How do I interpolate strings in PHP?

In PHP, you can interpolate a string, substituting an object into a string. To substitute the value of a variable, you need to enclose it in double-quotes in the string. Interpolation only works with double-quoted strings. If single quotes are used in the string, then the variable's value is not interpolated, and the string will be printed as-is. In this PHP interpolation string example, we use interpolation to format a string using several variables. Click Execute to run the PHP String Interpolation Example online and see the result.
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