PHP, Arrays & Passing by Reference
Do you know that objects in PHP5 are passed by reference, while arrays and other scalar variables are passed by value? Yes, you know it, but it’s not exactly true. Let’s see some example and let’s try to answer few questions.
// depending on the machine but both lines return // expectedly equal values: 331208 // 331208 echo memory_get_usage(); echo memory_get_usage();
These two lines of code, expectedly return the same value (in my case 331208), which shows us that because nothing happened in between them the memory usage isn’t growing. Let’s now put some code in between them.
echo memory_get_usage(); // 331616 $a = 10; echo memory_get_usage(); // 331696