How can PHP developers ensure that variables are properly initialized and populated before being used in scripts to avoid undefined variable errors?

To ensure that variables are properly initialized and populated before being used in scripts to avoid undefined variable errors, PHP developers can use isset() or empty() functions to check if a variable has been set or is empty before using it in the script. 

if(isset($variable)){
    // Variable is set and not null, proceed with using it
    // Your code here
} else {
    // Variable is not set or is null, handle the error or initialize the variable
    $variable = "default value";
}

Keywords

PHP variables initialization error handling debugging

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