PHP string replacement

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substr_replace(string,replacement,start,length)

The first parameter is: the string to be replaced (required)

The second parameter is: the string to be replaced (required)

The third parameter is: the position to start replacing (required)

Positive number - start replacing negative number at the specified position in the string
- Replace

starting at the specified position from the end of the string. - Replace

starting at the first character in the string. The fourth parameter: specifies how many characters to replace. Characters (optional)

Positive number - the length of the string to be replaced
Negative number - indicates the number of characters from the end of the string to the end of the substring to be replaced.

0 - Insert rather than replace

Example:

$str = '220282198801011234';
$new_str = substr_replace($str,'********',6,8);
print_r($new_str);

Print as follows ：

220282******1234

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