How can PHP developers ensure that variables are properly defined and accessible in their code?

PHP developers can ensure that variables are properly defined and accessible in their code by declaring variables before using them, using appropriate variable scopes (global, local, static), and avoiding variable naming conflicts. Additionally, developers can use PHP functions like isset() or empty() to check if a variable is defined before using it to prevent errors. 

<?php
// Ensure variable is properly defined and accessible
$var = "Hello, World!";

if(isset($var)){
    echo $var;
} else {
    echo "Variable is not defined.";
}
?>

Keywords

variable scope global keyword local variables superglobals isset function

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