Core PHP Programming: Using PHP to Build Dynamic Web Sites

Repeating Code

The last type of functionality in this brief introduction is looping. Looping allows you to repeat the execution of code. Listing 1.7 is an example of a for loop. The for statement expects three parameters separated by semicolons. The first parameter is executed once before the loop begins. It usually initializes a variable. The second parameter makes a test. This is usually a test against the variable named in the first parameter. The third parameter is executed every time the end of the loop is reached.

The for loop in Listing 1.7 will execute three times. The initialization code sets the variable count to be one. Then the testing code compares the value of count to three. Since one is less than or equal to three, the code inside ...