All PHP code must be enclosed inside <? and ?> closing tags
echo outputs text.
will display the value of $a which is 1
echo "Display this text $a=$a";
will display whatever is between the double quotes including the value of variables. Notice the used in the statement. The will escape the next character. Using a before special characters like " $ display the character. Using
echo 'Displays this text $a'; Displays everything inside single quotes. Variables are not interpreted. The example above displays as Displays this text $a.