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String replacement is a data processing method often used in the development process. Below we will introduce to you the replacement method of character creation in php.
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Related functions are as follows:
substr_replace(): Replace part of a string with another string
str_replace(): Use a String replaces other characters in the string
substr_replace()
substr_replace() function is used to replace part of the string with Another string, returned as a mixed type.
Syntax:
mix substr_replace ( mixed string, string replacement, int start [, int length] )
Parameter description is as follows:
| Parameters | Description |
|---|---|
| string | The string to be processed |
| replacement | The string to be inserted |
| start | The starting position of the string, the starting position is 0, if it is negative, it starts from the specified position at the end of the string |
| length | Optional, the length returned by the string, the default is until the end of the string, if it is negative, it will be returned from the end of the string |
Example :
<?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 ?>
Tips
If start is a negative number and length is less than or equal to start, length is 0.
str_replace()
The str_replace() function uses one string to replace other characters in the string and returns a mixed type.
Syntax:
mixed str_replace( mixed search, mixed replace, mixed string [, int &count] )
Parameter description is as follows:
| Parameter | Description |
|---|---|
| search | The string to be found (replaced) |
| replace | String to replace search |
| string | String to be processed |
| count | Optional, a variable that counts substitutions |
<?php
echo str_replace("world","earth","Hello world!"); //输出 Hello earth!
//替换多个，且第二个参数为空字符
echo str_replace("o","","Hello world!"); //输出 Hell wrld!
//使用数组
$arr = array("e", "o");
$arr2 = array("x", "y");
echo str_replace($arr, $arr2, "Hello World of PHP", $i); //输出 Hxlly Wyrld yf PHP
echo $i; //输出4
?>
Prompt
This The difference between the function and substr_replace() is that all those that meet the conditions are replaced. This function is case-sensitive. For case-insensitive search and replace, use str_ireplace()The above is the detailed content of php string replacement method. For more information, please follow other related articles on the PHP Chinese website!