


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) ?>
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) ?>
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 thearray_push() function or "
$array[]=$value" to complete adding data. Operation, use the
array_shift() function to complete the data deletion operation.
<?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 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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The above is the detailed content of Example sharing of stack and queue functions implemented in PHP based on arrays. For more information, please follow other related articles on the PHP Chinese website!

php把负数转为正整数的方法:1、使用abs()函数将负数转为正数,使用intval()函数对正数取整,转为正整数,语法“intval(abs($number))”;2、利用“~”位运算符将负数取反加一,语法“~$number + 1”。

实现方法:1、使用“sleep(延迟秒数)”语句,可延迟执行函数若干秒;2、使用“time_nanosleep(延迟秒数,延迟纳秒数)”语句,可延迟执行函数若干秒和纳秒;3、使用“time_sleep_until(time()+7)”语句。

php除以100保留两位小数的方法:1、利用“/”运算符进行除法运算,语法“数值 / 100”;2、使用“number_format(除法结果, 2)”或“sprintf("%.2f",除法结果)”语句进行四舍五入的处理值,并保留两位小数。

判断方法:1、使用“strtotime("年-月-日")”语句将给定的年月日转换为时间戳格式;2、用“date("z",时间戳)+1”语句计算指定时间戳是一年的第几天。date()返回的天数是从0开始计算的,因此真实天数需要在此基础上加1。

php判断有没有小数点的方法:1、使用“strpos(数字字符串,'.')”语法,如果返回小数点在字符串中第一次出现的位置,则有小数点;2、使用“strrpos(数字字符串,'.')”语句,如果返回小数点在字符串中最后一次出现的位置,则有。

方法:1、用“str_replace(" ","其他字符",$str)”语句,可将nbsp符替换为其他字符;2、用“preg_replace("/(\s|\ \;||\xc2\xa0)/","其他字符",$str)”语句。

在PHP中,可以利用implode()函数的第一个参数来设置没有分隔符,该函数的第一个参数用于规定数组元素之间放置的内容,默认是空字符串,也可将第一个参数设置为空,语法为“implode(数组)”或者“implode("",数组)”。

php字符串有下标。在PHP中,下标不仅可以应用于数组和对象,还可应用于字符串,利用字符串的下标和中括号“[]”可以访问指定索引位置的字符,并对该字符进行读写,语法“字符串名[下标值]”;字符串的下标值(索引值)只能是整数类型,起始值为0。


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