Example
Replace "Hello" with "world":
<?php
echo substr_replace("Hello","world",0);
?>Definition and usage
substr_replace() function replaces the string Replace part of it with another string.
Note: If the start parameter is negative and length is less than or equal to start, length is 0.
Note: This function is binary safe.
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 |
Required. Specifies where in the string to begin replacement.
Positive number - starts at the specified position in the string Negative number - starts at the specified position from the end of the string 0 - Starts 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 to be replaced from the end of the string 0 - Insert instead of replace
|
Technical details
| Return value: |
Return the replaced string. If string is an array, the array is returned. |
| PHP Version: |
4+ |
| ##Update Log :
| As of PHP 4.3.3, all parameters accept arrays. |
更多实例
实例 1
从字符串的第 6 个位置开始替换（把 "world" 替换成 "earth"）：
<?php
echo substr_replace("Hello world","earth",6);
?>实例 2
从字符串结尾的第 5 个位置开始替换（把 "world" 替换成 "earth"）：
<?php
echo substr_replace("Hello world","earth",-5);
?>实例 3
在 "world" 开头插入 "Hello"：
<?php
echo substr_replace("world","Hello ",0,0);
?>实例 4
一次性替换多个字符串。把每个字符串中的 "AAA" 替换成 "BBB"：
<?php
$replace = array("1: AAA","2: AAA","3: AAA");
echo implode("<br>",substr_replace($replace,'BBB',3,3));
?>例子：
<?php
echo substr_replace('abcdef', '###', 1); //输出 a###
echo substr_replace('abcdef', '###', 1, 2); //输出 a###def
echo substr_replace('abcdef', '###', -3, 2); //输出 abc###f
echo substr_replace('abcdef', '###', 1, -2); //输出 a###ef
?>
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