How to use PHP while loop? (with detailed explanation)

The previous article introduced you to "What are the methods for sorting arrays in PHP? 》, this article continues to introduce PHP while loop to you, it has certain reference value, friends in need can refer to it, I hope it will be helpful to everyone.

About PHP loops, (when encountering cumbersome programs and need to run the same operation again and again, we can use loop statements)

In PHP, the following loop statements are provided:

• while - As long as the specified condition is true, the code block will be executed in a loop
  

• do...while - First execute the block of code once, then repeat the loop when the specified condition is true
  

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

• foreach - loops a block of code over each element in the array
  

# #What is a while loop: A while loop repeatedly executes a code block until the specified condition is not true;

Loops to execute the code block a specified number of times, or when the specified condition is true. code block.

The syntax structure is as follows:

while(条件)
{
要执行的代码;
}

The while loop effect diagram is as follows:

The following about

php whileIn the loop example, we first randomly input the value of a variable will increase (1);

(

while loop) The code is as follows:

<?php
$x=1;
while ($x <= 10) {
    echo "The number is" . $x ."<br>";
    $x++;
}
?>

The running results are as follows:

do...while statement : The do...while statement executes the code at least once, then checks the condition, and repeats the loop as long as the condition is true.

The do while loop flow chart is as follows:

The syntax structure is as follows:

do
{
要执行的代码;
}
while (条件);

In the following example of the php dowhile loop statement, first set the value of variable x to 1 ($i=1;). Then, start the do...while loop. The loop increments the value of variable x by 1 and then prints the output. First check the condition (x is less than or equal to 10), as long as x is less than or equal to 10, the loop will continue to run:

(

do while loop) The code is as follows:

<?php
$x=1;
do
  {
  $x++;
  echo "The number is " . $x . "<br>";
  }
while ($x<=10);
?>

The running results are as follows:

Recommended learning: "

PHP Video Tutorial"

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