March 22nd, 2019 
Nilesh Chaurasia PHP echo Function
echo function is used to print some text output in the plain HTML markup. In the PHP block, echo function is the simplest way to print any text output.
echo function can be used to print text or variables in the PHP script.
Warning: In the PHP block, if you create a variable, the value of that variable is not displayed in the HTML output file.
Note: In the PHP block, if you perform an arithmetic operation the result of that operation must be printed with the help of the echo function.
PHP echo Function Example with String to Print
The most common use of echo function is to print some static string in the processed HTML output file.
Example: This PHP file have one PHP block. And it is showing how to use echo function code syntax.
<!DOCTYPE html> <html> <body> <p>This example shows one echo function to print string.</p> <?php echo "String Output from PHP Block."; ?> <p>This PHP block prints static string in the processed HTML output.</p> </body> </html>
In the code above we have used one PHP blocks, having single echo function call. Now you can see the processed HTML file received by the browser.
echo Function Example with Printing Variable Values
In the PHP web server scripting language you can create a variable and you can perform arithmetic and logical operations on them.
To print the value of variable in the processed HTML output file, we mostly use the echo function.
Caution The PHP process engine actually evaluate the PHP block code. And the final processed file contain only HTML code, all the PHP block is replaced by its HTML output only.
Example: This PHP file have two PHP block. And it is showing, how you can use variables with echo function.
<!DOCTYPE html> <html> <body> <p>This example shows PHP block with variables.</p> <?php $x=23; $y=45; $z=$x + $y; echo $z; ?> <p>This PHP block prints addition of two number in the processed HTML output.</p> <?php echo "The addition of two numbers is " . $z; ?> </body> </html>
In the code above we have used two PHP blocks. In the screenshot below shows the browser output.
In the second PHP blocks we have used dot(.) operator, which is known as concatenation operator. The concatenation operator is used to join string in the PHP.
Fig 1 clearly shows how you can print the value of variables in the HTML output with the help of echo function.
Note The PHP code is evaluated at the server side only, the client computer browser can run HTML code only.
echo Function Example with Printing HTML tags also
The echo string output is without any HTML markup by default, but you can print any HTML markup easily with echo function just like a simple string.
Example: This file have two echo function calls. The string output in the first echo is without HTML markup and second echo function with h2 heading markup.
<!DOCTYPE html> <html> <body> <p>This example shows echo function and HTML tags.</p> <?php echo "This string is shown in normal default body text style"; echo "<h2>This string is shown in h2 text style</h2>"; ?> </body> </html>
If you are not including any HTML tag or markup than the string is shown in normal text style.
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