


Two ways to remove leading and trailing spaces in php, 2 ways of removing leading and trailing spaces in php
It seems to be a very simple problem, but it is actually a bit tricky. First of all, space escaping here, It is not a string and cannot be removed directly using trim().
1, replace
with preg_replace
Copy code The code is as follows:
$test = " dfadad On the relationship between the responsible people and the three British 775fd ";
$test = preg_replace('/^( |s)*|( |s)*$/', '', $test);
var_dump($test);
//The results are as follows:
string 'dfadad On the relationship between the responsible people and the three British 775fd' (length=35)
This method was provided by friends in the group, and I would like to express my gratitude. This method is recommended because it is universal
2, trim method
Copy code The code is as follows:
$test = " dfadad 3333adf775fd ";
$test = trim(html_entity_decode($test),chr(0xc2).chr(0xa0));
var_dump($test);
//The results are as follows:
string 'dfadad 3333adf775fd' (length=19)
This method is found in the official manual of PHP. If it is UTF8 encoding, there is no problem in using this method. If GBK, GB2312, garbled characters will appear. There is also json_encode. If this function is gbk or gb2312, Chinese characters will be replaced by null. It is recommended to use utf8 encoding.

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。

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。

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。

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。

查找方法:1、用strpos(),语法“strpos("字符串值","查找子串")+1”;2、用stripos(),语法“strpos("字符串值","查找子串")+1”。因为字符串是从0开始计数的,因此两个函数获取的位置需要进行加1处理。


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