On this page I will show an example of using "" and '' in PHP. A double quote allows us to use variables as defined. A single quote will print the specific characters
within the text, not the variable.
To use double quotes I need to use the escape slash like "this" to tell my code
that I want it to identify those quotes as part of the text, not part of the code.
If I didn't do that it would believe that the echo command ended at the word 'this'
in the string.
When using a single quote in your string, you 'must' do the same.