


The example in this article describes the method of inserting substrings into PHP strings. Share it with everyone for your reference, the details are as follows:
First, let’s take a look at a common method online:
Method 1: String traversal
function str_insert($str, $i, $substr) { for($j=0; $j<$i; $j++){ $startstr .= $str[$j]; } for ($j=$i; $j<strlen($str); $j++){ $laststr .= $str[$j]; } $str = ($startstr . $substr . $laststr); return $str; } $str="1234567890"; $sstr="new_word"; echo str_insert($str,5,$sstr);//输出:12345new_word67890
The above method uses string traversal and reorganization to implement the substring insertion function.
Let’s take a look at an improvement method given by Script House:
Method 2: Use the substr function to intercept and combine
function str_insert2($str,$i,$substr){//方法二:substr函数进行截取 $start=substr($str,0,$i); $end=substr($str,$i); $str = ($start . $substr . $end); return $str; //return substr($str,0,$i).$substr.substr($str,$i);//上述代码可综合成这一句 } $str="1234567890"; $sstr="new_word"; echo str_insert2($str,5,$sstr);//输出:12345new_word67890
This method directly uses the substr function to intercept the string, and then assemble the string to achieve the insertion effect of the substring.
Finally, Script House provides you with the most direct method:
Method 3: Directly use the substr_replace function to insert substrings
echo substr_replace($str,$sstr,5,0); //此处直接输出:12345new_word67890
Readers who are interested in more PHP-related content can check out the special topics of this site: "Complete PHP Array (Array) Operation Skills", "PHP Data Structure and Algorithm Tutorial" , "Summary of PHP mathematical operation skills", "Summary of PHP date and time usage", "php object-oriented programming introductory tutorial", " Summary of php string (string) usage ", "php mysql database operation introductory tutorial " and "Summary of common php database operation skills "
I hope this article will be helpful to everyone in PHP programming.

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。

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。


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