PHP 4.4.2
Initialize 1 million objects: 1167.68 ms
Initialize 1 million arrays: 734.86ms
Fetch object: 2.35ms
Fetch array: 0.74ms
Make object with 1,000 properties: 2.96ms
Make array with 1,000 keys: 2.54ms
Foreach through 1,000 object properties: 3.74ms
Foreach through 1,000 array keys: 2.4ms
Send 1,000 objects with 500 properties to a function by value: 1400.54ms
Send 1,000 arrays with 500 keys to a function by value: 1033.07ms
Send 1,000 objects with 25 properties to a function by value: 78.26ms
Send 1,000 arrays with 25 keys to a function by value: 51.39ms
Send 1,000 objects with 500 properties to a function by reference: 1392.78ms
Send 1,000 arrays with 500 keys to a function by reference: 1067.2ms
Send 1,000 objects with 25 properties to a function by reference: 79.5ms
Send 1,000 arrays with 25 keys to a function by reference: 50.37ms
PHP 5.1.2
Initialize 1 million objects: 752.37 ms
Initialize 1 million arrays: 286.85ms
Fetch object: 0.89ms
Fetch array: 0.52ms
Make object with 1,000 properties: 1.19ms
Make array with 1,000 keys: 1.38ms
Foreach through 1,000 object properties: 0.96ms
Foreach through 1,000 array keys: 1.2ms
Send 1,000 objects with 500 properties to a function by value: 734.31ms
Send 1,000 arrays with 500 keys to a function by value: 475.04ms
Send 1,000 objects with 25 properties to a function by value: 40.94ms
Send 1,000 arrays with 25 keys to a function by value: 22.07ms
Send 1,000 objects with 500 properties to a function by reference: 698.29ms
Send 1,000 arrays with 500 keys to a function by reference: 472.9ms
Send 1,000 objects with 25 properties to a function by reference: 36.54ms
Send 1,000 arrays with 25 keys to a function by reference: 25.43ms