PHP -  While Function Control

The while statement is a looping construct that repeatedly executes some code while a particular expression is true:

while(expr) {         while(expr):

 statements statements

}                     endwhile;

The while expression is checked before the start of each iteration. If the expression evaluates to true, the code within the loop is executed. If the expression evaluates to false, however, execution skips to the code immediately following the while loop. Note that you can omit the curly braces with the first form of the while statement if you only need to execute a single statement.

It is possible to break out of a running loop at any time using the break keyword. This stops the current loop and, if control is within a nested set of loops, the next outer loop continues. It is also possible to break out of many levels of nested loops by passing a numerical argument to the break statement (break n) that specifies the number of nested loops it should break out of. You can skip the rest of a given loop and go onto the next iteration by using the continue keyword. With continue n, you can skip the current iterations of the n innermost loops.

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