PHP substr_replace() function syntax and parameters_PHP tutorial

PHP substr_replace() function syntax

substr_replace(string,replacement,start,length)

Parameters

Description

string

Required. Specifies the string to check.

replacement

Required. Specifies the string to be inserted.

start

参数	描述
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 - 在第 start 个偏移量开始替换 负数 - 在从字符串结尾的第 start 个偏移量开始替换 0 - 在字符串中的第一个字符处开始替换
charlist	可选。规定要替换多少个字符。 正数 - 被替换的字符串长度 负数 - 从字符串末端开始的被替换字符数 0 - 插入而非替换

Required. Specifies where in the string to begin replacement.

• Positive number - start replacement at start offset
• Negative number - replace at start offset from the end of the string
• 0 - Start replacement at the first character in the string

charlist

Optional. Specifies how many characters to replace.

• Positive number - the length of the string to be replaced
• Negative number - the number of characters to be replaced starting from the end of the string
• 0 - insert instead of replace

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PHP substr_replace() Function syntax substr_replace(string,replacement,start,length) Parameter description string required. Specifies the string to check. replacement required. Specifies what to insert...