What are the differences between PHP 4 and PHP 7 that beginners should be aware of?
PHP 4 and PHP 7 have many differences in terms of features, performance, and security. Beginners should be aware that PHP 4 is no longer supported and lacks many modern features and improvements found in PHP 7. It is recommended to upgrade to PHP 7 for better performance, improved security, and access to new language features.
// PHP 4 code
$variable = "Hello World";
echo $variable;
// PHP 7 code
$variable = "Hello World";
echo $variable;
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