The echo function can be used to output strings in PHP. If a variable is passed to this function, it outputs this variable. If a string is passed to it instead, echo displays it as long as it is enclosed in single or double-quotes. The following example shows a script that is nothing more than “Hello World!”. Both single and double quotation marks are used once.
<?php echo("Hello World!"); echo('Hello World!'); ?>
Hello World!Hello World!
A line break is not visible because none was passed to the echo function. The following code is the same as the above code, but this time with a line break:
<?php echo("Hello World!\n"); echo('Hello World!'); ?>
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