What are common warning messages when transitioning from PHP 5 to PHP 7?

When transitioning from PHP 5 to PHP 7, common warning messages may include deprecated functions, changes in error handling, and stricter type declarations. To solve these issues, you will need to update your code to use the latest PHP syntax and functions, ensure error handling is done correctly, and make sure that all variable types are declared properly. 

// Deprecated function warning in PHP 7
// Update the deprecated function with the new equivalent

// Deprecated function in PHP 5
mysql_connect('localhost', 'username', 'password');

// Updated function in PHP 7
mysqli_connect('localhost', 'username', 'password');

Keywords

PHP 5 PHP 7 warning messages backward incompatible changes deprecated functions

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