PHP Tutorial > WHILE Loop
WHILE is used in PHP to provide a control condition. The basic syntax of WHILE is as follows:
WHILE (expression)
{
[code to execute]
}
WHILE tells PHP to execute the [code to execute] as long as the (expression) is true.
Let's look at an example. Assuming we have the following piece of code:
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$counter = 8;
WHILE ($counter < 10)
{
print "counter is now " . $counter . "<br>";
$counter++;
}
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The output of the above code is:
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counter is now 8
counter is now 9
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During the first iteration, $counter = 8, which means the expression, ($counter < 10), is true. Therefore, the print statement is executed, and $counter gets incremented by 1 and becomes 9.
During the second iteration, $counter = 9, which means the expression, ($counter < 10), is true. Therefore, the print statement is executed, and $counter gets incremented by 1 and becomes 10.
During the third iteration, $counter = 10, which means the expression, ($counter < 10), is false. Therefore, the WHILE condition no longer is true, and the code in the bracket is no longer executed.
Next: PHP FOR Loop
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