How to use while loop statement in php

The method of using the while loop statement in php is: the while loop statement executes the code block when the specified condition is true. While loop statement syntax: [while (condition is true) {code to be executed;}], specific code such as: [while($x<5){echo $x; $x;}].

#When we write code, we often need to run the same code block repeatedly. Instead of adding several nearly equal lines of code to the script, we can use a loop to perform such a task.

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The while loop executes the code block when the specified condition is true.

In PHP, we have the following loop statement:

• while - As long as the specified condition is true, the loop code block

• do...while - Execute the code block once first, and then repeat the loop as long as the specified condition is true

• for - Loop the code block a specified number of times

• foreach - Iterate through each element in the array and loop the code block

Let’s take a look at the code example:

PHP while loop

The while loop executes the block of code as long as the specified condition is true.

Syntax

while (条件为真) {
  要执行的代码;
}

The following example first sets the variable $x to 1 ($x=1). The while loop is then executed as long as $x is less than or equal to 5. Each time the loop runs, $x will be incremented by 1:

Instance

<?php 
$x=1; 
while($x<=5) {
  echo "这个数字是：$x <br>";
  $x++;
} 
?>

do...while

The loop will first execute the code block once, The condition is then checked and if the specified condition is true, the loop is repeated.

Syntax

do {
  要执行的代码;
} while (条件为真);

The following example first sets the variable $x to 1 ($x=1). Then, the do while loop outputs a string and then increments the variable $x by 1. The condition is then checked (whether $x is less than or equal to 5). As long as $x is less than or equal to 5, the loop will continue to run:

Example

<?php 
$x=1; 
do {
  echo "这个数字是：$x <br>";
  $x++;
} while ($x<=5);
?>

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