Double quoted
In PHP, double-quoted strings allow for the interpolation of variables and special characters such as escape sequences (\n, \t, etc.) within the string. This means that variables and special characters within double-quoted strings will be replaced with their respective values when the string is evaluated. Double-quoted strings are denoted by enclosing the string in double quotes, e.g. “Hello $name!”. In contrast, single-quoted strings are literal and do not allow for variable interpolation or most escape sequences.
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