Please explain me the output of this code.

Question

This code gives strange output. The only difference between the last two lines is in using quotes. Why is it so?

https://code.sololearn.com/wy5K43olzruM/?ref=app

Answer 1

The multi quotes looks on variables and normal characters, the single quotes are for char to char output.

Answer 2

The text in echo statement should be in single or double quotation marks.

Answer 3

php echo consider $ as variable initiator inside double quotes and consider $ as contant literal/a constant letter inside single qoutes.