What is the significance of the error "Undefined variable: row" in PHP code?

The error "Undefined variable: row" in PHP code signifies that the variable "row" is being used without being defined or initialized in the code. To solve this issue, you need to make sure that the variable "row" is defined before using it in the code by assigning it a value or declaring it. 

$row = ''; // Initialize the variable "row" before using it

// Code snippet with the variable "row" being used
echo $row;

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PHP error Undefined variable row significance

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