“I pleaded to the court that this black chapter be closed and Mr Zardari be respectfully acquitted. The court accepted my plea,” he said.
He said there were no more cases outstanding against Zardari.
In recent weeks courts have cleared Zardari of several criminal cases including one of conspiracy to kill his estranged brother-in-law, Murtaza Bhutto, whom police shot dead in 1996.
Several corruption cases against Zardari, both in Pakistani courts and abroad, have also been quashed under an ordinance introduced by Pervez Musharraf, the country’s president, late last year.
It also granted an amnesty to Bhutto, Zardari and several other politicians.
Zardari, who served as a cabinet minister in his wife’s cabinet in the 1990s, spent a total of 11 years in jail but was never convicted.
Sharif, who was a bitter enemy of both Bhutto and Zardari in the 1990s, formed a coalition government with the PPP after the February elections.
However, he pulled his Pakistan Muslim League ministers out of the cabinet on May 13 after failing to resolve a disagreement with Zardari over the restoration of judges sacked by Musharraf last year.