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The substr_replace() function replaces a part of a string with another string.
substr_replace()函数的作用是:替换字符串中一部分为另一字符串。
substr_replace(string,replacement,start,length) |
Parameter参数 | Description描述 |
---|---|
string | Required. Specifies the string to check 必要参数。指定字符串对象 |
replacement | Required. Specifies the string to insert 必要参数。指定插入的字符串 |
start | Required. Specifies where to start replacing in the string 必要参数。指定开始返回字符串的位置
|
length | Optional. Specifies how many characters should be replaced. Default is the same length as the string. 可选参数。指定返回的字符串长度。默认值是整个字符串
|
Note: If start is a negative number and length is less than or equal to start, length becomes 0.
注意:如果上述的start参数设置为负数,而length参数数值小于或等于start数值,那么length的值自动为0。
<?php echo substr_replace("Hello world","earth",6); ?> |
The output of the code above will be:
上述代码将输出下面的结果:
Hello earth |