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What is the difference between using single quotes and double quotes in PHP when outputting variables within strings?

When outputting variables within strings in PHP, using double quotes allows for variable interpolation, meaning the variable's value will be displayed. Single quotes will treat the variable name as a literal string, not displaying its value. To ensure variables are properly displayed within strings, use double quotes.

php 
$name = "John";
// Using double quotes for variable interpolation
echo "Hello, $name!";
// Output: Hello, John!

// Using single quotes will not display the variable value
echo 'Hello, $name!';
// Output: Hello, $name!

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