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Difference between single quote and double quote string in php

Hi all

I am very new to PHP and I wanted to know what is the difference in use of ‘ ‘ and ” ” ?

Thanks

Answer 1

Double quotes evaluate the content of the string, the single quotes don’t.

$var = 123;
echo 'This is the value of my var: $var'; // output: This is the value of my var: $var
echo "This is the value of my var: $var"; // output: This is the value of my var: 123

It WAS a perfomance issue too, ’cause evaluation time affects the interpreter, but nowadays with the current (minimum) hardware it’s not an issue anymore.