Our Stage Scores example can be implemented using a For loop as below. In While loops, you have to define the incrementer outside the loop and then increment it inside the loop in a separate statement. sum =7+1 =8. The while loop is generally used when you don't know the number of iterations that are going to take place in a loop. In PHP, we have the following loop types: while - loops through a block of code as long as the specified condition is true do...while - loops through a block of code once, and then repeats the loop as long as the specified condition is true for - loops through a block of code a specified number of times The number of times the block of code should be executed is specified in the Loop so as to exit from the loop. PHP. 125. © 2020 - EDUCBA. Again the condition of the while loop, i.e. PHP while loop can be used to traverse set of code like for loop. $number = 107; { tells PHP to execute the nested statement(s) repeatedly, as long Execution of statements inside the while loop continues until the value of the variable becomes 6. PHP While Loop executes a block of statements in a loop as long as the condition is true. For Loop. Here's an example. The while loop runs as long as the expression (condition) evaluates to True and execute the program block. $value = 10; Now the while loop conditionis checked, i.e. Flowchart of the PHP While LOOP. The idea of a loop is to do something over and over again until the task has been completed. A while loop is a construct that lets you run a block of code repeatedly as long as a certain condition is true. Here we discuss how while loop works in PHP, syntax, flowchart along with different examples and code implementation. While loop is mainly used by the programmer when the iterations are not fixed and we need to execute the set of statements until the main condition evaluates to be true. In the vast majority of cases, it is better to create a PHP daemon. while() will repeat as long as the condition inside it remains true. As we all know that PHP is one of the most widely used languages for web development. The do-while loop is very similar to the while loop, with the only difference being that the while condition is checked at the end of the first iteration. But it won’t be practical and will be more time-consuming. This helps the user to save both time and effort of writing the same code multiple times. Working of while loop in PHP is explained in the below steps: Below are the different examples of while loop in PHP: With a do-while loop the block of code executed once, and then the condition is evaluated, if the condition is true, the statement is repeated as long as … In this tutorial, we will learn how to write a while loop in PHP, and how to use it to implement looping of a task, with example programs. If the condition evaluates to TRUE, the loop body is executed. It is a name associated with the WHILE loop. At the end of the while (list / each) loop the array pointer will be at the end. .. It should be used if the number of iterations is not known. PHP While Loop. PHP Daemon. Number variable becomes 1/10 =0. Then the code is more self-documenting: WHILE NOT FINISHED keep going through the loop. The value of the expression is checked each time at the beginning of the loop, so even if this value changes during the execution of the statement, execution will not stop until the end of … $sum=0; $rem=0; The value of the expression is checked each time at the beginning of the loop, so even if this value changes during the execution of the statement, execution will not stop until the end of … PHP parse/syntax errors; and how to solve them. As I mentioned above, running infinite PHP loops on your web server is not a good idea. Loops in PHP are useful when you want to execute a piece of code repeatedly until a condition evaluates to false. THE CERTIFICATION NAMES ARE THE TRADEMARKS OF THEIR RESPECTIVE OWNERS. If the condition is met, PHP executes the code in the parentheses after the while loop. There is no need to specify the exact number of iterations for which a while loop should run unlike ‘for’ loops. For loops address these facts inside the loop start. END WHILE [ label_name ]; Parameters or Arguments label_name Optional. will not stop until the end of the iteration (each time PHP runs By default, PHP will kill the script if the client disconnects. If the Below given is the basic flowchart expressing the process of how the while loop performs its action. PHP supports four types of looping techniques; The basic form of a while statement is: What is a while loop? As you can see, we told PHP to ignore user disconnects by passing a boolean TRUE value into ignore_user_abort. As the condition evaluates to be true, control will move inside the loop remainder (rem) is calculated (107%10) i.e. At the end of the loop, the test-condition in the while statement is evaluated,so it is categorized as post tested loop.The basic format of do while() statement is: In this tutorial, we will learn how to write a while loop in PHP, and how to use it to implement looping of a task, with example programs. PHP do…while Loop The do-while loop is a variant of while loop, which evaluates the condition at the end of each loop iteration. The statements inside the loop are executed. { 679. Rampuria Jain College , Bikaner . This is a guide to while loop in PHP. the statements in the loop is one iteration). 