How can PHP developers ensure that a string variable contains the text "$id" instead of the value of the variable $id?

When assigning a string that contains "$id" to a variable in PHP, developers can use single quotes instead of double quotes to ensure that the text "$id" is preserved as is, rather than being interpreted as the value of the variable $id. Single quotes prevent variable interpolation, so the text inside them will be treated literally. 

$id = 123;
$string = '$id'; // This will store the text "$id" in the $string variable
echo $string; // Output: $id

Keywords

PHP string variable text value escape characters

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