Advanced PHP for Web Professionals

For Loops

For loops are useful constructions to loop through a finite set of data, such as data in an array:

for($i = 0; $i < sizeof($array); $i++) { 
    //do something with array[$i];
}

For loops require three things when they are defined:

• Counter— In the above example, $i = 0. You can pass in an already assigned variable or assign a value to the variable in the for statement.

• The condition required to continue the for loop— In the above example, while $i is less than the size of the $array, the for loop continues to be executed.

• Statement to modify the counter on each pass of the loop— In the above example, $i++ increments the counter after each loop.