5, which is true so the st… .. The PHP do...while Loop The do...while loop will always execute the block of code once, it will then check the condition, and repeat the loop while the specified condition is true. while ((int)$value > 5) { PHP Do-While Loop. $mult =1; of a while statement is: The meaning of a while statement is simple. Do-while loops are very similar to while loops, except the condition is checked at the end of the loops instead of in the beginning. changes during the execution of the nested statement(s), execution Syntax: while (if the condition is true) { // code is executed } Once the value becomes 5 and the condition evaluates to be false (5 > 5), the while loop terminates and the echo statement inside the while loop will not execute. PHP LAB WHILE LOOP , S.B.J.S. $mult++; PHP while Loop Statement Last update on February 26 2020 08:09:52 (UTC/GMT +8 hours) Description. { 1<=10 sets to be true and the cursor will move inside the loop and the value of 6 * 1= 6 is printed on the screen. , The value of the field is 10 Mastering Web Technologies. The "While" Loop . Number now becomes 107/10 = 10. School Vellore Institute of Technology; Course Title IS MISC; Uploaded By ColonelManatee87. A "While" Loop is used to repeat a specific block of code an unknown number of times, until a condition is met. PHP while loop executes a block of code again and again until the given condition is true. number variable now becomes 10/10 =1, which is again not equal to 0 and move inside the while loop, so rem variable becomes 1%10 =1. Sometimes a situation arises where we want to exit from a loop immediately without waiting to get back to the conditional statement. statement(s) won't even be run once. PHP while loop Loops are used to execute the same block until the condition is true. This website or its third-party tools use cookies, which are necessary to its functioning and required to achieve the purposes illustrated in the cookie policy. We can use the same code as many times as we want. PHP while loop and do while loop for beginners and professionals with examples, php file, php session, PHP array, PHP form, functions, time, Ajax, PHP MySQL In the above example, the sum of the digits of a number ‘107’ is calculated which is 1+0+7. 7 and is added to the sum variable, which becomes 0+7 =7. Thereafter, it will be executed if the condition is true. as the while expression evaluates to Nested while loop in PHP : While loops execute the statement repeatedly, as long as the while expression evaluates to TRUE. while expression evaluates to now mult =2. After executing that code, PHP returns to the while loop condition and checks to see if the condition is true. PHP while loops execute a block of code while the specified condition is true Then, the while loop will continue to run as long as condition will be true (PHP 4, PHP 5, PHP 7, PHP 8) do-while loops are very similar to while loops, except the truth expression is checked at the end of each iteration instead of in the beginning. The expression in the while loop is the total length of elements by using the count function. Loops are one of the largely and most commonly used while writing any piece of code as their main purpose is to execute the same piece of code repeatedly according to specific requirements of a programmer. So, the while loop will keep on executing until it reaches the maximum length of the array. The basic form Documentation. The condition is checked every time at the beginning of the loop and the first time when the expression evaluates to False, the loop stops without executing any remaining statement(s). Suppose you want to calculate gross salaries of 20 different persons or take a list of maximum and minimum temperatures of a certain month or a year, the while loop is ideal to solve these types of cases. Break in while loop php x while x 10 if x 4 break. While loops tell PHP to execute the nested statement(s) repeatedly, as long as the while expression evaluates to TRUE. echo "The Sum of digits of number given 107 is $sum"; The crucial part of a while() loop is the bit inside while() itself. Syntax of While Loop. As demonstrated in the last section for while loops, you will see how similar the for loop … I find it often clearer to set a simple flag ($finished) to false at the start of the loop, and have the program set it to true when it's finished doing whatever it's trying to do. while − loops through a block of code if and as long as a specified condition is true. for − loops through a block of code a specified number of times. They behave just like their C counterparts. In the above program, the table of the variable, ‘table_number’ is printed. .. The value of the field is 7 Break in While Loop php x while x 10 if x 4 break echo The number is x br x 87. PHP while loop. If the condition evaluates to true, the conditional code is executed. PHP while() Loops: How and Why to Use Them How a while() Loop Thinks. 107 != 0, is checked. The most popular ways to do it usually is with a while, for and foreach operator, but, believe it or not, there are more ways to do it with PHP. using the alternate syntax: The following examples are identical, and both print the numbers false from the very beginning, the nested In any programming language, understanding the basic concepts is very important before diving deep in the advanced ones. multiple statements within the same while loop What does that code do, and how does a PHP while() loop work more broadly? Code: 5) { echo "The value of the field is : $value
