What are common reasons for PHP variables not being replaced within a string despite using proper syntax and functions?

The most common reasons for PHP variables not being replaced within a string despite using proper syntax and functions include using single quotes instead of double quotes, not properly concatenating variables within the string, or using incorrect variable names. To solve this issue, ensure that you are using double quotes for the string, properly concatenating variables with a dot (.), and using the correct variable names. 

// Incorrect way - variables not replaced within the string
$name = "Alice";
$message = 'Hello, $name!'; // Using single quotes

// Correct way - variables replaced within the string
$name = "Alice";
$message = "Hello, $name!"; // Using double quotes

echo $message;

Keywords

PHP variables string interpolation syntax functions

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