Looping in PHP

There are 2 standard types of while loops.

Type 1: while loop

eg.

<?php

$x = 0;
while ($x < 10) {
// do something
$x++;
}

?>

The conditional test is evaluated BEFORE the code block is executed.

Type 2: do ... while loop

eg.

<?php

$x = 0;
do {
// do something
$x++;
} while ($x < 10);

?>

The conditional test is evaluated AFTER the code block is executed.
This means that the code block is run a minimum of 1 time.

break and continue statements can affect looping if added in the code block.

break; abandons the while loop, and continues to the next statement.
continue; skips the current loop, but continues with the next loop.

eg.

<?php

$x = 0;
while ($x < 10) {
if ($x == 5) {
$x++;
continue;
}
if ($x == 8) {
break;
}
print($x . "<br>");
$x++;
}

?>

prints:

0
1
2
3
4
6
7

5 is missing as that iteration is skipped by continue;
8,9 are missing as break; terminated the loop when $x equals 8.

for loop statement:

eg.

<?php

for ($x=0; $x<10; $x++) {
if ($x == 5) {
continue;
}
if ($x == 8) {
break;
}
print($x . "<br>");

}

?>

prints the same results as above.