Complete Guide and Tutorials for PHP Looping with example

What is Loop?

A Loop is an Iterative Control Structure which requires a number of times until a given condition is met to perform the same number of codes. Sometimes when you write code, you would like a number of times the block of code to run repeatedly. So, we can use loops rather than applying almost identical code lines to a script.

What are the Different types of Loops?

Loops are used again and again to run the same block of code, provided a certain requirement is fulfilled. The fundamental concept behind a loop is to simplify repeated processes in a programmer so as to save time and effort. Four separate loop styles are supported by PHP.

• while – Loops through a code block as long as the given condition is true.
• do...while – The code block running once and then is tested. State. If the condition is true, the declaration shall be repeated until the condition stated is true.
• for – Loops via a code block before a given number is reached in the counter.
• foreach – Loops for each unit of an array across a block of code.

What is While Loops?

The (while) assertion cycles around a block of code as long as the (while) statement’s condition evaluates to true. They are used to continuously execute a block of code before the set condition is met.

When to use While Loops?

• (While loops) are used to run a block of code before a certain condition is met.
• A while loop can be used to read records returned from a database query.

How While Loops works?

Example1:-

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Example2:-

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What is Do….While Loops?

The (do-while loop) is a while loop variant in which the state is evaluated at the conclusion of each loop iteration. A (do-while loop) executes a block of code once, then evaluates the condition; if the condition is true, the expression is repeated as long as the given condition is true.

How Do….While Loops works?

Example:-

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Difference Between While and Do…While Loop

The (while loop) differs from the do-while loop in one crucial way: for a (while loop), the condition to be evaluated is checked at the start of each loop iteration, so the loop can never be executed if the conditional expression evaluates to null.

Since the condition is checked at the conclusion of the loop iteration rather than at the beginning, a (do-while loop) will only be executed once, even though the conditional expression is false.

What is For Loops?

The For loop is a control structure that repeats a block of code as long as a condition is satisfied. It’s usually used to repeat a block of code a certain number of times. If the number of iterations is specified, it should be used; otherwise, a while loop should be used. When you already know how many times you want to run a block of code, you use for loop. It helps users to centralise all loop-related comments.

The for loop in PHP is similar to the for loop in Java/C/C++. The following are the definitions of the (for loop) parameters:

• initialization – It’s used to set the counter variables, and it’s checked once unconditionally before the loop’s body is executed.
• condition – State is assessed at the start of each iteration. The loop persists if it evaluates to true, and the nested statements are executed. If it evaluates to false, the loop is terminated.
• increment – It adds a new value to the loop counter. At the completion of each iteration, it is evaluated.

How For Loops works?

Example1:-

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Example1:-

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What is Foreach Loops?

To loop through arrays, use the Foreach Loops. The current array element’s value is allocated to $value in each pass, the array pointer is shifted by one, and the next element is processed in the next pass. Only arrays are supported by the Foreach loop, which is used to loop around each key/value pair in an array.

Here are some of the Foreach Loops:-

• “foreach(…){…}” is the foreach php loop block code
• “$array_data” is the array variable to be looped through
• “$array_value “ is the temporary variable that holds the current array item values.
• “block of code…” is the piece of code that operates on the array values

How Foreach Loops works?

Example1:-

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Example2:-

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What is Break statement?

The PHP split keyword is used to prematurely end a loop’s execution. Inside the statement block, the break statement is located. It gives you complete freedom and allows you to leave the loop at any time. Since exiting a loop, the loop’s immediate declaration is executed. You may also use the (break) expression to exit a loop or a (switch) statement.

How Break statement works?

Example:-

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What is Continue statement?

The PHP (continue) keyword is used to stop a loop’s current iteration but not to end it. The (continue) declaration, like the split statement, is located within the statement block containing the loop’s code, which is followed by a conditional test. The remainder of the loop code is skipped for the pass that encounters the (continue) expression, and the next pass begins.

How Continue statement works?

Example1:-

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When Break and Continue in While Loop?

You can also use break and continue in while loops:

Break While Loop Example:-

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Continue While Loop Example:-

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Why to Use Loops?

It can be tedious to retype or copy and paste the same code over and over again while trying to replicate code. Worse, inadvertent typos may result in software errors.

That’s a lot of keystrokes! What if you later decide you want to add “The count is currently: ” to the beginning of each statement? You’d have to copy and paste it into each and every line.

Fortunately, most programming languages have a function called loops that allows you to automatically replay code before those conditions are met. Iteration is a term used to describe the repetition of code, and each time the code is performed is called an iteration. Loops will help you minimize the amount of lines of code you write while still making it easy to change later.

PHP is no different, and it has a number of options for repeating the execution of a code block.

This Article has cover the following PHP loop types:

• while
• do … while
• for
• foreach

Any of these loops has conditions for preventing the loop from running. An endless loop will result if these conditions are not implemented correctly, and the programme can never stop executing the code block.

How to use loops in PHP?

A proper knowledge of loops and how to use them efficiently in programming is a fundamental skill that any programmer must master in order to write effective code.

In writing codes, we always have to reproduce a similar series of functions. Performing them one at a time would increase the number of lines of code and the amount of time it takes. As a result, the software becomes more complicated. As a result, we can use loops to execute the code instead!

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