Difference between an If statement and While loop

I read this Manual by PHP.com about While loops.

I don't understand the purpose of While loops in PHP.

It looks exactly like an if statement to me.

What is the difference between an if statement and a while loop?

How do while loops work, what do they do, and when should I use them?

For example, can't this:

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

be done like this?:

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

An if statement checks if an expression is true or false, and then runs the code inside the statement only if it is true. The code inside the loop is only run once...

if (x > y)
{
   // this will only happen once
}

A while statement is a loop. Basically, it continues to execute the code in the while statement for however long the expression is true.

while (x > y)
{
  // this will keep happening until the condition is false.
}

When to use a while loop:

While loops are best used when you don't know exactly how many times you may have to loop through a condition - if you know exactly how many times you want to test a condition (e.g. 10), then you'd use a for loop instead.

Difference between an If statement and While loop, The if is a conditional statement, a way to make decisions based on some condition. As soon as the condition specified evaluates to TRUE, the statement(s) � A while loop will run as many times as it needs to while a condition is true, i.e., until that condition is false. An if statement will execute once if a condition is true. A great way to understand concepts like this when you're just learning a language is to try them out:

A while loop will run as many times as it needs to while a condition is true, i.e., until that condition is false.

An if statement will execute once if a condition is true.

A great way to understand concepts like this when you're just learning a language is to try them out:

<?php
$i = 1;
while ($i <= 10) {
    echo $i++;
}

echo "\n";

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

This results in:

12345678910
1

WHat is the difference between an if and a while loop?, Difference between if statement, while and for loop? Hello, I know I'm asking a stupid question but I'm kinda confused. I know that the if statement� There is a minor difference between the working of while and do-while loops. The difference is the place where the condition is tested. The while tests the condition before executing any of the statements within the while loop. As against this the do-while tests the condition after having executed the statements within the loop. for e.g.

if command is only run in one condition in one time and its execute in only one statement in one time

while loop is manly use in infinite time for looping a statement while is executed in many statement in one time

Difference between if statement, while and for loop?, Probably the most common type of loop, for loops, are great for when you This is an example of a do…while statement, however, it works� If an "if" statement's condition is not met, the code skips to the next instruction. If a "while" statement's condition is not met, the code stays inside the while loop until the condition is met.

Here's an example:

Suppose you want a script that loops through an array and make one beep sound for each element of the array.

A WHILE loop would generate no beeps for an empty array.

An FOR loop will always run at least once, so an empty array would generate one beep.

The Difference Between For Loops and While Loops in JavaScript , The benefits of a while loop is that it will continue to check the conditional and continue to do the body of the statement until the while is no longer� Difference between For and While Loop Basics. The for loop is quite similar to the while loop in terms of memory consumption and speed. However, the for loop Syntax. Here, Expression 1 = Initialization statement; Expression 2 = Condition for a looping; and Expression 3 = Update Use. It is an

what's the main difference between "if" and "while"?, If an "if" statement's condition is not met, the code skips to the next instruction. If a "while" statement's condition is not met, the code stays inside� Key Differences Between for and while loop In for loop, initialization, condition checking, and increment or decrement of iteration variable is done explicitly in When we are aware of the number of iterations that has to occur in an execution of a loop, then we use for loop. On the If you fail

Difference between while loop and if statement, The usage pretty much follows the English meaning. if is for comparison. if a condition is true, execute a statement or a compound statement in� Both are the difference from each other, if we talk about the main difference then the main difference between while loop and do-while loop is that while loop is a condition that appears at the start of the loop whereas Do-while is a condition that appears at the end of the loop. While loop and do-while loop are used in iteration statements.

If, For, While, Loops--What's the difference?, What is the difference between a while loop and an if statement? Learn Python at https Duration: 5:57 Posted: Aug 8, 2016 Key Differences Between while and do-while Loop The while loop checks the condition at the starting of the loop and if the condition is satisfied statement inside the If the condition in a while loop is false, not a single statement inside the loop is executed. In contrast, if the The while

Comments
  • Why not try it and see?
  • don't over think it. what does if mean in the real world? a one-time decision. same in PHP. make a decision once, move onwards. what does while mean in the real world? "until some condition becomes satisified, continue doing this..." same in PHP.
  • Oh I get it now.. when is the while loop is basically important? I mean I can't find any useful usages with it.
  • @Jony While loops are best used when you don't know exactly how many times you may have to loop through a condition - if you know exactly how many times you want to test a condition (e.g. 10), then you'd use a for loop instead.
  • When you want to keep doing something until a condition is met - for example, reading results from a database query.
  • Please include relevant code samples in the answer itself, rather than linking to external content.
  • This doesn't answer the question. FOR loops aren't mentioned. Can you explain how a WHILE loop differs from an IF statement.