How can debugging techniques like echoing SQL codes help identify and resolve PHP script issues effectively?

To identify and resolve PHP script issues effectively, debugging techniques like echoing SQL codes can help by providing visibility into the actual SQL queries being executed by the script. This can help pinpoint any syntax errors or logical issues in the SQL statements that may be causing problems in the script. By echoing out the SQL codes, developers can easily identify where the issue lies and make necessary corrections to resolve the problem.

// Example of echoing SQL code for debugging purposes
$sql = "SELECT * FROM users WHERE id = 1";
echo $sql; // Output: SELECT * FROM users WHERE id = 1

// Code snippet to implement echoing SQL codes for debugging
$query = "SELECT * FROM users WHERE id = 1";
echo $query;