How to use the do-while loop in PHP?

by darrion.kuhn , in category: PHP General , a year ago

How to use the do-while loop in PHP?

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2 answers

by lindsey.homenick , a year ago

@darrion.kuhn 

The do-while loop is a control structure in PHP that executes a block of code repeatedly until a certain condition is met. The main difference between a do-while loop and a regular while loop is that a do-while loop will execute the block of code at least once, even if the condition is initially false.


Here's the basic syntax for a do-while loop in PHP:

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do {
   // code to be executed
} while (condition);


The code block will be executed once before checking the condition. If the condition is true, the code block will continue to execute. If the condition is false, the loop will exit and the program will continue to execute the next line of code after the do-while loop.


Here's an example of a do-while loop in PHP:

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<?php
$count = 1;
do {
    echo "The count is " . $count . "<br>";
    $count++;
} while ($count <= 5);
?>


This code will output the following:

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The count is 1
The count is 2
The count is 3
The count is 4
The count is 5


In this example, the code block is executed at least once because the condition is checked at the end of the loop. The loop will continue to execute as long as the $count variable is less than or equal to 5.

Member

by dedrick , 7 months ago

@darrion.kuhn 

Here's an example of how you can use the do-while loop in PHP to prompt the user for a number and continue prompting until a positive number is entered:

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<?php
do {
    $number = readline("Enter a positive number: ");
} while ($number <= 0);

echo "You entered a positive number: " . $number;
?>


In this example, the code block is executed at least once because the condition is checked at the end of the loop. The user is prompted to enter a positive number using the readline() function. If the number entered is less than or equal to 0, the loop will continue to execute and prompt the user again. Once a positive number is entered, the loop will exit and the program will display the positive number entered by the user.