How to use arrays to implement queues and stacks in PHP? PHP uses arrays to implement queues and stacks

How to use arrays to implement queues and stacks in PHP? First, let's take a look. Stacks and queues are two implementation forms of data structures and are very widely used containers for storing data. So, let’s take a closer look at how PHP arrays implement queues and stacks.

1. PHP uses arrays to implement stacks:

1. In the stack container, the last entry is the first to pop out of the stack, the so-called "first in, last out" data structure .

2. In PHP, treat an array as a stack. You can use the array_push() function or "$array[]=$value" to complete the push operation, and use the array_pop() function to complete the pop operation. Data is added or deleted at the end of the function.

3. Example of pushing an array onto the stack:

<?php
      $mypara = array("para1");
      echo(array_push($mypara,"para2"));    //添加一个数据到mypara数组
      print_r($mypara);
 
      $mypara1=array("a"=>"para11","b"=>"para12");
      echo array_push($mypara1,"para13","para14");
       print_r($mypara1);    //Array([a] => para11 [b] => para12 [0] => para13 [2] => para14)
 
      $mypara1["c"] = "para15";   //以“$array[]=$value”形式添加
      print_r ($mypara1);  //Array([a] => para11 [b] => para12 [0] => para13 [2] => para14 [c] => para15)
?>

4. Example of popping an array into the stack:

<?php
     $mypara = array("para1","para2","para3","para4");
     echo array_pop($mypara);  //将最后的元素返回被删除的值弹出，输出PHP
    print_r($mypara);  //Array([0] => para1 [1]=>para2 [2]=>para3)
?>

2. PHP uses arrays to implement queues:

1. In the data structure, queues and stacks are different and follow the "first in, first out" principle.

2. For example: Just like queuing up to handle business at the bank, the person in front of the line handles the business and can leave after completing the process.

3. In PHP, treat the array as a queue. You can use the array_push() function or "$array[]=$value" to complete the data adding operation, and use the array_shift() function to complete the data deletion operation. Removes the first element from the array and returns the value of the removed element.

4. Example of deleting queue data from array:

<?php
     $mypara = array("a"=>"para1","b"=>"para2","c"=>"para3");
     echo array_shift($mypara);
      print_r($mypara);
?>

5. Note: PHP also provides another method to insert one or more elements from the beginning of the queue array. If the function is successfully executed, the insertion will be returned. The number of elements, the format is the same as the function array_push(). That is, you can use the array_unshift() function and array_shift() function to perform queue operations.

Recommended related articles:

PHP uses two stacks to implement queue functions

Recommended related courses:

Use arrays to implement queue operations: array_shift() and array_unshift() functions

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