For

The for loop in PHP allows you to execute a block of code repeatedly for a given number of iterations.

Here is the general syntax for a for loop in PHP:

for (initialization; condition; increment) {
   code to be executed;
}

The initialization expression is executed before the loop starts, and it is usually used to initialize a loop counter. The condition expression is evaluated at the beginning of each iteration, and the loop continues to run as long as the condition is true. The increment expression is executed at the end of each iteration, and it is usually used to update the loop counter.

Here is an example of a for loop that counts from 1 to 10:

for ($i = 1; $i <= 10; $i++) {
   echo "$i ";
}

In this example, the value of $i is initialized to 1 before the loop starts. The loop will continue to run as long as $i is less than or equal to 10. At the end of each iteration, $i is incremented by 1. The code inside the loop will print the value of $i on each iteration.

You can also nest for loops to create a loop within a loop. Here is an example of a nested for loop that counts from 1 to 3 in the outer loop, and from 4 to 6 in the inner loop:

for ($i = 1; $i <= 3; $i++) {
   for ($j = 4; $j <= 6; $j++) {
       echo "$i, $j ";
   }
}

In this example, the inner loop will execute 3 times for each iteration of the outer loop, resulting in a total of 9 iterations. The code inside the inner loop will print the values of $i and $j on each iteration.