PHP Loops

In PHP, loops are used to execute a block of code repeatedly based on a certain condition. There are three types of loops in PHP: for, while, and do...while loops.

Here are some examples of using loops in PHP:

1. for loop – Used to execute a block of code for a specified number of times

for ($i = 0; $i < 10; $i++) {
    echo $i . " ";
}

In this example, the for loop is used to print the numbers from 0 to 9 to the screen. The loop starts with the initialization statement $i = 0, continues as long as the condition $i < 10 is true, and increments the value of $i by 1 on each iteration. The echo statement is then used to print the value of $i to the screen.

2. while loop – Used to execute a block of code as long as a certain condition is true

$num = 0;
while ($num < 10) {
    echo $num . " ";
    $num++;
}

In this example, the while loop is used to print the numbers from 0 to 9 to the screen. The loop continues as long as the condition $num < 10 is true. The echo statement is used to print the value of $num to the screen, and the value of $num is incremented by 1 on each iteration using the statement $num++.

3. do…while loop – Used to execute a block of code at least once, and then as long as a certain condition is true

$num = 0;
do {
    echo $num . " ";
    $num++;
} while ($num < 10);

In this example, the do...while loop is used to print the numbers from 0 to 9 to the screen. The loop starts by executing the code block inside the do statement, which prints the value of $num to the screen and increments the value of $num by 1 using the statement $num++. The loop continues as long as the condition $num < 10 is true.

By using loops in PHP, you can execute a block of code repeatedly based on a certain condition, allowing you to perform complex operations efficiently and effectively.

3. break and continue statements – Used to control the execution of a loop

for ($i = 0; $i < 10; $i++) {
    if ($i == 5) {
        continue;
    }
    if ($i == 8) {
        break;
    }
    echo $i . " ";
}

In this example, the for loop is used to print the numbers from 0 to 7 to the screen, skipping the number 5 and ending the loop when the number 8 is reached. The continue statement is used to skip the iteration when the value of $i is equal to 5, while the break statement is used to exit the loop when the value of $i is equal to 8.

By using nested loops, foreach loops, and break and continue statements, you can create more complex and efficient programs in PHP that allow you to perform operations on data structures such as arrays and matrices, and control the execution of loops based on specific conditions.