What are the differences between using single quotes and double quotes in PHP scripts for setting form actions?

When setting form actions in PHP scripts, using single quotes or double quotes can affect how variables and escape sequences are interpreted. Double quotes allow for variable interpolation and escape sequences to be evaluated, while single quotes treat everything as a literal string. To ensure proper evaluation of variables and escape sequences in form actions, it is recommended to use double quotes. 

// Using double quotes for form action with variable interpolation
$action = "process.php";
echo "<form action=\"$action\" method=\"post\">";

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single quotes double quotes PHP scripts form actions differences

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