如何在不使用任何功能的情况下用星号替换字符串的前3个字符? [英] How to replace first and last 3 characters of a string with asterisk without using any functions?

问题描述

我想用*符号替换前3个字符和后3个字符，而无需使用任何内置函数.

I want to replace the first 3 characters and last 3 characters with * sign without using any built in functions.

$string = array("johndoee","shawnmarsh","peterparker","johndoee","shawnmarsh","peterparker");

你能指导我吗?有什么办法吗?

Can you guide me? Is there any way to do this?

推荐答案

这似乎毫无意义，但是可以使用

This seems fairly pointless, but it's possible using string access and modification by character.

foreach ($strings as &$string) {
    for ($i=0; $i < 3; $i++) {
        $string[$i] = '*';
        $string[-($i+1)] = '*';
    }
}

请注意，如果字符串包含多字节字符，此不会正常工作，因为它以字节数组的形式访问字符串.

Note that this won't work properly if the string contains multibyte characters, because it's accessing the string as a byte array.

还请注意，这需要PHP 7.1才能使用负索引.如果您没有PHP 7.1，我将不知道一种无需使用任何功能即可替换最后三个字符的方法.

Also note that this requires PHP 7.1 in order to use the negative indexes. If you don't have PHP 7.1 I don't know of a way to replace the last three characters without using any functions.

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