How important is it to check the line above the reported error line when troubleshooting PHP code?

When troubleshooting PHP code, it is important to check the line above the reported error line because the error may be caused by a syntax issue or variable assignment that occurred in the line above. By examining the line above, you can often identify the root cause of the error and make the necessary corrections to resolve it.

// Example of checking the line above the reported error line
$variable = 10;
echo $variable; // This line is fine
echo $variable2; // Error will be reported here, but the issue is with the variable assignment on the line above