for( … declaration …; … condition …; …action… ) {
	… execute code …
}

The arguments between brackets are 3: a declaration, a condition and an action. The declaration is usually an integer variable containing a start value, which is usually increased in the action. For example, we could make a for loop which is repeated 10 times:

for($i=1;$i<=10;$i++) {
	echo “<p>”.$i.”</p>”;
}

This will result in displaying the numbers 1 through 10.

If loop
The If loop is used to execute a certain code only when a certain condition is true.

While loop
The While loop is used to execute a certain code only when a condition is true, and repeat the code as long as the condition is still true.

Do While loop
The Do While loop is used to execute a certain code and repeat it as long as a condition is true. The difference with the while loop is that it executes the code at least once, then checks the condition for further repeating.

For loop
The For loop is used to repeat executing a code a certain amount of times. It does not only consist of a condition, but also a declaration of a variable and an action to perform. For example an integer would be declared and the action would be to increase the integer by 1 each time the loop’s code has been executed. Then a condition could be to execute the code as long as this variable is not greater than 10, to execute the code 10 times.

Foreach loop
This is a somewhat different kind of loop. It may be used to handle each sub-variable of an array apart, seperating the key and belonging value. This makes it easy to loop through all sub-variables ( all combinations of a key and a value ) of an array.

Each of these loops are explained inside apart references. Click on the title of the loop to get a reference of that specific loop.