irreplacable PHP's substr_replace replaces the characters between the specified two positions with symbols-PHP Tutorial-php.cn

irreplacable PHP's substr_replace replaces the characters between the specified two positions with symbols

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Release： 2016-07-29 08:45:07

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Copy the code The code is as follows:

$username = "zongzi";
echo substr_replace($username,'**','1','2');

Definition and usage

The substr_replace() function replaces part of a string with another string.

Syntax

substr_replace(string,replacement,start,length)

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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 - start replacing at offset start Negative number - start replacing at startth offset from the end of the string 0 - Start replacing 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

Tips and Notes

Note: If start is negative and length is less than or equal to start, then length is 0.
Example

Copy code The code is as follows:

echo substr_replace("Hello world","earth",6);
?>

Output:
Hello earth

The above introduces the irreplacable substr_replace of PHP to replace the characters between the specified two positions with numbers, including the irreplacable content. I hope it will be helpful to friends who are interested in PHP tutorials.