"; $value--; } ?> Output: The value of the field is 10 The value of the field is 9 The value of the field is 8 The value of the field is 7 The value of the field is 6 Explanation In the above program, variable with the name ‘value’ is assigned with the value 10. ALL RIGHTS RESERVED. If the condition is satisfied or is true, then the control is moved inside the loop. $table_number= 6; PHP program to display the multiplication table of the given number. The function of the while loop is to do a task over and over as long as the specified conditional statement is true. Using while loop with PHP arrays. This preview shows page 175 - 190 out of 509 pages. It is important to understand the working of loops before using them as partial knowledge of them can sometimes lead to unexpected results. by surrounding a group of statements with curly braces, or by The do...while loop - Loops through a block of code once, and then repeats the loop as long as the specified condition is true. The image above shows how PHP loops or iterates through a while loop. The While Loop The while loop is used to repeat a section of code an unknown number of times until a specific condition is met. For loops address these facts inside the loop start. The keyword break ends execution of the current for, foreach, while, do while or switch structure. Though there are 4 types of loops used in PHP and every loop is used in a particular situation. while loop: The while loop is also an entry control loop like for loops i.e., it first checks the condition at the start of the loop and if its true then it enters the loop and executes the block of statements, and goes on executing it as long as the condition holds true. The value of the expression is checked As soon as the condition becomes false, the loop exits. PHP Do-While Loop Do-while loops are very similar to while loops, except the condition is checked at the end of the loops instead of in the beginning. For Loop. true. 1 through 10: Just a note about using the continue statement to forego the remainder of a loop - be SURE you're not issuing the continue statement from within a SWITCH case - doing so will not continue the while loop, but rather the switch statement itself. while loops are the simplest type of loop in PHP. In While loops, you have to define the incrementer outside the loop and then increment it inside the loop in a separate statement. FINISHED EQUALS TRUE when you're done. The value of variable ‘value’ is decreased by 1 and again checked with the while condition. Our Stage Scores example can be implemented using a For loop as below. For the first time when the value of the ‘mult’ variable is 1, so the condition of while loop, i.e. $sum = $sum + $rem; It For Loop. ?> PHP supports following four loop types. The syntax of PHP while loop is. , The Sum of digits of the number given 107 is 8. echo "The value of the field is : $value
"; Here’s the general syntax of a PHP while loop: while (condition) { // This code is run as long as condition is true } // This code is run after the loop … ?> The process repeats itself and executes the code. In this article, I will walk-through each possibility for reading arrays whilst looping. PHP While Loop executes a block of statements in a loop as long as the condition is true. 10 > 5, which is true so the statements inside the loop will execute. while loops are the simplest type of loop in statements The loop first test the condition if it is true and if the condition is true, it executes the code and returns back to check the condition if it is true. In general, a number whose table needs to be printed remains the same, i.e. The value of the field is 9 2 <=10 is checked and the multiplication table of 6 is printed until the ‘mult’ variable is less than equal to 10. So, the block of code of do-while loops is executed at least one time. Using mysql_fetch_assoc in a while loop with extra condition. PHP Loop: For, ForEach, While, Do While [Example] A Loop is an Iterative Control Structure that involves executing the same number of code a number of times until a certain condition is met. For example, say we want to know how many times a given number can be divided by 2 before it is less than or equal to 1. $rem=$number%10; Now the while loop condition is checked, i.e. You may use the PHP while loop with arrays as well. $number=$number/10; You also look at do...while loops. This is the code I use to generate a random filename and ensure that there is not already an existing file with the same name. Thereafter, it will be executed if the condition is true. The loop first test the condition if it is true and if the condition is true, it executes the code and returns back to check the condition if it is true. First the condition of while loop, i.e. simple pyramid pattern program using while loop, Human Language and Character Encoding Support, « Alternative syntax for control structures, Alternative syntax for control structures. What Is a While Loop in PHP | PHP Tutorial | Learn PHP Programming | PHP for Beginners. Like any other language, loop in PHP is used to execute a statement or a block of statements, multiple times until and unless a specific condition is met. (PHP 4, PHP 5, PHP 7, PHP 8) while loops are the simplest type of loop in PHP. The above explanation clearly describes the syntax of a while loop along with its working in a program. First the condition given inside the brackets after the while keyword is checked. condition Te condition is test each pass through the WHILE loop. .. I've added very verbose comments to it to make it clear how it works: // we're not finished yet (we just started), // (if not finished, re-start WHILE loop), //> while($a++ <= 100000000);   = 18.509671926498s. while((int)$mult<=10) $value--; PHP do while loop tutorial with working examples. The value of the ‘mult’ variable is incremented by 1, i.e. They behave just like their C counterparts. .. Do-While Loop in PHP. echo "$table_number * $mult
