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;

while(条件)
{
要执行的代码;
}

The while loop effect diagram is as follows:

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++;
}
?>

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 syntax structure is as follows:

do
{
要执行的代码;
}
while (条件);

do while loop) The code is as follows:

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

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