How can PHP developers efficiently troubleshoot and debug issues related to variable concatenation?

When troubleshooting variable concatenation issues in PHP, developers can efficiently debug by using the `var_dump()` function to inspect the variables involved in the concatenation. This allows developers to see the data types and values of the variables, helping identify any inconsistencies that may be causing the issue. Additionally, checking for syntax errors or incorrect variable names can also help resolve concatenation problems.

// Example code snippet for troubleshooting variable concatenation in PHP
$var1 = "Hello";
$var2 = "World";

// Debugging with var_dump()
var_dump($var1 . $var2);