How to replace ID number with asterisk in php

In PHP, you can use the substr_replace() function to replace the ID number with an asterisk. The syntax is "substr_replace(ID number string, asterisk string, starting replacement position, replacement string) length);", where the "length of the replacement string" must be the same as the length of the "asterisk string".

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

php implements ID card Method of replacing numbers with asterisks

In PHP, we can use the substr_replace() function to replace asterisks with ID numbers. The substr_replace() function replaces part of a string with another a string.

The syntax of the substr_replace() function is:

substr_replace(string,replacement,start,length)

It should be noted that:

• The string parameter is required and indicates the regulations The string to be checked; the replacement parameter is also required and specifies the string to be inserted.

• # The start parameter is required and specifies where to start replacement in the string.

  Positive number - Replace starting at the specified position in the string

  Negative number - Replace starting at the specified position from the end of the string

  0 - Replace at the specified position in the string Start replacing at one character

• #The length parameter is optional and 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 - represents the number of characters from the end of the substring to be replaced to the end of string.

  0 - Insert instead of replace

The example is as follows:

<?php
$str = "341234567891236439";
$xing =&#39;**************&#39;;
$xing2 =&#39;************&#39;;
echo substr_replace($str,$xing,0,14);//保留后4位
echo &#39;<br/>&#39;;
echo substr_replace($str,$xing2,2,12)//保留前2位和后4位
?>

Output result:

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