php substr_replace () function syntax
Action: replacement string of a string to another string marble platform Price
语法：substr_replace(string,replacement,start,length)
parameter:
| parameter | description |
| string | essential. Specifies the string to check. |
| replacement | essential. Specifies the string to be inserted. |
| start | essential. Where to begin replacing the provisions of the string. Positive number - Specifies the start position in the string Alternatively, negative - Replace the start end of the string at the specified position, 0 - the first character in the string starts replaced. |
| length | Optional. Specifies how many characters you want to replace. The default is the same as the length of the string. Positive - length of the string to be replaced, a negative - represents a substring at the end of the number of characters to be replaced from the end of the string. 0 - insert rather than replacing |
Description: the replacement string as part of another string. If the start parameter is negative and less than or equal length start, the length is zero. This function is binary safe.