What are the potential pitfalls of not using proper quotation marks for constants or variables in PHP code?

Not using proper quotation marks for constants or variables in PHP code can lead to syntax errors or unexpected behavior. To avoid this, always ensure that constants are defined with proper quotation marks and variables are enclosed in curly braces when used within double quotes. 

// Incorrect usage without proper quotation marks
define(CONSTANT, "Hello World");
$variable = "name";

echo CONSTANT; // This will result in a syntax error
echo "My $variable is John"; // This will output "My  is John"
```

```php
// Corrected code with proper quotation marks
define('CONSTANT', "Hello World");
$variable = "name";

echo CONSTANT; // This will output "Hello World"
echo "My {$variable} is John"; // This will output "My name is John"

Keywords

PHP quotation marks constants variables syntax error

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