"; The PHP while loop is the simplest type of loop to understand. Before we show a real example of when you might need one, let's go over the structure of the PHP while loop. A while loop is a construct that lets you run a block of code repeatedly as long as a certain condition is true. You may also look at the following articles to learn more-. PHP while loop and do while loop for beginners and professionals with examples, php file, php session, PHP array, PHP form, functions, time, Ajax, PHP MySQL Nesting Loops: A nested loop is a loop within a loop, an inner loop within the body of an outer one. PHP while loop executes a block of code again and again until the given condition is true. PHP while loop. Like with the if statement, you can group each time at the beginning of the loop, so even if this value So, the block of code of do-while loops is executed at least one time. Again the number 10 is checked against the while condition which is set to be true and the control will again move inside the loop. while((int)$number != 0) 6 in this case whereas the multiples keep on incrementing from 1 till 10. Rem variable now is 10%10 =0 and sum becomes 7+ 0 = 7 . If is it true, the code in the while loop … As explained above, while loop works until the condition specified is satisfied. When the condition is evaluated to be false, the control will not move inside the loop and the while loop terminates. The while loop executes a block of code repeatedly until the condition is FALSE. Once the condition gets FALSE, it exits from the body of loop. A While Loop Condition In PHP. PHP Node.js Python. nested loops are very useful to perform complex task, it also used to print pattern.PHP… Now the while condition is evaluated to be false so the cursor will not move inside the while loop and the sum final value becomes 8 which is printed on the screen. } While Loops are also quite popular when it comes to reading the records fetched from the database using some query. }. If the condition evaluates to FALSE, the WHILE loop is terminated. The process repeats itself and executes the code. // Set of Statements to be executed PHP, just like most other programming languages has multiple ways to loop through arrays. The value of the field is 6. Loops in PHP are used to execute the same block of code a specified number of times. Once all the statements inside the loop are executed, the condition is checked again and if it is true the execution continues. In this article you look at the syntax of a PHP while loop, and explore some example loops. Nested while loop in PHP : While loops execute the statement repeatedly, as long as the while expression evaluates to TRUE. For example, if we want to ask a user for a number between 1 and 10, we don't know how many times the user may enter a larger number, so we keep asking "while the number is not between 1 and 10". Pages 509. So code is executed repeatedly as long as a condition evaluates to true, and as soon as the condition evaluates to false, the script continues executing the code after the loop.The following flowchart explains how loops work in PHP.As you can see in the above screenshot, a loop contains a condition. Code/statements inside the while loop in PHP execute until the condition specified by the programmer remains ‘true’. Simple While Loop Example. } By closing this banner, scrolling this page, clicking a link or continuing to browse otherwise, you agree to our Privacy Policy, 5 Online Courses | 3 Hands-on Project | 28+ Hours | Verifiable Certificate of Completion | Lifetime Access, Java Servlet Training (6 Courses, 12 Projects), All in One Software Development Bundle (600+ Courses, 50+ projects), Software Development Course - All in One Bundle. PHP do while loop : on reaching the control to do statement, the program proceeds to evaluated the body of the loop first. In this example, an array of five elements is created. The flow of execution in the while Loop is not very complex. } 0. In the above program, variable with the name ‘value’ is assigned with the value 10. Statements inside the while loop will not execute once the condition mentioned in the loop is evaluated to be false. In this example, we will create and display the multiplication Table for the given number (9) using for, while, and do while loops. Introduction to PHP While Loop The Loop is used in any programming language is to run the same lines of code or block of statements multiple times based on the expected output. The value of the field is 8 While Loops can be used at all times where there is a requirement to execute a block of code until the given condition is being satisfied. Below mentioned is the syntax of while loop in PHP: Start Your Free Software Development Course, Web development, programming languages, Software testing & others, while (condition to be true) Once the value of the ‘mult’ variable becomes 11, the cursor will not move inside the loop and the execution of loop terminates. Loop exits of variable ‘ value ’ is assigned with the value of the of... Of a loop is terminated the keyword break ends execution of statements a. 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The PHP while loop in PHP: while loops execute the program proceeds to evaluated the body loop... Php loops or iterates through a while loop is not known used languages for web development CERTIFICATION NAMES are simplest... Be printed remains the same block of code repeatedly as long as the while loop in:. To be false, the loop so as to exit from the loop are executed, table... And every loop is to do a task over and over as long the! The records fetched from the database using some query article you look at the end of the PHP loop... The function of the while loop condition specified by the programmer remains ‘ true ’ might one!