameters must not be enclosed within parentheses.

<?php
// multiple arguments
echo 'multiple ', 'parameters';

// Invalid
echo ('multiple ', 'parameters');
// Parse error: syntax error, unexpected ','
?>

PHP echo: Display strings of Text

the echo statement can display anything that can be displayed to the browser,such as string,multi line strings, escaping characters, variable, array etc.

<?php  
echo "Hello World";  
?>  

Output:

Hello World

PHP echo: Display multi line strings

<?php
echo 'You can also have embedded newlines in
strings this way as it is
okay to do';
?>

Output:

You can also have embedded newlines in
strings this way as it is
okay to do

PHP echo: Display HTML Code

<?php
echo '<h2 class="tool-title">PHP</h2>';
echo '<div class="tool-desc">PHP:Hypertext Preprocessor is a popular scripting language that is especially suited to web development.</div>';
?>

PHP echo: Display Variables

<?php
// Defining variables
$str = "Hello World!";
$int = 798;
$arr = array(1,2,3);
 
// Displaying variables
echo $str;
echo "<br>";
echo $int;
echo "<br>";
foreach($arr as $value){
    echo $value." ";
}
?>

Output:

Hello World!
798
1 2 3

PHP echo: Display strings and Variables

You can also place variables inside of double-quoted strings.
The PHP parsing engine will grab the string value of that variables and replace it in the string.

Note: use double-quotes. single-quotes won't work.

<?php

$site = "Lautturi";

echo "Hello $site".PHP_EOL;
// This won't work
echo 'Hello $site'.PHP_EOL;
?>

Output:

Hello Lautturi
Hello $site

Careful when echoing quotes!

If you want to output a string that includes quotations, either use an apostrophe ( ' ) or escape your quotes. i.e. "

<?php
// This won't work because of the string includes quotations
echo "<h2 class="tool-title">Lautturi PHP tutorial</h2>";

// Works, because we escaped the quotes!
echo "<h2 class=\"tool-title\">Lautturi PHP tutorial</h2>";

// Works, because we used an apostrophe '
echo "<h2 class='tool-title'>Lautturi PHP tutorial</h2>";

// Works, because we used an apostrophe '
echo '<h2 class="tool-title">Lautturi PHP tutorial</h2>';
?>