max-option-length-example.php

<?php

/**
 * This works
 */
add_option( 'verykey', 'wow' ); // Stored with key 'verykey'

echo get_option( 'verykey', '' ); // Outputs 'wow'

/**
 * This doesn't work (as expected)
 */
add_option( 'averylargekeythatmakesnosensebutsometimesyouendupwithverylargekeysbecauseyougeneratethem', 'wow' ); // Stored with key 'averylargekeythatmakesnosensebutsometimesyouendupwithverylargeke'

echo get_option( 'averylargekeythatmakesnosensebutsometimesyouendupwithverylargekeysbecauseyougeneratethem', '' ); // Outputs an empty string