Slide 5.11: PHP looping

PHP Looping

Looping statements in PHP are used to execute the same block of code a specified number of times. PHP has the following looping statements:

while—loops through a block of code if and as long as a specified condition is true.
do...while—loops through a block of code once, and then repeats the loop as long as a special condition is true.
for—loops through a block of code a specified number of times.
foreach—loops through a block of code for each element in an array.

The while Statement

The while statement will execute a block of code if and as long as a condition is true.

while ( condition )
  code to be executed;

The example prints the random number between 0 and 9 until the random number matches the input value:

Compare the web input to character digits instead of integer digits.

TRUE and FALSE are a boolean type of PHP.

The rand(min,max) function returns a random number between min and max, inclusively.

break ends execution of the current for, foreach, while, do-while or switch structure.

 <html><body>
 <?php
  $input = ;
  if ( ( $input < '' ) ||
       ( $input > '' ) )
   echo "$input is not a digit!";
  else {
   while ( true ) {
    $rand = rand( 0, 9 );
    if ( $input == $rand ) {
     echo "Found the random #: $rand.";
     break;
    }
    else
     echo "The random # is $rand.";
   }
  }
 ?>
 </body></html>