How can debugging techniques, such as outputting query results and checking variable values, be used to troubleshoot issues with PHP code?

To troubleshoot issues with PHP code, debugging techniques such as outputting query results and checking variable values can be used to identify errors in the code. By printing out the results of queries or displaying the values of variables at different points in the code, developers can pinpoint where the issue is occurring and make necessary corrections. 

// Example of outputting query results and checking variable values for debugging

// Perform a query
$query = "SELECT * FROM users";
$result = mysqli_query($connection, $query);

// Output query results
while($row = mysqli_fetch_assoc($result)) {
    echo "User ID: " . $row['id'] . " | Username: " . $row['username'] . "<br>";
}

// Check variable values
$variable = 10;
echo "Variable value: " . $variable;

Keywords

debugging techniques outputting query results checking variable values PHP code troubleshoot

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