Detailed explanation of the steps for specifying the number of iterations using function static variables in PHP

This time I bring you PHPUsing functionsstaticDetailed explanation of the steps to specify the number of iterations using variables, PHP uses function static variables to implement the specified number of iterationsNotesWhat are they? Here are actual cases. Let’s take a look.

In PHP, in addition to the static membersproperties of the class, static can also be used to define static variables in functions. This makes it easy to complete function iteration.

Example 1:

<?php
function Test()
{
  $a = 0;
  echo $a;
  $a++;
}
?>

In the above example, every time the Test function is called, a is reassigned to 0, because once the function exits, the variable a is is reassigned to 0, because the variable a no longer exists once this function is exited. To complete the iteration, you need to write a counting function that will not lose the current count value. The variable $a must be defined as static:

<?php
function test()
{
  static $a = 0;
  echo $a;
  $a++;
}
?>

In this way, $a is only assigned the value when it is called for the first time, and then Incremented by 1 on each call and will not be overridden.

In this way, you can use this feature to iterate a specified number of times for an operation:

Example 2: (Get a certain array to pop up 5 The result after the element)

$arr = range(1,10,1);
function test($arr)
{
  static $count=0;
  array_pop($arr);
  $count++;
  if ($count < 5) {
    test($arr);
  }else{
    var_dump($arr);exit;
  }
}
test($arr);

Running result:

array(5) {
 [0]=>
 int(1)
 [1]=>
 int(2)
 [2]=>
 int(3)
 [3]=>
 int(4)
 [4]=>
 int(5)
}

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the PHP Chinese website!

Recommended reading:

Detailed explanation of the steps to implement single sign-on with PHP

The steps to implement real-time message push in PHP based on anti-ajax push Detailed explanation

The above is the detailed content of Detailed explanation of the steps for specifying the number of iterations using function static variables in PHP. For more information, please follow other related articles on the PHP Chinese website!