The echo and print statements are both used to output data in PHP.

The echo statement can be used to output multiple strings separated by commas. It does not return any value and is generally used for outputting content quickly. Here is an example:

echo "Hello, World!", " This is a PHP program.";

The print statement can also be used to output a string. However, it returns a value of 1, which can be useful in certain situations. It is generally used for outputting content that needs to be stored in a variable or used in a more complex expression. Here is an example:

$output = print "Hello, World!";

Both echo and print can be used to output variables, as well as HTML tags and special characters. It is generally recommended to use echo over print for better performance, as it is slightly faster.