Are there any specific PHP functions that should be used instead of the ones currently in the code?

The issue with the current code is that it is using deprecated PHP functions that may be removed in future versions of PHP. To future-proof the code, it is recommended to replace these deprecated functions with their newer counterparts. 

// Replace deprecated PHP functions with their newer counterparts

// Deprecated function: mysql_connect()
// New function: mysqli_connect()
$mysqli = mysqli_connect('localhost', 'username', 'password', 'database');

// Deprecated function: mysql_query()
// New function: mysqli_query()
$result = mysqli_query($mysqli, "SELECT * FROM table");

// Deprecated function: mysql_fetch_assoc()
// New function: mysqli_fetch_assoc()
while ($row = mysqli_fetch_assoc($result)) {
    // Do something with the row
}

// Deprecated function: mysql_real_escape_string()
// New function: mysqli_real_escape_string()
$escaped_string = mysqli_real_escape_string($mysqli, $unescaped_string);

Keywords

PHP functions code optimization performance improvement function replacement code refactoring

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