Single Quotes: This is a string with a $variable inside.
Double Quotes: This is a string with a inside.
In PHP, single and double quotes behave differently when used to define strings.
When using single quotes, PHP treats the string literally, meaning it does not interpret variables or special characters within the string. For example, in 'This is a string with a $variable inside.', $variable will be treated as a literal string and not as a variable.
However, when using double quotes, PHP interprets variables and special characters within the string. For example, in "This is a string with a $variable inside.", $variable will be replaced with its value.
Using single quotes can be more efficient for simple strings without variables or special characters, while double quotes offer more flexibility when working with variables and special characters.