Usage of substr_replace function in php: [substr_replace(string,replacement,start,length)]. The substr_replace() function is used to replace part of a string with another string.
php The substr_replace function is used to replace a certain string in a string with another string. Its syntax is substr_replace(string,replacement,start,length).
(Recommended tutorial: php video tutorial)
How to use the php substr_replace function?
Function: Replace a certain string in a string with another string.
Syntax:
substr_replace(string,replacement,start,length)
Parameters:
string Required. Specifies the string to check.
replacement Required. Specifies the string to be inserted.
start Required. Specifies where in the string to begin replacement. Positive number - starts replacement at the specified position in the string, negative number - starts replacement at the specified position from the end of the string, 0 - starts replacement at the first character in the string.
length Optional. Specifies how many characters to replace. The default is the same as the string length. Positive number - the length of the string to be replaced, negative number - the number of characters from the end of the string to be replaced from the end of the substring to be replaced. 0 - Insert instead of replace
Description:
Replace part of a string with another string. If the start argument is negative and length is less than or equal to start, length is 0. This function is binary safe.
php substr_replace() function usage example 1
<?php echo substr_replace("Hello world","php.cn",6); ?>
Output:
Hello php.cn
php substr_replace() function usage example 2
<?php $i = "i like JavaScript"; echo substr_replace($i,"php",7); ?>
Output:
i like php
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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。

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。

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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