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;

Keywords

PHP 4 PHP 7 differences beginners awareness

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