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.
Syntax
while (condition)
code to be executed; Example
The following example demonstrates a loop that will continue to run as long as the variable i is less than, or equal to 5. i will increase by 1 each time the loop runs:
<html>
<body>
<?php
$i=1;
while($i<=5)
{
echo "The number is " . $i . "
";
$i++;
}
?>
</body>
</html>
The do...while Statement
The do...while statement will execute a block of code at least once - it then will repeat the loop as long as a condition is true.
Syntax
do
{
code to be executed;
}
while (condition); Example
The following example will increment the value of i at least once, and it will continue incrementing the variable i as long as it has a value of less than 5:
<html>
<body>
<?php
$i=0;
do
{
$i++;
echo "The number is " . $i . "
";
}
while ($i<5);
?>
</body>
</html>
The for Statement
The for statement is used when you know how many times you want to execute a statement or a list of statements.
Syntax
for (initialization; condition; increment)
{
code to be executed;
} Note: The for statement has three parameters. The first parameter initializes variables, the second parameter holds the condition, and the third parameter contains the increments required to implement the loop. If more than one variable is included in the initialization or the increment parameter, they should be separated by commas. The condition must evaluate to true or false.
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