While loop in PHP Syntax and Example

While loop in PHP is also used for repeating statements in PHP.

PHP while loop checks for the condition if the condition is true then code inside the body of the loop is get executed.

while – As long conditions are true, it loops back again and again through the block of code.

Syntax

`while (condition) { code to be executed; }`

The condition is a Boolean expression that is evaluated at the beginning of each iteration of the loop.

If the condition is true, the block of code inside the loop is executed.

After the block of code is executed, the condition is evaluated again,

and if it is still true, the loop continues to iterate. If the condition is false, the loop terminates and execution continues with the next statement after the loop.

While loop in PHP Example

Example of while loop

<?php
$num = 1;
while ($num <= 10) {
    echo $num . "<br>";
    $num++;
}
?>

<?php

$num = 1;

while ($num <= 10) {

echo $num . "<br>";

$num++;

}

In this example, the loop will repeatedly execute the block of code inside the loop (which prints the value of $num and increments it by 1 as long as $num is less than or equal to 10. The output of this code will be the numbers 1 through 10 printed on separate lines.

Example: Write a program to repeat the statements in PHP.

<?php
$a = 11;
while($a <= 3) {
   echo "The number is: $a <br/>";
   $a++;
} 
?>

<?php

$a = 11;

while($a <= 3) {

echo "The number is: $a <br/>";

$a++;

}

The increment and decrement while loop count variable can be used only inside loop.

For here $a++ is used to increment the value of $a.

the programmer has to take care of this otherwise while loop will be infinite.

Result:

The number is: 11
The number is: 12
The number is: 13

<?php

// Set the table size
$size = 10;

// Initialize the counters
$i = 1;
$j = 1;

// Generate the table using a while loop
echo "<table border='1'>";
while ($i <= $size) {
    echo "<tr>";
    while ($j <= $size) {
        echo "<td>" . ($i * $j) . "</td>";
        $j++;
    }
    echo "</tr>";
    // Reset the inner loop counter
    $j = 1;
    // Increment the outer loop counter
    $i++;
}
echo "</table>";

?>

<?php

// Set the table size

$size = 10;

// Initialize the counters

$i = 1;

$j = 1;

// Generate the table using a while loop

echo "<table border='1'>";

while ($i <= $size) {

echo "<tr>";

while ($j <= $size) {

echo "<td>" . ($i * $j) . "</td>";

$j++;

}

echo "</tr>";

// Reset the inner loop counter

$j = 1;

// Increment the outer loop counter

$i++;

}

echo "</table>";

In this example, we first set the size of the multiplication table to 10. Then, we initialize two counters, $i and $j, to keep track of the current row and column of the table.

We then use a while loop to generate the table. The outer loop runs as long as $i is less than or equal to the table size.

Within the outer loop, we output a table row (<tr>) and start an inner loop. The inner loop runs as long as $j is less than or equal to the table size.

Within the inner loop, we output a table cell (<td>) that contains the product of $i and $j. We then increment $j to move to the next column.

After the inner loop completes, we close the table row (</tr>) and reset the inner loop counter $j back to 1. Finally, we increment the outer loop counter $i to move to the next row.

Write a PHP program to reverse the digits of numbers

<!DOCTYPE html>
<html>
<body>

<?php
// Function to reverse the digits of a number
function reverseDigits($number) {
    $reversedNumber = 0;
    
    while ($number > 0) {
        $digit = $number % 10;
        $reversedNumber = $reversedNumber * 10 + $digit;
        $number = (int)($number / 10);
    }
    
    return $reversedNumber;
}

// Input number
$originalNumber = 123456789;

// Call the function to reverse the digits
$reversedNumber = reverseDigits($originalNumber);

// Output the reversed number
echo "Original Number: $originalNumber<br>";
echo "Reversed Number: $reversedNumber";
?>


</body>
</html>

<!DOCTYPE html>

<html>

<body>

<?php

// Function to reverse the digits of a number

function reverseDigits($number) {

$reversedNumber = 0;

while ($number > 0) {

$digit = $number % 10;

$reversedNumber = $reversedNumber * 10 + $digit;

$number = (int)($number / 10);

}

return $reversedNumber;

}

// Input number

$originalNumber = 123456789;

// Call the function to reverse the digits

$reversedNumber = reverseDigits($originalNumber);

// Output the reversed number

echo "Original Number: $originalNumber<br>";

echo "Reversed Number: $reversedNumber";

</body>

</html>

Original Number: 123456789
Reversed Number: 987654321

1 2	Original Number: 123456789 Reversed Number: 987654321

<?php
// Set the number of rows for the pattern
$numRows = 5;

// Initialize a variable for the row counter
$row = 1;

// Start the outer while loop to control the rows
while ($row <= $numRows) {
    // Initialize a variable for the column counter
    $col = 1;

    // Start the inner while loop to print numbers in each row
    while ($col <= $row) {
        echo $col;
        // Add a space after each number except the last one
        if ($col < $row) {
            echo " ";
        }
        $col++;
    }

    // Move to the next line for the next row
    echo "\n";
    $row++;
}
?>

<?php

// Set the number of rows for the pattern

$numRows = 5;

// Initialize a variable for the row counter

$row = 1;

// Start the outer while loop to control the rows

while ($row <= $numRows) {

// Initialize a variable for the column counter

$col = 1;

// Start the inner while loop to print numbers in each row

while ($col <= $row) {

echo $col;

// Add a space after each number except the last one

if ($col < $row) {

echo " ";

}

$col++;

}

// Move to the next line for the next row

echo "\n";

$row++;

}

1 2

1 2 3

1 2 3 4

1 2 3 4 5

PHP for and for each loop statement

PHP does while loop statement with syntax and example

Syntax

while (condition) { code to be executed;}

While loop in PHP Example

Example: Write a program to repeat the statements in PHP.

Write a PHP program to reverse the digits of numbers

Read More

`while (condition) { code to be executed; }`