You can call a user-defined function in PHP using a string variable by using the variable as the function name like ______.

  • $function_name() or ${$function_name}()
  • $function_name;() or {$function_name;}()
  • $function_name[] or {$function_name}[]
  • $function_name{} or ${$function_name}{}
In PHP, you can call a user-defined function using a string variable by using the variable as the function name followed by parentheses () or curly brackets {}. For example, if $function_name is a string variable containing the function name, you can call the function like $function_name(). The other mentioned options are not valid syntax for calling a function using a string variable in PHP. For further details, refer to the PHP documentation on variable functions: http://php.net/manual/en/functions.variable-functions.php
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