apc_cas Updates an old value with a new value &reftitle.description; boolapc_cas stringkey intold intnew apc_cas updates an already existing integer value if the old parameter matches the currently stored value with the value of the new parameter. &reftitle.parameters; key The key of the value being updated. old The old value (the value currently stored). new The new value to update to. &reftitle.returnvalues; &return.success; &reftitle.examples; ]]> &example.outputs.similar; &reftitle.seealso; apc_dec apc_store