php substr_replace函数用于替换字符串中某串为另一个字符串，其语法是substr_replace(string,replacement,start,length)。
php substr_replace函数怎么用？
作用：替换字符串中某串为另一个字符串。
语法：
substr_replace(string,replacement,start,length)
参数：
string 必需。规定要检查的字符串。
replacement 必需。规定要插入的字符串。
start 必需。规定在字符串的何处开始替换。正数 – 在字符串中的指定位置开始替换，负数 – 在从字符串结尾的指定位置开始替换，0 – 在字符串中的第一个字符处开始替换。
length 可选。规定要替换多少个字符。默认是与字符串长度相同。正数 – 被替换的字符串长度，负数 – 表示待替换的子字符串结尾处距离 string 末端的字符个数。0 – 插入而非替换
说明：
把字符串的一部分替换为另一个字符串。如果 start 参数是负数且 length 小于或者等于 start，则 length 为 0。该函数是二进制安全的。
php substr_replace()函数使用示例1
<?phpecho substr_replace("Hello world","php.cn",6);?>
输出：
Hello php.cn
php substr_replace()函数使用示例2
<?php$i = "i like JavaScript";echo substr_replace($i,"php",7);?>
输出：
i like php
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