In the previous article "Using the Pearl Algorithm to Sort PHP Arrays", I introduced you to sorting arrays through the Pearl Algorithm. This article continues to introduce you to a little knowledge point~
Suppose there is such a problem: Please write a PHP function that returns the smallest integer that is not 0.
Do you have any simple ideas for this problem?
In fact, everyone should know that there is a built-in function min() in PHP, which is used to return the minimum value in an array, or the minimum value among several specified values.
So how do we create a PHP function to get the smallest integer that returns not 0?
Let’s introduce the specific implementation steps to you:
First create a PHP sample file demo.php;
Then customize a min_values_not_zeroh
Function;
The complete code is as follows:
<?php function min_values_not_zero(Array $values) { return min(array_diff(array_map('intval', $values), array(0))); } print_r(min_values_not_zero(array(-1,0,1,12,-100,1))."\n");
Here is a sample array "-1,0,1,12,-100,1", let us take a look at this set What is the smallest integer that the data returns is not 0?
The results are as follows:
As shown in the figure, the smallest integer is -100.
It’s very simple.
Note:
array_map()
Function: Apply the callback function to each element of the array. The return value is an array, including the array after the callback function is processed (there are multiple For arrays, arrays) corresponds to indexing all elements as parameters of the function. When only an array is passed in, the returned array retains the keys of the passed parameters. When passing in multiple arrays, the returned array keys are sequential integers.
array_diff()
Function: Used to compare the values of two (or more) arrays and return the difference set. This function compares the values of two (or more) arrays (value in key=>value) and returns a difference array that includes all the values in the compared array (array1) but not in any Values in other parameter arrays (array2 or array3, etc.).
Finally, I would like to recommend to you the latest free course on our platform "Entering the World of PHP from 0"~ Come and learn!
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php把负数转为正整数的方法:1、使用abs()函数将负数转为正数,使用intval()函数对正数取整,转为正整数,语法“intval(abs($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。

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。

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,可以使用substr()函数来读取字符串后几个字符,只需要将该函数的第二个参数设置为负值,第三个参数省略即可;语法为“substr(字符串,-n)”,表示读取从字符串结尾处向前数第n个字符开始,直到字符串结尾的全部字符。


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