Is it necessary to consider read and execute permissions when setting numerical values for server permissions in PHP?

When setting numerical values for server permissions in PHP, it is necessary to consider both read and execute permissions. Read permission allows the file to be opened and read, while execute permission allows the file to be executed as a program. Without these permissions set correctly, the server may not be able to access or execute the file properly.

// Set read and execute permissions for a file
chmod("example.php", 0555);