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How do I get the name of a variable as a string in PHP?

Method 1: Using $GLOBALS:is used to reference all variables available in the global scope. This is an associative array that contains a reference to all variables that are currently defined in the global scope.Example:This example uses the reference $GLOBAL to get the variable name as a string.  
// Declare and initialize the variable $test = "This is a string" ;  
// Function that returns the variable name function getVariavleName ( $var ) { foreach ( $GLOBALS as $varName = > $value ) { if ( $value === $var ) { return $varName ; } } return ; }  
// function call and display
// variable name print getVariavleName ( $test );  
?>
Exit:
test
Method 2: Using the $$operator:$$var_name is known as a reference variable, where $var_name is a normal variable. $$var_name is used to refer to a variable named as the value of the $var_name variable. 
Example. Inthis example uses the $$operator to get the variable name as a string.  
// Declare and initialize the variable $name = "test" ;  
// Reference variable to store the string $ $name = " This is a string " ;  
// Show result print ( $name ) ;  
?>
Exit:
test

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