How can syntax errors in PHP code be identified and resolved, especially when using double quotes?

Syntax errors in PHP code, especially when using double quotes, can be identified by carefully reviewing the code for missing or mismatched quotes, parentheses, or semicolons. To resolve the issue, make sure that all opening quotes have corresponding closing quotes, and all parentheses are properly matched. Additionally, pay attention to the placement of semicolons at the end of statements.

// Example of PHP code with syntax error using double quotes
$name = "John;
echo "Hello, $name!";
```

To fix the syntax error in the code snippet above, the missing closing quote after "John" and the missing semicolon at the end of the `$name` assignment statement should be added:

```php
// Corrected PHP code with double quotes
$name = "John";
echo "Hello, $name!";