Example sharing of stack and queue functions implemented in PHP based on arrays-PHP Tutorial-php.cn

Example sharing of stack and queue functions implemented in PHP based on arrays

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Release： 2023-03-19 12:46:01

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This article mainly introduces the stack and queue functions of PHP based on arrays, and analyzes PHP's array-based array_push(), array_pop(), array_shift() and other functions based on arrays to implement the stack and queue push and pop functions. Friends in need can refer to the related operation skills such as adding and deleting queues. I hope it can help everyone.

Stacks and queues are two implementation forms of data structures and are very widely used containers for storing data. Next, let’s talk about the applications of these two containers in PHP:

1. Use arrays to implement stacks:

1. In a stack container, the last thing pushed into the stack will be popped out first, which is the so-called "first in, last out" data structure.

2. In PHP, the array is treated as a stack. You can use the array_push() function or "$array[]=$value" to complete the push. Operation, use the array_pop() function to complete the pop operation.

3. The push operation of the stack is equivalent to: putting the data one by one into a bucket-shaped container (assuming that the data and the bucket have an appropriate surface area, that is, it can just fit in horizontally), resulting in That is, after all the data is pushed into the stack, the first one is at the bottom.

4. 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)
?>

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5. Example of popping an array from 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)
?>

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2. Use arrays to implement queues:

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

2. Understand the queue example, just like an infusion needle, the liquid that enters the thin tube first enters the human body.

3. In PHP, treat the array as a queue. You can use the

array_push() function or "$array[]=$value" to complete adding data. Operation, use the array_shift() function to complete the data deletion operation.

4. Example of deleting queue data from an array:

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

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5. Note: PHP also provides another method to insert one or more queue data from the beginning of the queue array. element. If this function is successfully executed, it will return the number of inserted elements. The format is the same as the function

array_push(). That is, you can use the array_unshift() function and the array_shift() function to perform queue operations.

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