for loops on PHP

for loops are the most complex loops in PHP. They behave like their C counterparts. The syntax of a for loop is:



for (expr1; expr2; expr3)
statement




The first expression (expr1) is evaluated (executed) once unconditionally at the beginning of the loop.

In the beginning of each iteration, expr2 is evaluated. If it evaluates to TRUE, the loop continues and the nested statement(s) are executed. If it evaluates to FALSE, the execution of the loop ends.

At the end of each iteration, expr3 is evaluated (executed).

Each of the expressions can be empty or contain…